KR102527402B1 - Apparatus and method for switching transmission and reception of signal in wireless communication system - Google Patents

Abstract

In an embodiment of the present invention, a transmitting and receiving apparatus in a communication system is disclosed. The transceiver includes a switch unit including first to third inductors, first and second capacitors, and first and second switches; an antenna connected to the switch unit; a first amplifier connected to the switch unit; a matching network connected to the switch unit; and a second amplifier connected to the matching network. The first capacitor is connected to an output port of the first amplifier.

Description

APPARATUS AND METHOD FOR SWITCHING TRANSMISSION AND RECEPTION OF SIGNAL IN WIRELESS COMMUNICATION SYSTEM

The present invention relates to a wireless communication system, and more particularly, to an apparatus and method for switching signal transmission and reception in a wireless communication system.

In a wireless communication system, a first communication node may transmit a transmission signal to a second communication node using one antenna. Also, the first communication node may receive a reception signal from the second communication node using one antenna. For example, the first communication node may switch a connection between an antenna and a transmission processing unit or a reception processing unit using a switch. Here, the switch is connected to the antenna and may be referred to as a radio frequency (RF) switch.

A first communication node that performs a switching operation for transmitting or receiving a signal using one antenna and a switch may be applied to a wireless communication system using a time division duplexing scheme. In a wireless communication system using time division duplexing, the following three requirements must be satisfied.

First, when the switch of the first communication node connects the antenna to the transmission processing unit or the reception processing unit, insertion loss must be less than a predetermined threshold loss. Second, the degree of isolation between the connection end of the transmission processing unit and the connection end of the reception processing unit connected to the switch must exceed a predetermined threshold isolation degree. That is, separation between a transmission signal and a reception signal must be ensured. Third, the speed of the operation of switching the antenna to the transmission processing unit or the reception processing unit by the switch must exceed a predetermined threshold speed.

An object of the present invention for solving the above problem is to control transmission of a transmission signal and reception of a reception signal through a switching unit of a transmission/reception device.

One embodiment of the present invention for achieving the above object discloses a transceiver in a communication system. The transceiver includes a switch unit including first to third inductors, first and second capacitors, and first and second switches; an antenna connected to the switch unit; a first amplifier connected to the switch unit; a matching network connected to the switch unit; and a second amplifier connected to the matching network. The first capacitor is connected to an output port of the first amplifier. The first inductor is connected in parallel with the capacitor and connected to an output port of the first amplifier. A first end of the second inductor is connected to the antenna. The second terminal of the second inductor is connected to the first terminal of the first switch and the input port of the matching network. The third inductor is connected in parallel with the second switch. A second terminal of the first switch is grounded.

The first switch may be opened in a receiving mode. The second switch may be closed in a reception mode. An impedance value formed at both ends of the second switch may be less than a predetermined critical impedance value.

The antenna may transmit a received signal to the second inductor. The second inductor and the third inductor may generate an induced current according to the received signal. The induced current may change mutual inductance between the first inductor and the second inductor.

The second inductor may transfer the received signal received from the antenna to the matching network. The matching network may transmit the received signal received from the second inductor to the second amplifier. The second amplifier may amplify the received signal.

The first switch may be closed in transmission mode. The second switch may be opened in transmission mode. An impedance value formed at both ends of the second switch may exceed a predetermined critical impedance value.

The first to third inductors may be physically separated. The first to third inductors may be electromagnetically coupled.

The switching unit may include a first end, a second end positioned above the first end, and a third end positioned above the second end. The first inductor may be disposed at the first terminal. The second inductor may be disposed at the second end so as to vertically overlap the first inductor. The third inductor may be disposed at the third end so as to vertically overlap the second inductor.

The second inductor may be wound to surround the outer circumference of the first inductor. The third inductor may be wound to surround an outer periphery of the third inductor.

The antenna may transmit a received signal to the second inductor when the first switch is opened and the second switch is closed.

The first amplifier may transmit an amplified transmission signal to the second inductor when the first switch is closed and the second switch is open.

The transceiver may operate in a transmission mode when the first switch is opened and the second switch is closed.

The transceiver may operate in a reception mode when the first switch is closed and the second switch is open.

Mutual inductance between the first inductor and the second inductor may vary according to the opening and closing of the second switch.

A frequency response characteristic of a transmission signal transmitted from the first amplifier to the antenna may vary according to opening and closing of the second switch.

A frequency response characteristic of a received signal transmitted from the antenna to the second amplifier may vary according to opening and closing of the second switch.

According to an embodiment of the present invention, the transmission/reception device can prevent a transmission signal and a reception signal from being lost within a circuit of the transmission/reception device by using a switch unit.

According to an embodiment of the present invention, a transceiver can prevent mutual interference between a transmitted signal and a received signal by using a switch unit.

According to an embodiment of the present invention, a transceiver can improve transmission performance and reception performance by using a switch unit.

1 is a conceptual diagram illustrating a communication system according to a first embodiment of the present invention.
2 is a conceptual diagram showing the structure of a communication node in a communication system according to a first embodiment of the present invention.
3 is a block diagram showing a transceiver according to a first embodiment of the present invention.
4 is a circuit diagram showing the structure of an RF switch according to a first embodiment of the present invention.
5 is a circuit diagram showing an RF switch according to a second embodiment of the present invention.
6 is a circuit diagram showing an RF switch according to a third embodiment of the present invention.
7 is a circuit diagram showing an RF switch according to a fourth embodiment of the present invention.
8 is a circuit diagram showing an RF switch according to a fifth embodiment of the present invention.
9 is a circuit diagram showing a transceiver including an RF switch according to a fifth embodiment of the present invention.
10A and 10B are graphs illustrating a gain of a transmission signal and a gain of a reception signal according to frequency of a transceiver according to a fifth embodiment of the present invention.
11A and 11B are circuit diagrams showing the structure of a transceiver according to a sixth embodiment of the present invention.
12A and 12B are graphs illustrating gain values according to frequencies of a transmission signal and a reception signal of a transmission/reception apparatus according to a fifth embodiment and a transmission/reception apparatus according to a sixth embodiment of the present invention.

Since the present invention can make various changes and have various embodiments, specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. The terms and/or include any combination of a plurality of related recited items or any of a plurality of related recited items.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in this application, they should not be interpreted in an ideal or excessively formal meaning. don't

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in more detail. In order to facilitate overall understanding in the description of the present invention, the same reference numerals are used for the same components in the drawings, and redundant descriptions of the same components are omitted.

Throughout the specification, a terminal includes a mobile terminal (MT), a mobile station (MS), an advanced mobile station (AMS), and a high reliability mobile station (HR-MS). MS), subscriber station (SS), portable subscriber station (PSS), access terminal (AT), user equipment (UE), etc. , MS, AMS, HR-MS, SS, PSS, AT, UE, etc. may include all or some functions.

In addition, the base station (BS) includes an advanced base station (ABS), a high reliability base station (HR-BS), a node B, and an evolved node B , eNodeB), access point (AP), radio access station (RAS), base transceiver station (BTS), mobile multihop relay (MMR)-BS, repeater serving as a base station ( relay station (RS), a high reliability relay station (HR-RS) serving as a base station, and a small base station. , BTS, MMR-BS, RS, HR-RS, small base stations, etc. may include all or some of the functions.

1 is a conceptual diagram illustrating a communication system according to a first embodiment of the present invention.

Referring to FIG. 1, a communication system 100 includes a plurality of communication nodes 110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6). Each of the plurality of communication nodes may support at least one communication protocol. For example, each of the plurality of communication nodes is a communication protocol based on code division multiple access (CDMA), a communication protocol based on wideband CDMA (WCDMA), a communication protocol based on time division multiple access (TDMA), and a frequency division multiple (FDMA) access) based communication protocol, OFDM (orthogonal frequency division multiplexing) based communication protocol, OFDMA (orthogonal frequency division multiple access) based communication protocol, SC (single carrier)-FDMA based communication protocol, NOMA (non-orthogonal multiple access) access)-based communication protocol, space division multiple access (SDMA)-based communication protocol, and the like may be supported. Each of the plurality of communication nodes may have the following structure.

2 is a conceptual diagram showing the structure of a communication node in a communication system according to a first embodiment of the present invention.

Referring to FIG. 2 , the communication node 200 may include at least one processor 210, a memory 220, and a transceiver 230 connected to a network to perform communication. In addition, the communication node 200 may further include an input interface device 240, an output interface device 250, a storage device 260, and the like. Each component included in the communication node 200 may be connected by a bus 270 to communicate with each other.

However, each component included in the communication node 200 may be connected through an individual interface or an individual bus centered on the processor 210 instead of the common bus 270 . For example, the processor 210 may be connected to at least one of the memory 220, the transmission/reception device 230, the input interface device 240, the output interface device 250, and the storage device 260 through a dedicated interface. .

The processor 210 may execute a program command stored in at least one of the memory 220 and the storage device 260 . The processor 210 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present invention are performed. Each of the memory 220 and the storage device 260 may include at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 220 may include at least one of a read only memory (ROM) and a random access memory (RAM).

Meanwhile, a specific structure of the transceiver 230 may be as shown in FIG. 3 below.

3 is a block diagram showing a transceiver according to a first embodiment of the present invention.

Referring to FIG. 3 , the transceiver 300 includes an antenna 301, an RF switch 302, a low noise amplifier (LNA) 303, a power amplifier (PA) 304, and a transmit/receive signal processing unit 305. can include Here, the transceiver 300 may be the same as or similar to the transceiver 230 of FIG. 2 .

The transceiver 300 may operate according to a reception mode or a transmission mode. For example, in the reception mode, the antenna 301 may receive a signal transmitted through the air. The antenna 301 may transmit the received signal to the RF switch 302 . The RF switch 302 may receive a received signal from the antenna 301 . The RF switch 302 may perform a switching operation to transfer the received signal received from the antenna 301 to the LNA 303. For example, the RF switch 302 may be connected to the LNA 303 through a switching operation. The RF switch 302 connected to the LNA 303 may transmit a received signal to the LNA 303. The LNA 303 may receive a received signal from the RF switch 302. LNA 303 may amplify the received signal. The LNA 303 may transfer the amplified received signal to the transmit/receive signal processing unit 305. The transmit/receive signal processor 305 may receive the amplified received signal from the LNA 303. The transmit/receive signal processing unit 305 may process the amplified received signal.

Meanwhile, in the transmission mode, the transmission/reception signal processor 305 may process transmission signals. The transmit/receive signal processor 305 may transfer the transmit signal to the PA 304. The PA 304 may receive a transmission signal from the transmission/reception signal processor 305 . PA 304 may amplify the transmit signal. At this time, the RF switch 302 may perform a switching operation to transfer the amplified transmission signal from the PA 304 to the antenna 301. For example, the RF switch 302 may be connected to the PA 304 through a switching operation. The PA 304 connected to the RF switch 302 may transfer the amplified transmission signal to the RF switch 302 . The RF switch 302 may transfer the amplified transmission signal from the PA 304 to the antenna 301 . The antenna 301 may receive a transmission signal from the RF switch 302 . The antenna 301 may radiate a transmission signal into the air.

Meanwhile, a specific structure of the RF switch 302 may be as shown in FIG. 4 below.

4 is a circuit diagram showing the structure of an RF switch according to a first embodiment of the present invention.

Referring to FIG. 4 , the RF switch 400 may include first to fourth transistors 401 to 404 . The first to fourth transistors 401 to 404 may be metal oxide semiconductor (MOS) field effect transistors (FETs).

A first port of the RF switch 400 may be connected to an antenna. The second port of the RF switch 400 may be connected to the LNA. A third port of the RF switch 400 may be connected to a PA. Here, the RF switch 400 may be the same as or similar to the RF switch 302 of FIG. 3 . The antenna may be the same as or similar to antenna 301 of FIG. 3 . The LNA may be the same as or similar to the LNA 303 of FIG. 3 . The PA may be the same as or similar to the PA 304 of FIG. 3 .

The RF switch 400 may operate according to a reception mode or a transmission mode. For example, in the reception mode, the first transistor 401 and the fourth transistor 404 of the RF switch 400 may be turned on. Also, the second transistor 402 and the third transistor 403 of the RF switch 400 may be turned off. That is, in the case of the reception mode, the RF switch 400 may transfer the reception signal transmitted from the antenna 301 to the LNA through the first transistor 401 .

On the other hand, in the transmission mode, the second transistor 402 and the third transistor 403 of the RF switch 400 may be turned on. Also, the first transistor 401 and the fourth transistor 404 of the RF switch 400 may be turned off. That is, in the transmission mode, the RF switch 400 may transfer the transmission signal amplified from the PA to the LNA through the third transistor 403 .

On the other hand, when the RF switch 400 having the above-described structure is applied to a wireless communication system using millimeter waves, by parasitic components generated in the first to fourth transistors 401 to 404 Signal may be lost. That is, performance degradation may occur due to signal loss. In addition, the RF switch 400 may have low isolation between a transmission signal and a reception signal due to low isolation between the first to fourth transistors 401 to 404 .

The structure of the RF switch according to the second to fifth embodiments of the present invention to solve the above problem will be described with reference to FIGS. 5 to 8 below.

5 is a circuit diagram showing an RF switch according to a second embodiment of the present invention.

Referring to FIG. 5, the RF switch 500 includes a first line 511, a first switch 512, a first matching network 513, a second line 521, a second A switch 522 and a second matching network 523 may be included. The RF switch 500 may be connected to an antenna, LNA, and PA. Here, the first and second lines 511 and 521 may be λ/4 lines.

The RF switch 500 may be the same as or similar to the RF switch 300 of FIG. 3 . The LNA may be the same as or similar to the LNA 303 of FIG. 3 . The PA may be the same as or similar to the PA 304 of FIG. 3 .

For example, the first end of the first line 511 and the first end of the second line 521 may be connected to an antenna. A second terminal of the first line 511 may be connected to a first terminal of the first switch 512 and a first terminal of the first matching network 513 . A second terminal of the first switch 512 may be grounded. The second end of the first matching network 513 may be connected to the LNA.

A second end of the second line 521 may be connected to a first end of the second switch 522 and a first end of the second matching network 523 . A second terminal of the second switch 522 may be grounded. A second end of the second matching network 523 may be connected to the PA.

The RF switch 500 may operate according to a reception mode or a transmission mode. For example, in the reception mode, the first switch 512 may be turned off and the second switch may be turned on. On the other hand, in the transmission mode, the first switch 512 may be turned on and the second switch may be turned off.

Meanwhile, the structure of the RF switch according to the third embodiment of the present invention may be as shown in FIG. 6 below.

6 is a circuit diagram showing an RF switch according to a third embodiment of the present invention.

Referring to FIG. 6 , the RF switch 600 includes a first inductor 601, a second inductor 602, a first switch 603, a first matching network 604, a third inductor 605, and a fourth It may include an inductor 606, a second switch 607, and a second matching network 608. The RF switch 600 may be coupled with an antenna, LNA, and PA. Here, the RF switch 600 may be the same as or similar to the RF switch 300 of FIG. 3 . The LNA may be the same as or similar to the LNA 303 of FIG. 3 . The PA may be the same as or similar to the PA 304 of FIG. 3 .

For example, a first end of the first inductor 601 may be connected to an antenna. The second terminal of the first inductor 601 may be connected to the first terminal of the third inductor 605 . The first inductor 601 and the second inductor 602 may be electromagnetically coupled. A first terminal of the second inductor 602 may be connected to a first terminal of the first switch 603 and a first terminal of the first matching network 604 . A second terminal of the second inductor 602 may be connected to a second terminal of the first switch 603 and a second terminal of the first matching network 604 . A third end of the first matching network 604 may be connected to the LNA.

A first terminal of the third inductor 605 may be connected to a second terminal of the first inductor 601 . A second end of the third inductor 605 may be grounded. The third inductor 605 and the fourth inductor 606 may be electromagnetically coupled. A first terminal of the fourth inductor 606 may be connected to a first terminal of the second switch 607 and a first terminal of the second matching network 608 . A second terminal of the fourth inductor 606 may be connected to a second terminal of the second switch 607 and a second terminal of the first matching network 608 . A third end of the first matching network 604 may be connected to the PA.

The RF switch 600 may operate according to a reception mode or a transmission mode. For example, in the reception mode, the first switch 603 may be turned on and the second switch 607 may be turned off. On the other hand, the first switch 603 may be turned off and the second switch 607 may be turned on.

Meanwhile, the structure of the RF switch according to the fourth embodiment of the present invention may be as shown in FIG. 7 below.

7 is a circuit diagram showing an RF switch according to a fourth embodiment of the present invention.

Referring to FIG. 7 , the RF switch 700 includes a first matching network 701, a first switch 702, a second matching network 703, a first inductor 704, a second inductor 705, 2 switches 706 and a third matching network 707 may be included. The RF switch 700 may be coupled with an antenna, LNA, and PA. Here, the RF switch 700 may be the same as or similar to the RF switch 300 of FIG. 3 . The LNA may be the same as or similar to the LNA 303 of FIG. 3 . The PA may be the same as or similar to the PA 304 of FIG. 3 .

For example, the first end of the first matching network 701 may be connected to the first end of the antenna and the first inductor 704 . The second terminal of the first matching network 701 may be connected to the first terminal of the first switch 702 and the first terminal of the second matching network 703 . A second terminal of the first switch 702 may be grounded. A second end of the second matching network 703 may be connected to the LNA.

A first terminal of the first inductor 704 may be connected to an antenna and a first terminal of the first matching network 701 . A second end of the first inductor 704 may be grounded. The first inductor 704 and the second inductor 705 may be electromagnetically coupled. A first terminal of the second inductor 705 may be connected to a first terminal of the second switch 706 and a first terminal of the third matching network 707 . A second terminal of the second inductor 705 may be connected to a second terminal of the second switch 706 and a second terminal of the third matching network 707 . A third end of the third matching network 707 may be connected to the PA.

The RF switch 700 may operate according to a reception mode or a transmission mode. For example, in the reception mode, the first switch 702 may be turned on and the second switch 706 may be turned off. On the other hand, the first switch 702 may be turned off and the second switch 706 may be turned on.

Meanwhile, the structure of the RF switch according to the fifth embodiment of the present invention may be as shown in FIG. 8 below.

8 is a circuit diagram showing an RF switch according to a fifth embodiment of the present invention.

Referring to FIG. 8 , the RF switch 800 includes a first inductor 801, a second inductor 802, a first switch 803, a first matching network 804, a second switch 805, and a second switch 805. 2 matching networks 806. The RF switch 800 may be coupled with an antenna, LNA, and PA. Here, the RF switch 800 may be the same as or similar to the RF switch 300 of FIG. 3 . The LNA may be the same as or similar to the LNA 303 of FIG. 3 . The PA may be the same as or similar to the PA 304 of FIG. 3 .

A first end of the first inductor 801 may be connected to an antenna. A first terminal of the first inductor 801 may be connected to a first terminal of the second switch 803 and a first terminal of the second matching network 806 . The first inductor 801 and the second inductor 802 may be electromagnetically coupled. A first terminal of the second inductor 802 may be connected to a first terminal of the first switch 803 and a first terminal of the first matching network 804 . A second terminal of the second inductor 802 may be connected to a second terminal of the first switch 803 and a second terminal of the first matching network 804 . A third end of the first matching network 804 may be connected to the PA.

A first terminal of the second switch 805 may be connected to a second terminal of the first inductor 801 and a first terminal of the second matching network 806 . A second terminal of the second switch 805 may be grounded. A second end of the second matching network 806 may be connected to the LNA.

The RF switch 800 may operate according to a reception mode or a transmission mode. For example, in the reception mode, the first switch 803 may be turned on and the second switch 805 may be turned off. On the other hand, the first switch 803 may be turned off and the second switch 805 may be turned on.

On the other hand, transmission loss (TX loss), reception loss (RX loss), bandwidth, and integrated circuit (IC) of the RF switches 500 to 800 according to the second to fifth embodiments of the present invention A comparison of the area occupied by the phase may be shown in Table 1 below.

transmission loss reception loss bandwidth area Second Embodiment 500 high height wide bulky Third Embodiment (600) height height commonly commonly Fourth Embodiment (700) Moderate lowness narrow compact Fifth Embodiment (800) low commonly broadness littleness

Referring to Table 1, the bandwidth of the RF switch 500 according to the second embodiment of the present invention may be wide. However, both the transmit loss and receive loss of the RF switch 500 can be high. Also, an area occupied by the RF switch 500 on the integrated circuit may be large.

The bandwidth of the RF switch 600 according to the third embodiment of the present invention and the size of the area occupied on the integrated circuit may be normal. However, both transmit loss and receive loss of RF switch 600 can be high.

The reception loss of the RF switch 700 according to the fourth embodiment of the present invention may be low. Also, the size of the area occupied by the RF switch 700 on the integrated circuit may be small. However, the transmission loss of RF switch 700 may be moderate. Also, the bandwidth of the RF switch 700 may be narrow.

The reception loss of the RF switch 800 according to the fifth embodiment of the present invention may be low. Also, the bandwidth of the RF switch 800 may be wide. Also, the size of the area occupied by the RF switch 800 on the integrated circuit may be small. However, reception loss of the RF switch 800 may be normal. That is, the performance of the RF switch 800 according to the fifth embodiment of the present invention, when considering the transmission loss, bandwidth, and the size of the area occupied on the integrated circuit, the RF switch according to the second to fourth embodiments of the present invention (500 to 700). However, that is, the RF switch 800 according to the fifth embodiment of the present invention may have a weakness in reception loss.

Meanwhile, a more specific structure of the RF switch 800 will be described with reference to FIG. 9 below.

9 is a circuit diagram showing a transceiver including an RF switch according to a fifth embodiment of the present invention.

Referring to FIG. 9 , a transceiver 900 may include an antenna 910, an RF switch 920, a matching network 930, a PA 940, and an LNA 950. The transceiver 900 may be the same as or similar to the transceiver 300 of FIG. 3 .

The RF switch 920 may include a first capacitor 921 , a first inductor 922 , a switch 923 , a second inductor 924 , and a second capacitor 925 . Here, the second inductor 924 and the second capacitor 925 may be included in the PA 940.

A first terminal of the first capacitor 921 may be connected to the antenna 910 . The first inductor 922 may be connected in parallel with the first capacitor 921 . A second terminal of the first capacitor 921 may be connected to a first terminal of the first switch 923 and an input port of the matching network 930 . A second terminal of the first switch 923 may be grounded. An output port of the matching network 930 may be connected to an input port of the LNA 950.

The second inductor 924 may be electromagnetically coupled with the first inductor 922 . The second capacitor 925 may be connected in parallel with the second inductor 924 . The second inductor 924 and the second capacitor 925 may be connected to the output port of the PA 940 .

The above-described structure of the transceiver 900 may be a structure in which a path for transmitting a transmission signal and a path for transmitting a received signal are not diverged from the antenna 910 . For example, in the transmission mode, the switch 923 may be turned on. That is, in the transmission mode, the switch 923 may be grounded. The RF switch 920 may be electrically separated from the matching network 930. Therefore, the transmission signal amplified by the PA 940 may not be lost to the matching network 930 and the LNA 950. A transmit signal amplified by the PA 940 may be transferred to the first inductor 922 through the second inductor 924 . The first inductor 922 may transfer the transmission signal transferred from the second inductor 924 to the antenna 910 . The antenna 910 may radiate a transmission signal into the air.

In the reception mode, the switch 923 may be turned off. The received signal received through the antenna 910 may be transferred to the matching network 930 through the first inductor 922 . The matching network 930 may receive a received signal through the first inductor 922 . The matching network 930 may transfer the received signal to the LNA 950. The LNA 950 may receive a received signal from the matching network 930. LNA 950 may amplify the received signal.

Meanwhile, three factors that increase the insertion loss of the received signal in the transceiver 900 may be as follows. First, path loss due to a distance in the layout of the PA 940 and the LNA 950 in the transceiver 900 may increase insertion loss for a received signal. The problem of path loss can be solved by making the distances on the layout of the PA 940 and the LNA 950 close.

Second, leakage loss caused by a parasitic component of the switch 923 may increase insertion loss for a received signal. Depending on the size of the switch 923, reception performance and transmission performance may vary. Therefore, the leakage loss problem can be solved by optimizing the size of the switch 923.

Third, the received signal may leak to the second inductor 924 through the first inductor 922 . A portion of the received signal leaking into the second inductor 924 may increase insertion loss of the received signal.

Meanwhile, when performance of a frequency response to a transmission signal is improved, performance of a frequency response to a received signal may be degraded. That is, it may be difficult to simultaneously improve frequency response performance for a transmission signal and frequency response performance for a received signal. For example, graphs of the gain of the transmission signal and the gain of the reception signal according to the frequency of the transceiver 900 may be shown in FIGS. 10A and 10B below.

10A and 10B are graphs illustrating a gain of a transmission signal and a gain of a reception signal according to frequency of a transceiver according to a fifth embodiment of the present invention.

Referring to FIG. 10A , the gain of a transmission signal of a transceiver may be maximum in a frequency range of 25 to 30 GHz. The X-axis of the graph may represent the frequency of the transmission signal. The Y-axis of the graph may represent a gain value of a transmission signal transmitted to an antenna after being output from a power amplifier.

Meanwhile, referring to FIG. 10B , the gain of the transmission signal of the transceiver may be minimum in a frequency range of 25 to 30 GHz where the gain is maximum. The X-axis of the graph may represent the frequency of the received signal. The Y-axis of the graph may indicate a gain value of a received signal transmitted from the antenna and input to the low power amplifier.

Here, the transceiver may be the same as or similar to the transceiver 900 of FIG. 9 . For example, the gain value of the transmission signal may be a value measured for a transmission signal passing through the second inductor 924, the first inductor 922, and the antenna 910 of the transceiver 900 of FIG. . Also, the gain value of the received signal may be a value measured for the received signal passing through the antenna 910 and the first inductor 922 of the transceiver 900 of FIG. 9 .

Meanwhile, in the transceiver 900 of FIG. 9, LC-resonance points are formed at each of the first inductor 922 and the second inductor 924 to obtain the maximum gain for the transmission signal at a specific frequency. can be designed to be. However, the gain of the received signal may be minimal in the frequency range of 25 to 30 GHz due to the LC-resonance point formed in the transceiver 900 . That is, the operating bandwidth of the transceiver 900 is limited in the frequency range of 25 to 30 GHz, and insertion loss for a received signal may occur.

In order to solve the aforementioned problem of occurrence of insertion loss for a received signal, the transceiver may have a structure as shown in FIGS. 11A and 11B below.

11A and 11B are circuit diagrams showing the structure of a transceiver according to a sixth embodiment of the present invention.

Referring to FIG. 11A , the transceiver 1100 may include an antenna 1110, an RF switch unit 1120, a matching network 1130, an LNA 1140, and a PA 1150. The transceiver 1100 may be the same as or similar to the transceiver 300 of FIG. 3 . The RF switch unit 1120 includes a first inductor 1121, a second inductor 1122, a third inductor 1123, a first capacitor 1124, a second capacitor 1125, a first switch 1126, and A second switch 1127 may be included.

A first end of the second inductor 1122 may be connected to the antenna 1110 . The second terminal of the second inductor 1122 may be connected to the first terminal of the first switch 1126 and the input port of the matching network 1130 . The second inductor 1122 may be connected in parallel with the second capacitor 1125 . A second terminal of the first switch 1126 may be grounded.

The first inductor 1121 may be electromagnetically coupled to the second inductor 1122 . The first inductor 1121 may be connected in parallel with the first capacitor 1124 . The first inductor 1121 and the first capacitor 1124 may be connected to the output port of the PA 1150.

The third inductor 1123 may be electromagnetically coupled to the first inductor 1121 . The third inductor 1123 may be connected in parallel with the second switch 1127 . An output port of the matching network 1130 may be connected to an input port of the LNA 1140.

Here, the first inductor 1121, the first capacitor 1124, the second inductor 1122, and the second capacitor 1125 may operate as a first transformer. The first inductor 1121, the first capacitor 1124, the third inductor 1123, and the second switch 1127 may operate as a second transformer. The second inductor 1122, the second capacitor 1125, the third inductor 1123, and the second switch 1127 may operate as a third transformer.

Meanwhile, the RF switch unit 1120 may operate according to a transmission mode or a reception mode of the transceiver 1100 . For example, in the transmission mode, the first switch 1126 may be turned on and the second switch 1127 may be turned off. At this time, the PA 1150 may amplify the transmission signal and output the amplified signal to the first inductor 1121 .

The first inductor 1121 may receive the amplified transmission signal from the PA 1150 . The first inductor 1121 may transfer the transmission signal to the second inductor 1122 . For example, an induced current may be formed between the first inductor 1121 and the second inductor 1122 . The first inductor 1121 may transmit a transmission signal to the second inductor 1122 using an induced current.

Meanwhile, as the second switch 1127 is turned off, in the closed circuit composed of the second switch 1127 and the third inductor 1123, the off circuit formed at both ends of the second switch 1127 An impedance value may exceed a predetermined critical impedance value. Accordingly, the induced current formed between the first inductor 1121 and the second inductor 1122 may not affect the third inductor 1123 . That is, in a closed circuit composed of the second switch 1127 and the third inductor 1123, an induced current may not be formed as the second switch 1127 is turned off. Therefore, the third inductor 1123 may not affect the mutual inductance of the first inductor 1121 and the second inductor 1122 operating as the first transformer.

Meanwhile, when the first switch 1126 is turned on, the first switch 1126 may be grounded. As the first switch 1126 is grounded, the transmission signal may not be transferred to the matching network 1130 and the LNA 1140. That is, the matching network 1130 and the LNA 1140 may be turned off. In other words, the antenna 1110, the RF switch unit 1120, and the PA 1150 may operate as independent transmitters.

The second inductor 1122 may receive a transmission signal from the first inductor 1121 . The second inductor 1122 may transmit a transmission signal to the antenna 1110 . The antenna 1110 may receive a transmission signal from the second inductor 1122 . The antenna 1110 may radiate a transmission signal into the air.

Meanwhile, in the reception mode, the first switch 1126 may be turned off and the second switch 1127 may be turned on. At this time, the antenna 1110 may transfer the received signal to the second inductor 1122 .

As the second switch 1127 is turned on, in the closed circuit composed of the second switch 1127 and the third inductor 1123, the on impedance formed at both ends of the second switch 1127 ( impedance) may be less than a predetermined critical impedance value. Accordingly, an induced current may be generated between the second inductor 1122 and the third inductor 1123 operating as a third transformer. The induced current may change the mutual inductance between the first inductor 1121 and the second inductor 1122 operating as the first transformer. Also, the induced current may change resonance points of the first inductor 1121 and the second inductor 1122 . That is, the transceiver 1100 turns on or off the second switch 1127 to change the mutual inductance between the first inductor 1121 and the second inductor 1122, thereby changing the transmission signal and the reception signal. The frequency response characteristics of can be changed.

The second inductor 1122 may receive a received signal from the antenna 1110 . The second inductor 1122 may transfer the received signal to the matching network 1130 .

The matching network 1130 may receive a received signal from the second inductor 1122 . The matching network 1130 may deliver the received signal to the LNA 1140. The LNA 1140 may receive a received signal from the matching network 1130. LNA 1140 may amplify the received signal.

Referring to FIG. 11B , the first to third inductors 1121 to 1123 may be disposed to overlap on an integrated circuit (IC) on which the RF switch unit 1120 is mounted.

For example, the RF switch unit 1120 may include a plurality of stages. In this case, the third inductor 1123 may be disposed at the first end of the RF switch unit 1120 . The first inductor 1121 may be disposed at a second terminal of the RF switch unit 1120 . The second inductor 1122 may be disposed at a third end of the RF switch unit 1120 . Here, the second end may be formed on top of the first end. The third end may be formed on top of the second end.

At this time, the arrangement order of the first inductor 1121 to the third inductor 1123 may be variously modified. For example, the first inductor 1121 may be disposed at the second end of the transformer. The second inductor 1122 may be disposed at the third stage of the transformer. The third inductor 1123 may be disposed at the first end of the transformer. Alternatively, the first inductor 1121 may be disposed at the third terminal of the transformer. The second inductor 1122 may be disposed at the first end of the transformer. The third inductor 1123 may be disposed at the second end of the transformer.

Also, the RF switch unit 1120 may be composed of one stage. That is, the RF switch unit 1120 may be configured as a single layer. In this case, the third inductor 1123 may be wound in a shape surrounding the periphery of the first inductor 1121 . The first inductor 1121 may be wound around the outside of the second inductor 1122 . The first inductor 1121, the second inductor 1122, and the third inductor 1123 are electrically coupled by at least one of an edge-coupled method and a broad-side coupled method. can be coupled miraculously.

At this time, the arrangement order of the first inductor 1121 to the third inductor 1123 may be variously modified. For example, the first inductor 1121 may be wound in a shape surrounding the periphery of the second inductor 1122 . The third inductor 1123 may be wound in a shape surrounding the periphery of the first inductor 1121 . Alternatively, the second inductor 1122 may be wound in a shape surrounding the periphery of the third inductor 1123 . The first inductor 1121 may be wound around the outside of the second inductor 1122 .

In addition, the first inductor 1121 to the third inductor 1123 may be wound in various forms at a plurality of stages.

Meanwhile, the gain values according to the frequencies of the transmission signal and the reception signal of the transmission/reception apparatus 900 according to the fifth embodiment and the transmission/reception apparatus 1100 according to the sixth embodiment of the present invention are as shown in FIGS. 12A and 12B below. can be displayed

12A and 12B are graphs illustrating gain values according to frequencies of a transmission signal and a reception signal of a transmission/reception apparatus according to a fifth embodiment and a transmission/reception apparatus according to a sixth embodiment of the present invention.

Referring to FIG. 12A, a gain value graph 1210 according to the frequency of a transmission signal of a transmission/reception apparatus 900 according to a fifth embodiment of the present invention and a transmission/reception apparatus 1100 according to a sixth embodiment of the present invention The gain value graph 1220 according to the frequency of the transmission signal may have a similar form. The X axis of the graphs 1210 and 1220 may represent the frequency of the transmission signal. Y axes of the graphs 1210 and 1220 may represent gain values of transmission signals transmitted to the antenna after being output from the power amplifier. Here, the gain value graph 1210 according to the frequency of the transmission signal of the transceiver 900 according to the fifth embodiment may be the same as or similar to the graph shown in FIG. 10A.

Meanwhile, referring to FIG. 12B , a gain value graph 1230 according to the frequency of a received signal of the transceiver 900 according to the fifth embodiment of the present invention and the transceiver 1100 according to the sixth embodiment of the present invention The gain value graph 1240 according to the frequency of the transmission signal of ) may have different shapes. The X axis of the graphs 1230 and 1240 may represent the frequency of the received signal. Y axes of the graphs 1230 and 1240 may represent gain values of received signals transferred from the antenna and input to the low power amplifier. Here, the gain value graph 1210 according to the frequency of the received signal of the transceiver 900 according to the fifth embodiment may be the same as or similar to the graph shown in FIG. 10B.

Referring to the gain value graph 1210 according to the frequency of the received signal of the transceiver 900 according to the fifth embodiment of the present invention, the gain of the received signal of the transceiver 900 according to the fifth embodiment of the present invention The value may decrease rapidly at a point where the frequency of the received signal is 30 GHz.

In contrast, referring to the gain value graph 1240 according to the frequency of the transmission signal of the transceiver 1100 according to the sixth embodiment of the present invention, the reception of the transceiver 1100 according to the sixth embodiment of the present invention The gain value of the signal may not rapidly decrease at a point where the frequency of the received signal is 30 GHz.

That is, the transmission/reception apparatus 1100 according to the sixth embodiment of the present invention may have improved stability of received signal performance compared to the transmission/reception apparatus 900 according to the fifth embodiment of the present invention. Accordingly, the transmission/reception apparatus 1100 according to the sixth embodiment of the present invention can obtain the following effects.

First of all, the transceiver 1100 can reduce insertion loss of a received signal. The transceiver 1100 may improve a noise figure (NF) of a received signal. The transceiver 1100 may increase the bandwidth of the received signal. The transceiver 1100 may reduce insertion loss of a transmission signal. The transceiver 1100 may increase output power of a transmission signal. The transceiver 1100 may guarantee a degree of freedom in design of a transmission signal. The transmitting/receiving apparatus 1100 can simultaneously improve performance of a received signal and a transmitted signal. The transceiver 1100 may occupy a small area within a mounted integrated circuit.

The methods according to the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded on a computer readable medium. Computer readable media may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on a computer readable medium may be specially designed and configured for the present invention or may be known and usable to those skilled in computer software.

Examples of computer readable media include hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include high-level language codes that can be executed by a computer using an interpreter or the like as well as machine language codes generated by a compiler. The hardware device described above may be configured to operate with at least one software module to perform the operations of the present invention, and vice versa.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also included in the scope of the present invention. that fall within the scope of the right.

Claims (15)

In the transmission and reception device in the communication system,
a switch unit including first to third inductors and first and second switches;
an antenna connected to the switch unit;
a first amplifier connected to the switch unit;
a matching network connected to the switch unit; and
A second amplifier connected to the matching network; includes,
The first inductor is connected to the output port of the first amplifier,
A first terminal of the second inductor is connected to the antenna, and a second terminal of the second inductor is connected to a first terminal of the first switch and an input port of the matching network;
The third inductor is connected in parallel with the second switch,
A second terminal of the first switch is grounded. The method of claim 1,
The first switch is open in the receiving mode,
the second switch is closed in a receiving mode;
An impedance value formed at both ends of the second switch is less than a predetermined threshold impedance value. The method of claim 1,
The antenna transmits a received signal to the second inductor,
The second inductor generates a current according to the received signal,
When the second switch is closed, the third inductor generates an induced current according to the current,
The induced current changes mutual inductance between the first inductor and the second inductor. The method of claim 1,
The second inductor transfers the received signal received from the antenna to the matching network;
The matching network transfers the received signal received from the second inductor to the second amplifier;
Wherein the second amplifier amplifies the received signal. The method of claim 1,
the first switch is closed in a transmission mode;
The second switch is open in transmission mode,
An impedance value formed at both ends of the second switch exceeds a predetermined threshold impedance value. The method of claim 1,
The first to third inductors are physically separated,
The first to third inductors are coupled electromagnetically. The method of claim 1,
The switch unit includes a first end, a second end positioned above the first end, and a third end positioned above the second end,
The first inductor is disposed at the first end,
The second inductor is disposed at the second end so as to vertically overlap the first inductor,
wherein the third inductor is disposed at the third end so as to vertically overlap the second inductor. The method of claim 1,
The third inductor is wound to surround the periphery of the first inductor,
Wherein the first inductor is wound to surround the periphery of the second inductor. The method of claim 1,
The antenna transmits a received signal to the second inductor when the first switch is opened and the second switch is closed. The method of claim 1,
Wherein the first amplifier transmits an amplified transmission signal to the second inductor when the first switch is closed and the second switch is open. The method of claim 1,
The transmitting and receiving apparatus operates in a receiving mode when the first switch is opened and the second switch is closed. The method of claim 1,
The transmitting and receiving apparatus operates in a transmission mode when the first switch is closed and the second switch is opened. The method of claim 1,
Mutual inductance between the first inductor and the second inductor varies according to opening and closing of the second switch. The method of claim 1,
A frequency response characteristic of a transmission signal transmitted from the first amplifier to the antenna varies according to opening and closing of the second switch. The method of claim 1,
A frequency response characteristic of a received signal transmitted from the antenna to the second amplifier varies according to opening and closing of the second switch.

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