CN110350891B - A limiting circuit - Google Patents
A limiting circuit Download PDFInfo
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- CN110350891B CN110350891B CN201910728876.0A CN201910728876A CN110350891B CN 110350891 B CN110350891 B CN 110350891B CN 201910728876 A CN201910728876 A CN 201910728876A CN 110350891 B CN110350891 B CN 110350891B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/01—Shaping pulses
- H03K5/08—Shaping pulses by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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Abstract
本申请公开了一种限幅电路，该限幅电路包括：信号输入端、信号输出端、至少一个开关管和至少一个控制单元；其中至少一个控制单元用于控制至少一个开关管的导通和断开；至少一个开关管用于在导通状态下将信号输入端接收的射频信号的功率减弱后通过信号输出端输出。本申请公开的限幅电路采用功率检测器控制FET的导通和断开，实现对信号接收端信号功率的减小，且限幅电路中开关管可以串联、并联，能够用于制造小尺寸的限幅器件。
The present application discloses a limiting circuit, which includes: a signal input terminal, a signal output terminal, at least one switch tube and at least one control unit; wherein at least one control unit is used to control the on and off of at least one switch tube; at least one switch tube is used to weaken the power of the radio frequency signal received by the signal input terminal in the on state and then output it through the signal output terminal. The limiting circuit disclosed in the present application uses a power detector to control the on and off of a FET to reduce the signal power at the signal receiving terminal, and the switch tubes in the limiting circuit can be connected in series or in parallel, and can be used to manufacture a small-sized limiting device.
Description
Technical Field
The application relates to the radio frequency front end integrated circuit technology in the fields of radio communication and radar technology, in particular to a limiting circuit.
Technical Field
In wireless communication, radar, electronic countermeasure, etc., a transmitter transmits a radio signal, and a receiver receives the radio signal. Generally, the larger the transmitting power of the transmitter, the more favorable the communication and detection over a long distance, while the low noise receiving circuit at the front end of the receiver can bear very little burning-out resistance, generally about 10-20dBm, due to the requirement of high sensitivity. Therefore, there are two main situations that can cause the damage of the receiver, one is that the interference signal with larger external power is directly received by the antenna and enters the receiver, if the front stage of the receiver does not have any protection measures, the low noise in the receiver is burnt by the larger interference signal, so that the damage of the receiver is caused. Another situation is that when the circulator is adopted in the transceiver component as a duplex device, the isolation of the circulator is limited, and when the antenna is transmitted too much, the power of the high-power signal of the transmitter leaking to the receiver channel is too large, so that the receiver is damaged. In order to protect low noise amplifying and other power sensitive devices, a limiter is usually added in front of the devices for protection.
Disclosure of Invention
The application aims to provide a limiting circuit, which is favorable for optimizing a traditional limiter circuit, and further provides a basis for obtaining the limiting circuit with low cost and high performance and an integrated element thereof.
In order to solve the technical problems, the application discloses a limiting circuit which comprises a signal input end, a signal output end, at least one switching tube and at least one control unit, wherein the signal input end is connected with the signal output end;
the at least one control unit is used for controlling the on and off of the at least one switching tube;
the at least one switching tube is used for weakening the power of the radio frequency signal received by the signal input end in a conducting state and then outputting the radio frequency signal through the signal output end.
Compared with the traditional PIN diode-based structure, the amplitude limiting circuit disclosed by the application can be realized through the traditional silicon technology, so that the cost is low, and the amplitude limiting circuit is suitable for large-scale mass production; the limiting circuit disclosed by the application has excellent ESD performance because the input and output of signals in the limiting circuit do not need a blocking capacitor, and has small chip area occupied by the limiting circuit and can be used for manufacturing a small-size limiting device because the switching tube in the limiting circuit disclosed by the application can be connected in series and in parallel, and meanwhile, the insertion loss of the limiting circuit based on the limiting circuit disclosed by the application is small, the bandwidth is large and the power capacity is large because the switching tube can keep smaller capacitor in the disconnection state.
Drawings
Fig. 1 discloses a circuit diagram of a clipping circuit according to some embodiments of the application;
Fig. 2 discloses a circuit diagram of a clipping circuit with NMOS transistors as switching transistors, according to some embodiments of the present application;
FIG. 3 discloses a circuit diagram of a clipping circuit that provides a control voltage using a high resistance device and a voltage source, in accordance with some embodiments of the present application;
FIG. 4 discloses a circuit diagram of a clipping circuit that provides a control voltage using a switch and a voltage source, according to some embodiments of the application;
FIG. 5 discloses a circuit diagram of a clipping circuit that provides a control voltage using a power detector, according to some embodiments of the application;
FIG. 6 discloses a circuit diagram of a clipping circuit employing a diode and a resistor as a power detector, according to some embodiments of the application;
FIG. 7 discloses a circuit diagram of a clipping circuit employing a coupler and a diode as a power detector, according to some embodiments of the application;
FIG. 8 discloses a circuit diagram of a clipping circuit that uses an amplifier to amplify a control signal, according to some embodiments of the application;
fig. 9 discloses a circuit diagram of a clipping circuit employing a series connection of switching tubes, according to some embodiments of the application;
Fig. 10 discloses a circuit diagram of a clipping circuit employing a series of switches, according to some embodiments of the application;
FIG. 11 discloses a circuit diagram of a clipping circuit employing multiple switching tubes in parallel, according to some embodiments of the application;
fig. 12 discloses a circuit diagram of a clipping circuit employing two sets of switching tubes in parallel with each other, according to some embodiments of the application;
Fig. 13 discloses an exemplary diagram of a chip architecture of a clipping circuit according to the present disclosure, in accordance with some embodiments of the present application;
Fig. 14 discloses a chip assembly schematic diagram of a clipping circuit based on the present disclosure, according to some embodiments of the application;
Fig. 15 discloses a clip characteristic test chart based on the clip circuit of the present disclosure, according to some embodiments of the present application.
Detailed Description
Illustrative embodiments of the present application include, but are not limited to, a clipping circuit.
The present application will describe various aspects of the illustrative embodiments using terms commonly employed by those skilled in the art to convey the substance of their work to others skilled in the art. However, it will be apparent to those skilled in the art that some alternative embodiments may be practiced using portions of the described aspects. For purposes of explanation, specific numbers, materials and configurations are set forth in order to provide a thorough understanding of the illustrative embodiments. However, it will be apparent to one skilled in the art that alternative embodiments may be practiced without the specific details. In other instances, well-known features are omitted or simplified in order not to obscure the illustrative embodiments.
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
According to an embodiment of the present application, a clipping circuit is disclosed. Fig. 1 is a circuit diagram of the limiter circuit. Specifically, as shown in fig. 1, the radio frequency signal enters the limiter circuit from the input terminal and is output from the output terminal. The actual function of the switching tube in the circuit may be equivalent to a switch 103 connected between the input terminal 101 and the output terminal 102 in the figure, the on and off of which is controlled by a control voltage provided by a control unit 104. When the control voltage provided by the control unit 104 is small, the switch 103 is turned off to present a high-resistance state, and the signal transmission is not affected basically. When the control voltage provided by the control unit 104 exceeds the preset threshold, the switch 103 is turned on, and is in a low-resistance state, equivalent to a small resistor connected in parallel to the ground, and the resistance value of the resistor is reduced along with the increase of the control voltage provided by the control unit 104, and the radio frequency signal passes through the resistor to the ground, so that the output signal power is greatly reduced. Therefore, when the control voltage provided by the control unit 104 is sufficiently large, the output signal power can be limited within a safe range.
In some embodiments, the switching transistor may be implemented by a Field Effect Transistor (FET), specifically including Junction Field-Effect Transistor (JFET), high electron mobility transistor (High Electron Mobility Transistor, HEMT), metal-semiconductor Field effect transistor (Metal Semiconductor FET, MESFET), metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), and the like.
In some embodiments, the switching transistor is implemented using an N-type field effect transistor (NMOS FET) or a P-type field effect transistor (PMOS FET). As shown in fig. 2, in a specific embodiment implemented by using NMOS, when the control voltage provided by the control unit 204 is smaller than the threshold voltage of the switching tube 203, the switching tube 203 is in an off state, which is equivalent to a high-resistance state, and no current flows, so that the radio frequency signal can pass through with low insertion loss. When the control voltage provided by the control unit 204 is greater than the threshold voltage of the switching tube 203, the switching tube 203 is in a conducting state, equivalently a low-resistance state, and the impedance of the switching tube 203 decreases along with the increase of the control voltage provided by the control unit 204, equivalently a voltage-controlled current source. When the control voltage provided by the control unit 204 is large enough, the switching tube 203 is fully turned on, and is located in the triode region, and the on-resistance is small enough, so that most radio frequency signals pass through the resistor to the ground, and therefore the clipping effect is achieved.
Furthermore, it will be appreciated that in other embodiments, the switching tube may be implemented by other transistors, without limitation.
In some embodiments, there are various ways of providing the control unit of the switching tube in the circuit. As shown in fig. 3, a high resistance device 304 (which may be a resistor, an inductor, or a combination of both) is connected between the first electrode of the switching tube 303 and a voltage source 305. In practice, the impedance of high-resistance device 304 is typically much greater than the parasitic capacitance between node ① and node ②, and between node ① and node ③, so that the voltage magnitude at node ① is proportional to the voltage magnitude at node ②. At the same time, the impedance of the high-resistance device 304 is sufficiently large to prevent leakage of radio frequency signals through the high-resistance device 304. As shown in fig. 4, switch 404 is connected between a first electrode of switch tube 403 and a voltage source 405. When the switch 404 is in the on state, the voltage of the voltage source 405 is conducted to the first electrode of the switching tube 403, and then the switch 404 is turned off, so that the voltage of the first electrode of the switching tube 403 can be maintained. Furthermore, it is understood that in other embodiments, the control unit may also control the on and off of the switching tube in other manners, which is not limited herein.
In some embodiments, the voltage source may be replaced with a power detector 505 as shown in fig. 5. The power detector 505 has one end connected to the rf signal input terminal 101 and the other end connected to the switching tube 503 via the high-resistance device 504. The power detector 505 may detect the power of the rf signal input from the input terminal 101 and generate a corresponding dc voltage to control the on/off of the switching tube 503. When the power of the input rf signal is small, the dc voltage output by the power detector 505 is 0 or the output dc voltage is small, and the output voltage is insufficient to turn on the switching tube 503, which is equivalent to a high-resistance state, so that the rf signal can pass through with low insertion loss. When the power of the input rf signal is sufficiently high, the dc voltage output by the power detector 505 exceeds the threshold of the switching tube 503, so that the switching tube 503 is in an on state and the on resistance is sufficiently low, and most of the input rf signal passes through the resistor to the ground, so that the signal power reaching the output terminal 102 is reduced. The use of the power detector 505 has the advantage that the control voltage provided by the control unit changes along with the change of the power of the input rf signal, so that the whole limiter circuit can monitor the power of the input rf signal in real time, and the switching tube 503 is in a high-resistance or low-resistance state according to the power of the input rf signal, thereby achieving the purpose of limiting amplitude, and the whole process does not need to manually set the control voltage value provided by the control unit.
In some embodiments, there are multiple implementations of the power detector. As shown in fig. 6, the power detector 605 is composed of a diode 606 and a resistor 607. The anode of the diode 606 is connected to the input terminal 101, and the cathode of the diode 606 is connected to one end of the high-resistance device 604. Resistor 607 has one end connected to the cathode of diode 606 and the other end grounded. When the power of the rf signal input by the input terminal 101 is small, the diode 606 is not turned on sufficiently, the diode 606 is in a high-resistance state, and the control voltage of the corresponding control switch 603 is small and is not enough to turn on the switch 603, so that the rf signal can pass through with low insertion loss. When the power of the input rf signal is high, the diode 606 starts to conduct and rectifies the input rf signal, generating a dc signal that increases as the input rf power increases. When the power of the input rf signal is large enough, the dc signal generated by the diode 606 is sufficient to turn on the switch 603, and the on-resistance is small enough, so that most of the rf signal passes through the resistor 607 to ground. However, this structure has the disadvantage that the parasitic capacitance of the diode 606 affects the insertion loss of the limiter circuit, and that the diode 606 is directly connected to the input terminal 101, so that the diode 606 is easily burned out when the power of the input rf signal is high. Shown in fig. 7 is a power detector 705 of improved construction that includes a diode 706, a resistor 707, and a power coupler 708. A power coupler 708 is disposed near the input 101, the amount of coupling being sized according to the characteristics of the selected diode 706. The effect of diode 706 is the same as the effect of diode 606 in fig. 6, and the coupling amount of power coupler 708 is appropriate, with less impact on the insertion loss of the limiter circuit. Meanwhile, since the power of the signal coupled through the power coupler 708 is much smaller than that of the input section 101, the diode 706 is not easily burned out due to excessive current. A disadvantage of the configuration of fig. 7 is that the power coupled by the power coupler 708 to the diode 706 tends to be small, and it is difficult for the diode 706 to detect a large dc signal to turn on the switching tube 703. Fig. 8 shows a further improved structure of the power detector 805, in which an amplifier 809 is connected between the diode 806 and the high-resistance device 804 based on the structure of the power detector 705, and the amplifier 809 is used for amplifying the dc signal detected by the diode 806, so that the switch 803 can be turned on as soon as possible to implement clipping, i.e. reducing the starting level of the clipping circuit, and enhancing the driving capability to reduce the response recovery time.
In some embodiments, the FETs are well isolated from each other in certain processes, such as SOI processes, high resistance silicon processes, multi-well CMOS processes, gallium arsenide processes, etc., allowing the FETs to be connected in series. In such a process, a plurality of switching tubes in the limiter circuit according to the present invention may also be connected in series. Taking two switching transistors in series as an example, a clipping circuit according to the invention is shown in fig. 9. The second electrode of the switching tube 903 is connected to the input terminal 101, the third electrode is connected to the second electrode of the switching tube 905, and the third electrode of the switching tube 905 is grounded. Here, the on-off of the switching tube 903 is controlled by a control voltage supplied from the control unit 904, and the on-off of the switching tube 905 is controlled by a control voltage supplied from the control unit 906. The maximum benefit of the series connection of the switching tubes is that the maximum bearing power of the limiting circuit can be greatly improved. For example, if the maximum voltage that can be sustained by physical damage of a single switching tube is Vmax, then n switching tubes are connected in series, and the maximum voltage that can be sustained by physical damage is ideally increased to n×vmax, so that the maximum sustained power of the limiting circuit is also increased by n2 times. As shown in fig. 10, according to another embodiment of the present invention, a switching tube 1003 is connected in series with a switching tube 1005, a first electrode connection resistor 1004 of the switching tube 1003, and a first electrode connection resistor 1006 of the switching tube 1005. Here, the on-off of the switching tube 1003 and the switching tube 1005 are controlled in common by a control voltage supplied from the control unit 1007.
In some embodiments, a plurality of switching tubes in the clipping circuit according to the present invention may be connected in parallel, as shown in fig. 11, the switching tube 1103 is connected in parallel with the switching tube 1105, and the on-off of the switching tube 1103 is controlled by a control voltage provided by the control unit 1104, and the on-off of the switching tube 1105 is controlled by a control voltage provided by the control unit 1106. Similar to the above-mentioned limiter circuit comprising a plurality of switching tubes connected in series with each other, when the plurality of switching tubes are connected in parallel with each other, the on-off of each switching tube may be controlled by the control voltage provided by the respective control unit, or may be controlled by the control voltage provided by the same control unit.
In some embodiments, a plurality of switch tube sets formed by connecting a plurality of switch tubes in series can be connected in parallel, so that the parasitic capacitance of a single switch tube can be distributed in the plurality of switch tube sets, distributed matching is easy to realize, bandwidth is improved, and in the multi-tube set design, the consideration emphasis of each tube set can be different, so that better performance is realized. For example, the number of series of different tube sets may be different, and a large number of tube sets may withstand more power, but with longer response recovery times. While a small series number of tube sets, while receiving less power, can respond quickly to recovery. In practical application, the tube set with large series number and the tube set with small series number are used in parallel, so that the device can respond quickly and bear high power. As shown in fig. 12, an example of a clipping circuit based on a switching tube, which combines the above-mentioned techniques and structures, mainly includes a radio frequency signal transmission line 1204 for transmitting a radio frequency signal, and a control unit 1203 for detecting the power of the radio frequency signal input from the input terminal 101 and then generating corresponding control voltages to control the on/off of the first switching tube set 1201 and the second switching tube set 1202. The first switch tube set 1201 does not affect signal transmission in the off state, limits the input signal in the on state, and the second switch tube set 1202 forms an LC filter with the first switch tube set and the radio frequency signal transmission line 1204 in the off state, so that low-loss transmission of the input signal is ensured. The second set of switching tubes 1202 further clip the input signal when turned on, reducing the clipping level.
In some embodiments, the input end of the control unit 1203 is connected to the input end of the radio frequency signal transmission line 1204, and the output end is connected to the control ends of the first switching tube set 1201 and the second switching tube set 1202, for controlling the on-off of the switching tubes in the tube set. Wherein the first set of switching tubes 1201 is connected at one end to a radio frequency signal transmission line 1204 and at the other end to ground. A second set of switching tubes 1202 is connected at one end to a radio frequency signal transmission line 1204 and at the other end to ground.
In some embodiments, the rf signal transmission line 1204 between the input terminal 101 and the output terminal 102 is mainly composed of 4 sections of high-resistance microstrip lines 12041, 12042, 12043 and 12044, and is formed by stacking two layers of metal in a silicon process, and has a larger width and thickness so as to withstand high rf power. The transmission line input and output have pads for bond wires, the pad dimensions being 100um x 100um. Adjusting the width and length of the microstrip lines 12041, 12042, 12043 and 12044 can optimize the small signal S parameters of the limiter circuit to meet design requirements.
In some embodiments, the control unit 1203 mainly includes a detector diode 12031 and a resistor 12032, and a control port 12033. The positive electrode of the detection diode 12031 is connected to the input end of the radio frequency signal transmission line 1204, and the negative electrode is connected to the resistor 12032 and the control ends of the switch tube sets 1201 and 1202. Resistor 12032 has one end connected to the negative terminal of the detector diode and the other end connected to ground. Control port 12033 leads from the control port of the switch tube set. When the input signal power is small, the detection diode 12031 is not turned on. When the input signal power is greater than a certain value, the detection diode 12031 is turned on, and the output voltage signal is used for controlling the conduction state of each switching tube, so that the amplitude limiting effect is realized. When the input signal is restored to a normal value, the detector diode 12031 is turned off, the control terminal voltage is reduced by discharging each switching tube through the resistor 12032, the switching tube is turned off, and the output signal is restored to a normal value. In addition, the control port 12033 has two application modes, one is that a control signal can be accessed from the outside to control the on-off of the switch tube, and at the moment, the internal high-power switch is controlled by the external control signal. The other application mode is to suspend the control port, and the control signal is generated by the internal power detector to control the on-off of the high-power switch.
In some embodiments, the first set of switching tubes includes switching tubes 12011, 12013, 12015, 12017, 12019 connected in series with each other and resistors 12010, 12012, 12014, 12016, 12018 connected to the first electrodes of the switching tubes, respectively, in a series configuration that can withstand greater power. It should be understood that the number of the switching tubes connected in series is only illustrated by 5 switching tubes, and is not limited by the number of the switching tubes connected in series in a centralized manner, and the specific number needs to be selected according to the power size and the small signal S parameter index requirement to be born in the practical application. The resistors 12010, 12012, 12014, 12016, 12018 connected to the electrodes are connected to the first electrodes of the corresponding switching transistors, so as to isolate the radio frequency signals and reduce the insertion loss. In addition, the switching transistors 12011, 12013, 12015, 12017, 12019 are not required to have the same size, and may be specifically designed according to voltage distribution and index requirements. Likewise, the resistors 12010, 12012, 12014, 12016, 12018 are not required to be the same size. When the signal voltage amplitude is larger than the conduction voltage of the detection diode 12031 in the control unit 1203, each switch tube in the switch tube set 1201 is in a conduction state and is equivalent to a small resistor connected to the ground in parallel, and the radio frequency signal passes through the switch tube, so that the output signal power is greatly reduced.
In some embodiments, the second set of switching tubes 1202 includes switching tubes 12021, 12023, and 12025, and resistors 12020, 12022, and 12024, respectively, connected to the first electrode of each switching tube, each switching tube being connected in the same series configuration as each switching tube in the first set of switching tubes 1201. The number of the switching tubes in the second switching tube set can be smaller than that of the first switching tube set, so that when a radio frequency signal passes through the second switching tube set, the number of the series connection is small, the power spike can be quickly responded, the power spike is eliminated, and the amplitude limiting level is further reduced. It should be understood that the exemplary illustration is only with 3 switching tubes in series, and is not limited to a specific number of switching tubes in the second switching tube set.
A schematic diagram of a chip of a clipping circuit according to the present disclosure is shown in fig. 13. Preferably, the single chip has a length 950um and a width 1650um, and the positions of the input end 1301, the output end 1302 and the control end 1303 are shown in the figure, and the single chip is marked with characters, where RFin represents an input end interface of a radio frequency signal, RFout represents an output end interface of the radio frequency signal, and VCTRL represents a control end interface. In addition, the control end 1303 has two application modes, one is that a control signal can be accessed from the outside to control the on-off of the switch tube, and at the moment, the internal high-power switch is controlled by the external control signal. The other application mode is to suspend the control port, and control signals are generated by an internal radio frequency power detector to control the on-off of the high-power switch.
A schematic diagram of a chip assembly of a limiter circuit according to the present disclosure is shown in fig. 14. The chip can be bonded by conductive adhesive, and the input end 1301 and the output end 1302 can be connected by gold wires and external microstrip lines. Preferably, two wires may be used for connection, and the shorter the wire length, the better. The control end 1303 can be connected with an external microstrip line by adopting a gold wire, and can also be directly connected with an external control pin by adopting the gold wire. It should be noted that the input of the amplitude limiting circuit during assembly must correspond to the direction of signal transmission.
In some embodiments, fig. 15 shows a relationship between the input power Pin and the output power Pout when the continuous wave power signal is input to the limiter circuit in a normal temperature environment according to the present disclosure. The overall curve can be divided into two regions, a, the linear region. In this region, the input signal power Pin is small, the output signal power Pout and the input signal power Pin are almost the same, and the signal passes almost unattenuated, and B, the clipping region. In this region, the output signal power Pout starts to decay above a threshold level, i.e. above about 13dBm, and then is substantially within the designed safety range as the input signal power Pin increases. From the test results, it can be seen that the maximum leakage level of the disclosed limiter circuit is less than 15dBm when the input signal power Pin is less than or equal to 43 dBm.
In some embodiments, the wireless receiving device disclosed in the present application includes the clipping circuit in the above embodiments, and the structure of the wireless receiving device may be a wireless receiving device that is commonly used in the prior art and is capable of clipping an input radio frequency signal, and mainly includes a front end of the receiving device, a demodulator, a clipping device, a device housing, and the like. The limiter in the wireless receiving device reduces the power of the received radio frequency signal by using the limiter circuit disclosed by the application, so that the low noise amplifier in the receiver is prevented from being burnt, and the protection of the wireless signal receiver is realized. It should be understood that the wireless receiving device including the clipping circuit disclosed in the present application is only used for illustration, and the specific structure and application environment of the wireless receiving device are not limited, and the specific structure and parameters of the wireless receiving device can be selected and adjusted according to actual needs.
The application also discloses some embodiments, in particular:
Embodiment 1 may include a clipping circuit including a signal input terminal, a signal output terminal, at least one switching tube, and at least one control unit;
the at least one control unit is used for controlling the on and off of the at least one switching tube;
the at least one switching tube is used for weakening the power of the radio frequency signal received by the signal input end in a conducting state and then outputting the radio frequency signal through the signal output end.
Embodiment 2 may include the circuit of embodiment 1, wherein the clipping circuit further includes at least one resistor corresponding to each of the at least one switching tube, a first electrode of the switching tube is connected to a first end of the corresponding resistor, and a second end of the resistor is connected to the control unit.
Embodiment 3 may include the circuit of embodiment 1 or 2, wherein the clipping circuit includes a switching tube, a first electrode of the switching tube is connected to the control unit, a second electrode of the switching tube is connected to the signal input terminal and the signal output terminal, and a third electrode of the switching tube is grounded.
Embodiment 4 may include the circuit of any one of embodiments 1-3, the clipping circuit including at least two switching tubes connected in parallel with each other.
Embodiment 5 may include the circuit of any one of embodiments 1 to 4, wherein the second electrodes of the at least two switching tubes are connected to the signal input terminal and the signal output terminal, and the third electrodes of the at least two switching tubes are grounded.
Embodiment 6 may include the circuit of any one of embodiments 1-5, the first electrodes of the at least two switching tubes being connected to two control units, respectively.
Embodiment 7 may include the circuit of any one of embodiments 1-5, the first electrodes of the at least two switching tubes being connected to the same control unit.
Embodiment 8 may include the circuit of any one of embodiments 1-3, the clipping circuit including at least two switching tubes connected in series with each other.
Embodiment 9 may include the circuit of embodiment 8, wherein a second electrode of a first switching tube of the at least two switching tubes is connected to the signal input terminal and the signal output terminal, and a third electrode of a second switching tube of the at least two switching tubes is grounded.
Embodiment 10 may include the circuit of embodiment 8 or 9, wherein the first electrodes of the at least two switching tubes are connected to two control units, respectively.
Embodiment 11 may include the circuit of embodiment 8 or 9, wherein the first electrodes of the at least two switching tubes are connected to the same control unit.
Embodiment 12 may include the circuit of any one of embodiments 1 to 11, the clipping circuit including a first set of switching tubes and a second set of switching tubes connected in parallel with each other;
The first switching tube set comprises at least two switching tubes which are connected in series, and the second switching tube set comprises at least two switching tubes which are connected in series.
Embodiment 13 may include the circuit of any one of embodiments 1 to 12, wherein the second electrode of one of the first set of switching tubes is connected to the signal input terminal and the signal output terminal, and the third electrode is connected to the second electrode of the switching tube connected in series with the switching tube.
Embodiment 14 may include the circuit of any one of embodiments 1 to 12, wherein the third electrode of one of the switching tubes of the first set of switching tubes is grounded, and the second electrode is connected to the third electrode of the switching tube connected in series with the switching tube.
Embodiment 15 may include the circuit of any one of embodiments 1 to 12, wherein the second electrode of one of the second set of switching tubes is connected to the signal input terminal and the signal output terminal, and the third electrode is connected to the second electrode of the switching tube connected in series with the switching tube.
Embodiment 16 may include the circuit of any one of embodiments 1-12, wherein the third electrode of one of the second set of switching tubes is grounded, and the second electrode is connected to the third electrode of the switching tube in series with the switching tube.
Embodiment 17 may include the circuit of any one of embodiments 1-16, the first electrodes of different switching tubes included in the first and second sets of switching tubes being connected to the same control unit.
Embodiment 18 may include the circuit of any one of embodiments 1-16, the first electrodes of different switching tubes included in the first and second sets of switching tubes being connected to different control units.
Embodiment 19 may include the circuit of any one of embodiments 1-18, the control unit being a voltage source.
Embodiment 20 may include the circuit of any one of embodiments 1-18, the control unit being a power detector.
Embodiment 21 may include the circuit of embodiment 20, wherein the power detector is capable of generating a corresponding dc voltage to control on and off of the switching tube according to the detected power of the signal input terminal.
Embodiment 22 may include the circuit of any one of embodiments 1-21, the switching transistor being a field effect transistor.
Embodiment 23 may include a wireless receiving apparatus including the clipping circuit of any one of embodiments 1 to 22.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the embodiments, and various changes can be made by those skilled in the art without departing from the spirit and scope of the invention.
In the drawings, some structural or methodological features may be shown in a particular arrangement and/or order. However, it should be understood that such a particular arrangement and/or ordering may not be required. Rather, in some embodiments, these features may be arranged in a different manner and/or order than shown in the illustrative figures. Additionally, the inclusion of structural or methodological features in a particular figure is not meant to imply that such features are required in all embodiments, and in some embodiments, may not be included or may be combined with other features.
It should be noted that in the examples and descriptions of the present invention, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the application has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the application.
Claims (21)
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| CN117118377B (en) * | 2023-10-23 | 2024-01-16 | 上海安其威微电子科技有限公司 | Amplitude limiting circuit and radio frequency chip |
| CN117176098A (en) * | 2023-11-01 | 2023-12-05 | 上海安其威微电子科技有限公司 | Amplitude limiting circuit and wireless transceiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9935678B1 (en) * | 2016-10-04 | 2018-04-03 | Psemi Corporation | Broadband power limiter |
| CN210867621U (en) * | 2019-08-08 | 2020-06-26 | 上海安其威微电子科技有限公司 | Amplitude limiting circuit and wireless receiving device |
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| JP2009065485A (en) * | 2007-09-07 | 2009-03-26 | Panasonic Corp | Switching control device and motor drive device |
| CN102571097B (en) * | 2010-12-31 | 2014-10-15 | 国民技术股份有限公司 | Voltage amplitude limiting circuit for controlling current supply switch of current steering analog-to-digital converter |
| CN202268862U (en) * | 2011-07-22 | 2012-06-06 | 成都亚光电子股份有限公司 | Amplitude limiter of microwave switch |
| CN202713158U (en) * | 2012-07-27 | 2013-01-30 | 成都芯源系统有限公司 | Switch converter and control circuit thereof |
| US10505501B2 (en) * | 2013-07-09 | 2019-12-10 | Skyworks Solutions, Inc. | Power amplifier with input power protection circuits |
| CN105245196B (en) * | 2015-10-22 | 2018-08-31 | 中国船舶重工集团公司第七二四研究所 | A kind of frequency-division section coupling detection control limiter |
| US10447032B2 (en) * | 2016-10-04 | 2019-10-15 | Psemi Corporation | Adjustable power limiter with integrated power detector |
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| US9935678B1 (en) * | 2016-10-04 | 2018-04-03 | Psemi Corporation | Broadband power limiter |
| CN210867621U (en) * | 2019-08-08 | 2020-06-26 | 上海安其威微电子科技有限公司 | Amplitude limiting circuit and wireless receiving device |
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