CN102938657A - Radio frequency front end device - Google Patents
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- CN102938657A CN102938657A CN2012104538175A CN201210453817A CN102938657A CN 102938657 A CN102938657 A CN 102938657A CN 2012104538175 A CN2012104538175 A CN 2012104538175A CN 201210453817 A CN201210453817 A CN 201210453817A CN 102938657 A CN102938657 A CN 102938657A
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Abstract
The invention provides a radio frequency front end device. The device comprises a low-frequency amplifier, a high-frequency amplifier, an amplifier controller, a first low-frequency matching network, a second low-frequency matching network, a first high-frequency matching network, a second high-frequency matching network, a duplexer, a first switching group working cooperatively with low-frequency signals and a second switching group working cooperatively with high-frequency signals. Single-pole multi-throw switches are not needed, low-frequency signals and high-frequency signals need not pass through the switches to reach antennae during the transmission, and accordingly, the amplified low-frequency signals and high-frequency signals need not pass through the switches. The low-frequency signals and high-frequency signals pass through the switches only during the receiving of the signals, and hence, amplified radio frequency signals cannot pass through the switches, the switches cannot bear large power, switch model selection requirements are low, and switches which are high in price and capable of bearing large power and high-voltage swings are not needed to be selected. The cost of the whole radio frequency front end device can be reduced.
Description
Technical field
The present invention relates to the communication equipment technical field, particularly a kind of radio frequency front-end device.
Background technology
Radio-frequency front-end refers to the part near antenna, comprises the emission path and receives path.
Introduce in detail the formation of radio-frequency front-end of the prior art below in conjunction with accompanying drawing.
Referring to Fig. 1, this figure is a kind of radio frequency front-end device schematic diagram of the prior art.
As shown in Figure 1, radio frequency front-end device of the prior art comprises: radio-frequency power amplifier 100, amplifier controller 200, matching network 300 and radio-frequency (RF) switch 400 form.
Need to prove, radio-frequency power amplifier 100 wherein comprises low frequency amplifier 101 and high-frequency amplifier 102; Matching network comprises the first low frequency matching network 301, the second low frequency matching network 302, the first high-frequency matching network 303 and the second high-frequency matching network 304; Radio-frequency (RF) switch 400 is single pole multiple throw, comprises a fixed contact SW, and four moving contacts are respectively SW1, SW2, SW3 and SW4.
This radio-frequency front-end by four moving contacts in the radio-frequency (RF) switch 400 respectively with the reception and the emission that contact to select signal of fixed contact.
The below introduces its operation principle as an example of the low frequencies of signal example;
Low frequency signal arrives radio-frequency (RF) switch 400 by low frequency amplifier 101, low frequency matching network 1, low frequency matching network 2 302 successively by low frequency input terminal INL, moving contact SW2 in the radio-frequency (RF) switch 400 contacts with fixed contact SW at this moment, and low frequency signal is just launched by antenna ANT like this.
Because radio-frequency (RF) switch 400 is single pole multiple throw, only has SW to contact conducting with SW2, therefore, other transmit and receive path and all are in off-state, can not exert an influence to low frequency signal.
The emission of high-frequency signal and the emission of low frequency signal are similar, and high-frequency signal is entered by high frequency input terminal ING.In this no longer concrete example explanation.
The reception of radiofrequency signal is also similar, and the radiofrequency signal that antenna ANT receives is switched to low frequency receiving terminal RXL by radio-frequency (RF) switch 400 and receives low frequency signal or receive high-frequency signal to high frequency receiving terminal RXG.
By the introduction of above emission situation to radiofrequency signal, can learn, arrive antenna ANT by radio-frequency (RF) switch 400 after radiofrequency signal is exaggerated, thereby emission of radio frequency signals is gone out.Therefore, radio-frequency (RF) switch 400 need to be by the signal of relatively high power, and the voltage that bears is also higher, so just needs to bear the radio-frequency (RF) switch 400 of the higher and high voltage amplitude of oscillation of power, otherwise will cause radio-frequency (RF) switch 400 damaged.
In sum, this radio-frequency front-end of the prior art is had relatively high expectations to the type of radio-frequency (RF) switch 400, therefore will cause the cost of whole radio-frequency front-end higher.Summary of the invention
The technical problem to be solved in the present invention provides a kind of radio frequency front-end device, do not need through switch during emission of radio frequency signals, therefore, arrive antenna through switch after being exaggerated in the time of can avoiding emission of radio frequency signals, switch does not need to bear larger power and higher voltage swing.
The invention provides a kind of radio frequency front-end device, comprising: low frequency amplifier, high-frequency amplifier, amplifier controller, the first low frequency matching network, the second low frequency matching network, the first high-frequency matching network, the second high-frequency matching network, duplexer, with the first switches set of low frequency signal collaborative work, with the second switch group of high-frequency signal collaborative work;
The input of described low frequency amplifier connects the low frequency signal input, and the output of low frequency amplifier connects the input of the first low frequency matching network, and the output of the first low frequency matching network connects the low frequency port of described duplexer; The antenna port of described duplexer connects antenna;
The input of described high-frequency amplifier connects the high-frequency signal input, and the output of high-frequency amplifier connects the input of the first high-frequency matching network, and the output of the first high-frequency matching network connects the high frequency port of described duplexer;
The low frequency port of described duplexer connects an end of described the second low frequency matching network, and the other end of the second low frequency matching network connects the low frequency receiving port, and described low frequency receiving port is by the first switches set ground connection;
The high frequency port of described duplexer connects an end of described the second high-frequency matching network, and the other end of the second high-frequency matching network connects the high frequency receiving port, and described high frequency receiving port is by second switch winding ground;
By conducting or the shutoff of controlling the switch in the first switches set, so that low frequency signal receives and the be independent of each other performance of low frequency signal of the first low frequency matching network and the second low frequency matching network during emission;
By conducting or the shutoff of the switch in the control second switch group, so that high-frequency signal receives and the be independent of each other performance of high-frequency signal of the first high-frequency matching network and the second high-frequency matching network during emission.
Preferably, described the first switches set and second switch group all are arranged in described amplifier controller.
Preferably, described the first switches set is arranged in described low frequency amplifier; Described second switch group is arranged in described high-frequency amplifier.
Preferably, described the first switches set, second switch group, amplifier controller, low frequency amplifier and high-frequency amplifier all are integrated on the same chip.
Preferably, described the first switches set comprises the first switch; Described second switch group comprises second switch;
Described the first low frequency matching network comprises the first inductance, the second inductance, the first electric capacity and the second electric capacity; Described the first inductance, the second inductance, the first electric capacity and the second electric capacity are connected to low-pass network;
Described the first high-frequency matching network comprises the 5th inductance, the 6th inductance, the 4th electric capacity and the 5th electric capacity; Described the 5th inductance, the 6th inductance, the 4th electric capacity and the 5th electric capacity are connected to low-pass network;
Described the second low frequency matching network comprises the 8th electric capacity;
Described the second high-frequency matching network comprises the 9th electric capacity;
One end of described the first switch connects the low frequency receiving port, connects simultaneously the low frequency port of duplexer by described the 8th electric capacity; The other end ground connection of described the first switch;
During the low frequency signal emission, the first switch conduction; When low frequency signal received, the first switch disconnected;
One end of described second switch connects the high frequency receiving port, connects simultaneously the high frequency port of duplexer by described the 9th electric capacity; The other end ground connection of described second switch;
During the high-frequency signal emission, the second switch conducting; When high-frequency signal received, second switch disconnected.
Preferably, described the first switches set comprises the first switch and the 3rd switch; Described second switch group comprises second switch and the 4th switch;
Described the first low frequency matching network comprises the first inductance, the second inductance, the first electric capacity and the second electric capacity; Described the first inductance, the second inductance, the first electric capacity and the second electric capacity are connected to low-pass network;
Described the first high-frequency matching network comprises the 5th inductance, the 6th inductance, the 4th electric capacity and the 5th electric capacity; Described the 5th inductance, the 6th inductance, the 4th electric capacity and the 5th electric capacity are connected to low-pass network;
Described the second low frequency matching network comprises the 8th electric capacity and the tenth electric capacity;
Described the second high-frequency matching network comprises the 9th electric capacity and the 11 electric capacity;
One end of described the first switch connects the first low frequency receiving port, connects simultaneously the low frequency port of duplexer by described the 8th electric capacity; The other end ground connection of described the first switch; One end of described the 3rd switch connects the second low frequency receiving port, connects simultaneously the low frequency port of duplexer by described the tenth electric capacity; The other end ground connection of described the 3rd switch;
During low frequencies, described the first switch and the equal conducting of the 3rd switch;
When the first low frequency receiving port received signal, the first switch disconnected, the 3rd switch conduction;
When the second low frequency receiving port receives signal, the first switch conduction, the 3rd switch disconnects;
One end of described second switch connects the first high frequency receiving port, connects simultaneously the high frequency port of duplexer by described the 9th electric capacity; The other end ground connection of described second switch; One end of described the 4th switch connects the second high frequency receiving port, connects simultaneously the high frequency port of duplexer by described the 11 electric capacity; The other end ground connection of described the 4th switch;
During high-frequency emission, described second switch and the equal conducting of the 4th switch;
When the first high frequency receiving port received signal, second switch disconnected, the 4th switch conduction;
When the second high frequency receiving port receives signal, the second switch conducting, the 4th switch disconnects.
Preferably, described the first switches set comprises the first switch, the 5th switch and the 6th switch; Described second switch group comprises second switch, minion pass and the 8th switch;
Described the first low frequency matching network comprises the first inductance, the second inductance, the first electric capacity and the second electric capacity; Described the first inductance, the second inductance, the first electric capacity and the second electric capacity are connected to low-pass network;
Described the first high-frequency matching network comprises the 5th inductance, the 6th inductance, the 4th electric capacity and the 5th electric capacity; Described the 5th inductance, the 6th inductance, the 4th electric capacity and the 5th electric capacity are connected to low-pass network;
Described the second low frequency matching network comprises the 14 electric capacity;
Described the second high-frequency matching network comprises the 15 electric capacity;
One end of described the first switch connects the first low frequency receiving port and is connected the 6th switch and connects the second low frequency receiving port by the 5th switch respectively, connects simultaneously the low frequency port of duplexer by described the 14 electric capacity; The other end ground connection of described the first switch;
During low frequencies, described the first switch conduction, the 5th switch and the 6th on off state are any;
When the first low frequency receiving port received signal, the first switch disconnected, the 5th switch conduction, and the 6th switch disconnects;
When the second low frequency receiving port received signal, the first switch disconnected, and the 5th switch disconnects, the 6th switch conduction;
One end of described second switch close to connect the first high frequency receiving port and is connected the 8th switch and connects the second high frequency receiving port by minion respectively, connects simultaneously the high frequency port of duplexer by described the 15 electric capacity; The other end ground connection of described second switch;
During high-frequency emission, described second switch conducting, the state of minion pass and the 8th switch is any;
When the first high frequency receiving port received signal, second switch disconnected, and minion is closed conducting, and the 8th switch disconnects;
When the second high frequency receiving port received signal, second switch disconnected, and minion is closed and disconnected the 8th switch conducting.
Preferably, described duplexer comprises: the 3rd inductance, the 4th inductance, the 3rd electric capacity, the 6th electric capacity, the 7th electric capacity and the 7th inductance;
One end of described the 3rd inductance connects the low frequency port of described duplexer, and the other end connects antenna port by described the 4th inductance; The common port of the 3rd inductance and the 4th inductance is by the 3rd capacity earth;
One end of described the 6th electric capacity connects the high frequency port of described duplexer, and the other end connects antenna port by described the 7th electric capacity; The common port of the 6th electric capacity and the 7th electric capacity is by the 7th inductance ground connection.
Preferably, described duplexer comprises: the 8th inductance, the 9th inductance, the 12 electric capacity and the 13 electric capacity;
One end of described the 8th inductance connects the low frequency port of described duplexer, and the other end is by described the 12 electric capacity; The antenna port of described duplexer is by described the 12 capacity earth;
One end of described the 13 electric capacity connects the high frequency port of described duplexer, and the other end is by described the 9th inductance; The antenna port of described duplexer is by described the 9th inductance ground connection.
Compared with prior art, the present invention has the following advantages:
This radio frequency front-end device does not need to arrange single pole multiple throw, when low frequency signal emission and high-frequency signal emission, does not all need to arrive antenna through switch, and therefore, the low frequency signal and the high-frequency signal that are exaggerated do not need through switch.Just pass through switch when only low frequency signal and high-frequency signal receive, to not have like this radiofrequency signal process switch after being exaggerated, switch just can not bear larger power like this, requirements of type selecting for switch is lower like this, needn't select price high can bear the high-power and switch high voltage amplitude of oscillation.Can reduce the cost of whole radio frequency front-end device.
Description of drawings
Fig. 1 is a kind of radio frequency front-end device schematic diagram of the prior art;
Fig. 2 is radio frequency front-end device embodiment one schematic diagram provided by the invention;
Fig. 3 is radio frequency front-end device embodiment two schematic diagrames provided by the invention;
Fig. 4 is radio frequency front-end device embodiment three schematic diagrames provided by the invention;
Fig. 5 is radio frequency front-end device embodiment four schematic diagrames provided by the invention;
Fig. 6 is radio frequency front-end device embodiment five schematic diagrames provided by the invention;
Fig. 7 is duplexer embodiment one structure chart provided by the invention;
Fig. 8 is duplexer embodiment one structure chart provided by the invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.
Referring to Fig. 2, this figure is radio frequency front-end device embodiment one schematic diagram provided by the invention.
The embodiment of the invention provides a kind of radio frequency front-end device, comprising: low frequency amplifier 101, high-frequency amplifier 102, amplifier controller (not shown), the first low frequency matching network 301, the second low frequency matching network 302, the first high-frequency matching network 303, the second high-frequency matching network 304, duplexer 400, with the first switches set 500 of low frequency signal collaborative work, with the second switch group 600 of high-frequency signal collaborative work;
The input of described low frequency amplifier 101 connects low frequency signal input INL, and the output of low frequency amplifier 101 connects the input of the first low frequency matching network 301, and the output of the first low frequency matching network 301 connects the low frequency port of described duplexer 400; The antenna port of described duplexer 400 connects antenna ANT;
The input of described high-frequency amplifier 102 connects high-frequency signal input ING, and the output of high-frequency amplifier 102 connects the input of the first high-frequency matching network 303, and the output of the first high-frequency matching network 303 connects the high frequency port of described duplexer 400;
The low frequency port of described duplexer 400 connects an end of described the second low frequency matching network 302, and the other end of the second low frequency matching network 302 connects low frequency receiving port RXL; Described low frequency receiving port RXL is by the first switches set 500 ground connection;
The high frequency port of described duplexer 400 connects an end of described the second high-frequency matching network 304, and the other end of the second high-frequency matching network 304 connects high frequency receiving port RXG; Described high frequency receiving port RXG is by second switch group 600 ground connection.
By controlling conducting or the shutoff of the switch in the first switches set 500, so that low frequency signal receives and the be independent of each other performance of low frequency signal of the first low frequency matching network 301 and the second low frequency matching network 302 during emission;
By conducting or the shutoff of the switch in the control second switch group 600, so that high-frequency signal receives and the be independent of each other performance of high-frequency signal of the first high-frequency matching network 303 and the second high-frequency matching network 304 during emission.
The operation principle of this radio frequency front-end device is described below in conjunction with Fig. 1:
Low-frequency input signal with its amplification, then arrives antenna ANT by the first low frequency matching network 301 and duplexer 400 by low frequency amplifier 101, and ANT launches by antenna.
High-frequency input signal with its amplification, then arrives antenna ANT by the first high-frequency matching network 303 and duplexer 400 by high-frequency amplifier 102; ANT launches by antenna.
After the reception signal of low frequency receives by antenna ANT, arrive the first switches set 500 by duplexer 400 and the second low frequency matching network 302 successively, finally arrive low frequency receiving port RXL.
After the reception signal of high frequency receives by antenna ANT, arrive second switch group 600 by duplexer 400 and the second high-frequency matching network 304 successively, finally arrive high frequency receiving port RXG.
This radio frequency front-end device does not need to arrange single pole multiple throw, when low frequency signal emission and high-frequency signal emission, does not all need to arrive antenna through switch, and therefore, the low frequency signal and the high-frequency signal that are exaggerated do not need through switch.Just pass through switch when only low frequency signal and high-frequency signal receive, to not have like this radiofrequency signal process switch after being exaggerated, switch just can not bear larger power like this, requirements of type selecting for switch is lower like this, needn't select price high can bear the high-power and switch high voltage amplitude of oscillation.Can reduce the cost of whole radio frequency front-end device.
The principle of the radio frequency front-end device that the embodiment of the invention provides is, when low frequency signal was launched, the second low frequency matching network 302 did not affect the emission of low frequency signal; When low frequency signal received, signal was by the second low frequency matching network 302, and the first low frequency matching network 301 does not affect the performance that low frequency signal receives.Solution is to regulate the second low frequency matching network 302 by the conducting of controlling the switch in the first switches set and disconnection, make it participate in the coupling of emission, by the impedance of control low frequency amplifier, make the first low frequency matching network 301 when low frequency signal receives, not affect the performance that low frequency receives signal.In like manner, the operation principle that transmits and receives of high-frequency signal is similar.
Need to prove, among the embodiment shown in Figure 1, described the first switches set 500 is arranged in described low frequency amplifier 101; Described second switch group 600 is arranged in described high-frequency amplifier 102.
Below among a kind of embodiment, described the first switches set and second switch group all are arranged in described amplifier controller.
Referring to Fig. 3, this figure is radio frequency front-end device embodiment two schematic diagrames provided by the invention.
Radio-frequency front-end embodiment shown in Figure 3 and difference embodiment illustrated in fig. 2 are, the first switches set among Fig. 3 and second switch group are arranged in amplifier controller 700 practical applications, and the first switches set and second switch group are produced on amplifier controller is integrated.
Need to prove, in another kind of embodiment provided by the invention, described the first switches set, second switch group and can all be integrated on the same chip with amplifier controller, low frequency amplifier and high-frequency amplifier.
In the radio frequency front-end device that specifically the accompanying drawing detailed description embodiment of the invention provides, how to cooperate transmitting and receiving of radiofrequency signal by the operating state of controlling the first switches set and second switch group.
Referring to Fig. 4, this figure is radio frequency front-end device embodiment three schematic diagrames provided by the invention.
As shown in Figure 4, the first switches set comprises the first switch SW 1 in the present embodiment; The second switch group comprises second switch SW2;
Described the first low frequency matching network 301 comprises the first inductance L 1, the second inductance L 2, the first capacitor C 1 and the second capacitor C 2; Described the first inductance L 1, the second inductance L 2, the first capacitor C 1 and the second capacitor C 2 are connected to low-pass network; As shown in Figure 4, the end of L1 connects the output of low frequency amplifier 101, and the other end of L1 connects the low frequency port of duplexer 400 by L2; The common port of L1 and L2 is by C1 ground connection; The low frequency port of duplexer 400 is by C2 ground connection.
Described the first high-frequency matching network 303 comprises the 5th inductance L 5, the 6th inductance L 6, the 4th capacitor C 4 and the 5th capacitor C 5; Described the 5th inductance L 5, the 6th inductance L 6, the 4th capacitor C 4 and the 5th capacitor C 5 are connected to low-pass network; As shown in Figure 4, the end of L5 connects the output of high-frequency amplifier 102, and the other end of L5 connects the high frequency port of duplexer 400 by L6; The common port of L5 and L6 is by C4 ground connection; The high frequency port of duplexer 400 is by C5 ground connection.
Described the second low frequency matching network 302 comprises the 8th capacitor C 8;
Described the second high-frequency matching network 304 comprises the 9th capacitor C 9;
One end of described the first switch SW 1 connects low frequency receiving port RXL, connects simultaneously the low frequency port of duplexer 400 by described the 8th capacitor C 8; The other end ground connection of described the first switch SW 1;
During the low frequency signal emission, 1 conducting of the first switch SW; When low frequency signal received, the first switch SW 1 disconnected;
The end of described second switch SW2 connects high frequency receiving port RXG, connects simultaneously the high frequency port of duplexer 400 by described the 9th capacitor C 9; The other end ground connection of described second switch SW2;
During the high-frequency signal emission, second switch SW2 conducting; When high-frequency signal received, second switch SW2 disconnected.
Below in conjunction with Fig. 4 its operation principle is described:
When needs emission low frequency signal, low frequency signal amplifies it through low frequency amplifier 101, then by the L1 in the first low frequency matching network 201, C1, L2, C2 realizes conversion and the filtering harmonic wave of impedance, L3 in passing through duplexer 400, C3 arrives antenna ANT behind the L4; Because the high frequency channel C6 in the duplexer 400, C7, L7 are high impedance status under the Frequency of this low frequency signal, can ignore the impact of low frequency signal.The first switch SW 1 conducting this moment, with low frequency receiving port RXL, namely the left side pole plate of the 8th capacitor C 8 pulls down to ground, and this moment, C8 and C2 participated in coupling together.Therefore the second low frequency matching network 302(that receives on the path is C8) on the not impact of low frequencies path.
When low frequency signal is returned from antenna reception, the first switch SW 1 disconnects, low frequency signal passes through the L4 in the duplexer 400, C3, L3(C6 this moment, C7, L7 forms high impedance equally, can ignore the impact of low frequency signal), arrive low frequency receiving port RXL by the second low frequency matching network (being C8) again, SW1 disconnects, so SW1 is on not impact of low frequency signal.Simultaneously, low frequency amplifier 101 reception control signals, the state of realization conducting or cut-off obtains a Low ESR or high impedance, change the characteristic of the first low frequency matching network 301, the first low frequency matching network 301 is reduced the impact of the reception path of low frequency signal.
The reception of high-frequency signal and the operation principle of emission and low frequency signal are similar, do not repeat them here.
In embodiment illustrated in fig. 4, be radio frequency front-end device corresponding to two-frequency signal (low frequency and high frequency), the present invention corresponding to a kind of four frequency signals also provides at radio frequency front-end device, is specifically introduced below in conjunction with Fig. 5.
Referring to Fig. 5, this figure is radio frequency front-end device embodiment four schematic diagrames provided by the invention.
In the radio frequency front-end device that the present embodiment provides, the first switches set comprises the first switch SW 1 and the 3rd switch SW 3; Described second switch group comprises second switch SW2 and the 4th switch SW 4;
Described the first low frequency matching network 301 comprises the first inductance L 1, the second inductance L 2, the first capacitor C 1 and the second capacitor C 2; Described the first inductance L 1, the second inductance L 2, the first capacitor C 1 and the second capacitor C 2 are connected to low-pass network;
Described the first high-frequency matching network 303 comprises the 5th inductance L 5, the 6th inductance L 6, the 4th capacitor C 4 and the 5th capacitor C 5; Described the 5th inductance L 5, the 6th inductance L 6, the 4th capacitor C 4 and the 5th capacitor C 5 are connected to low-pass network;
Described the second low frequency matching network 302 comprises the 8th capacitor C 8 and the tenth capacitor C 10;
Described the second high-frequency matching network 303 comprises the 9th capacitor C 9 and the 11 capacitor C 11;
One end of described the first switch SW 1 connects the first low frequency receiving port RXL1, connects simultaneously the low frequency port of duplexer 400 by described the 8th capacitor C 8; The other end ground connection of described the first switch SW 1; One end of described the 3rd switch SW 3 connects the second low frequency receiving port RXL2, connects simultaneously the low frequency port of duplexer 400 by described the tenth capacitor C 10; The other end ground connection of described the 3rd switch SW 3;
During low frequencies, described the first switch SW 1 and the 3 equal conductings of the 3rd switch SW;
When the first low frequency receiving port RXL1 received signal, the first switch SW 1 disconnected 3 conductings of the 3rd switch SW;
When the second low frequency receiving port RXL2 receives signal, 1 conducting of the first switch SW, the 3rd switch SW 3 disconnects;
The end of described second switch SW2 connects the first high frequency receiving port RXG1, connects simultaneously the high frequency port of duplexer 400 by described the 9th capacitor C 9; The other end ground connection of described second switch SW2; One end of described the 4th switch SW 4 connects the second high frequency receiving port RXG2, connects simultaneously the high frequency port of duplexer 400 by described the 11 capacitor C 11; The other end ground connection of described the 4th switch SW 4;
When receiving low frequency signal, if the first low frequency receiving port RXL1 receives low frequency signal work, then SW1 disconnects, and the SW3 conducting pulls down to ground with the left side pole plate of C10, and signal can't arrive the second low frequency receiving port RXL2 by C10.Low frequency signal arrives the first low frequency receiving port RXL1 by C8.If the second low frequency receiving port RXL2 work, then SW1 conducting, SW3 disconnects, and the left pole plate of C8 is pulled down to ground, and low frequency signal can't arrive the first low frequency receiving port RXL2, and low frequency signal arrives the second low frequency receiving port RXL2 by C10.
During high-frequency emission, described second switch SW2 and the 4 equal conductings of the 4th switch SW;
When the first high frequency receiving port RXG1 received signal, second switch SW2 disconnected, 4 conductings of the 4th switch SW;
When the second high frequency receiving port RXG2 receives signal, second switch SW2 conducting, the 4th switch SW 4 disconnects.
In like manner, it is similar that high-frequency signal transmits and receives the flow process that path and low frequency signal transmit and receive, and do not repeat them here.
Need to prove, when receiving and sending for low frequency signal, the second switch SW2 of front end and the on off state of the 4th switch SW 4 can be controlled, because the buffer action of duplexer 400, the signal of low frequency end and front end can not interfere with each other.In like manner, when receiving and sending for high-frequency signal, the first switch SW 1 of low frequency end and the on off state of the 3rd switch SW 3 can be controlled.
Thereby this embodiment can realize the switching of four frequencies.
The present invention also provides another four radio frequency front-end device that frequently switch, and referring to Fig. 6, this figure is radio frequency front-end device embodiment five schematic diagrames provided by the invention.
The radio frequency front-end device that the present embodiment provides, described the first switches set comprise the first switch SW 1, the 5th switch SW 1a and the 6th switch SW 1b; Described second switch group comprises second switch SW2, minion pass SW2a and the 8th switch SW2b;
Described the first low frequency matching network comprises the first inductance L 1, the second inductance L 2, the first capacitor C 1 and the second capacitor C 2; Described the first inductance L 1, the second inductance L 2, the first capacitor C 1 and the second capacitor C 2 are connected to low-pass network;
Described the first high-frequency matching network comprises the 5th inductance L 5, the 6th inductance L 6, the 4th capacitor C 4 and the 5th capacitor C 5; Described the 5th inductance L 5, the 6th inductance L 6, the 4th capacitor C 4 and the 5th capacitor C 5 are connected to low-pass network;
Described the second low frequency matching network comprises the 14 capacitor C 14;
Described the second high-frequency matching network comprises the 15 capacitor C 15;
One end of described the first switch SW 1 connects the first low frequency receiving port RXL1 and is connected the 6th switch SW 1b and connects the second low frequency receiving port RXL2 by the 5th switch SW 1a respectively, connects simultaneously the low frequency port of duplexers by described the 14 capacitor C 14; The other end ground connection of described the first switch SW 1;
During low frequencies, 1 conducting of described the first switch SW, the 5th switch SW 1a and the 6th switch SW 1b state are any;
When the first low frequency receiving port RXL1 received signal, the first switch SW 1 disconnected, the 5th switch SW 1a conducting, and the 6th switch SW 1b disconnects;
When the second low frequency receiving port RXL2 received signal, the first switch SW 1 disconnected, and the 5th switch SW 1a disconnects, the 6th switch SW 1b conducting;
The end of described second switch SW2 closes SW2a by minion respectively and connects the first high frequency receiving port RXG1 and be connected the 8th switch SW2b and connect the second high frequency receiving port RXG2, simultaneously the high frequency port by described the 15 capacitor C 15 connection duplexers; The other end ground connection of described second switch SW2;
During high-frequency emission, described second switch SW2 conducting, the state of minion pass SW2a and the 8th switch SW2b is any;
When the first high frequency receiving port RXG1 received signal, second switch SW2 disconnected, and minion is closed the SW2a conducting, and the 8th switch SW2b disconnects;
When the second high frequency receiving port RXG2 received signal, second switch SW2 disconnected, and minion is closed SW2a and disconnected the 8th switch SW2b conducting.
The operation principle of the present embodiment is similar to the operation principle of embodiment shown in Figure 5, realizes equally the switching of four frequencies, does not repeat them here.
The embodiment of the invention also provides the duplexer of two kinds of different structures, is introduced respectively below in conjunction with accompanying drawing.
Referring to Fig. 7, this figure is duplexer embodiment one structure chart provided by the invention.
The duplexer that the present embodiment provides comprises: the 3rd inductance L 3, the 4th inductance L 4, the 3rd capacitor C 3, the 6th capacitor C 6, the 7th capacitor C 7 and the 7th inductance L 7;
One end of described the 3rd inductance L 3 connects the low frequency port of described duplexer, and the other end connects antenna port by described the 4th inductance L 4; The common port of the 3rd inductance L 3 and the 4th inductance L 4 is by the 3rd capacitor C 3 ground connection;
One end of described the 6th capacitor C 6 connects the high frequency port of described duplexer, and the other end connects antenna port by described the 7th capacitor C 7; The common port of the 6th capacitor C 6 and the 7th capacitor C 7 is by the 7th inductance L 7 ground connection.
Referring to Fig. 8, this figure is duplexer embodiment two structure charts provided by the invention.
The another kind of duplexer that the present embodiment provides comprises: the 8th inductance L 8, the 9th inductance L 9, the 12 capacitor C 12 and the 13 capacitor C 13;
One end of described the 8th inductance L 8 connects the low frequency port of described duplexer, and the other end is by described the 12 capacitor C 12; The antenna port of described duplexer is by described the 12 capacitor C 12 ground connection;
One end of described the 13 capacitor C 13 connects the high frequency port of described duplexer, and the other end is by described the 9th inductance L 9; The antenna port of described duplexer is by described the 9th inductance L 9 ground connection.
Need to prove, because duplexer is mainly used in realizing the synthetic of different frequency signals and distributes, the signal of the different frequency path by separately is synthesized together, be not subjected to the impact of other one road signal simultaneously.Duplexer among the above embodiment of the present invention is not limited to above two kinds.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Although the present invention discloses as above with preferred embodiment, yet is not to limit the present invention.Any those of ordinary skill in the art, do not breaking away from the technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention according to any simple modification, equivalent variations and the modification that technical spirit of the present invention is done above embodiment, all still belongs in the scope of technical solution of the present invention protection.
Claims (9)
1. radio frequency front-end device, it is characterized in that, comprising: low frequency amplifier, high-frequency amplifier, amplifier controller, the first low frequency matching network, the second low frequency matching network, the first high-frequency matching network, the second high-frequency matching network, duplexer, with the first switches set of low frequency signal collaborative work, with the second switch group of high-frequency signal collaborative work;
The input of described low frequency amplifier connects the low frequency signal input, and the output of low frequency amplifier connects the input of the first low frequency matching network, and the output of the first low frequency matching network connects the low frequency port of described duplexer; The antenna port of described duplexer connects antenna;
The input of described high-frequency amplifier connects the high-frequency signal input, and the output of high-frequency amplifier connects the input of the first high-frequency matching network, and the output of the first high-frequency matching network connects the high frequency port of described duplexer;
The low frequency port of described duplexer connects an end of described the second low frequency matching network, and the other end of the second low frequency matching network connects the low frequency receiving port, and described low frequency receiving port is by the first switches set ground connection;
The high frequency port of described duplexer connects an end of described the second high-frequency matching network, and the other end of the second high-frequency matching network connects the high frequency receiving port, and described high frequency receiving port is by second switch winding ground;
By conducting or the shutoff of controlling the switch in the first switches set, so that low frequency signal receives and the be independent of each other performance of low frequency signal of the first low frequency matching network and the second low frequency matching network during emission;
By conducting or the shutoff of the switch in the control second switch group, so that high-frequency signal receives and the be independent of each other performance of high-frequency signal of the first high-frequency matching network and the second high-frequency matching network during emission.
2. radio frequency front-end device according to claim 1 is characterized in that, described the first switches set and second switch group all are arranged in described amplifier controller.
3. radio frequency front-end device according to claim 1 is characterized in that, described the first switches set is arranged in described low frequency amplifier; Described second switch group is arranged in described high-frequency amplifier.
4. radio frequency front-end device according to claim 1 is characterized in that, described the first switches set, second switch group, amplifier controller, low frequency amplifier and high-frequency amplifier all are integrated on the same chip.
5. each described radio frequency front-end device is characterized in that according to claim 1-4, and described the first switches set comprises the first switch; Described second switch group comprises second switch;
Described the first low frequency matching network comprises the first inductance, the second inductance, the first electric capacity and the second electric capacity; Described the first inductance, the second inductance, the first electric capacity and the second electric capacity are connected to low-pass network;
Described the first high-frequency matching network comprises the 5th inductance, the 6th inductance, the 4th electric capacity and the 5th electric capacity; Described the 5th inductance, the 6th inductance, the 4th electric capacity and the 5th electric capacity are connected to low-pass network;
Described the second low frequency matching network comprises the 8th electric capacity;
Described the second high-frequency matching network comprises the 9th electric capacity;
One end of described the first switch connects the low frequency receiving port, connects simultaneously the low frequency port of duplexer by described the 8th electric capacity; The other end ground connection of described the first switch;
During the low frequency signal emission, the first switch conduction; When low frequency signal received, the first switch disconnected;
One end of described second switch connects the high frequency receiving port, connects simultaneously the high frequency port of duplexer by described the 9th electric capacity; The other end ground connection of described second switch;
During the high-frequency signal emission, the second switch conducting; When high-frequency signal received, second switch disconnected.
6. each described radio frequency front-end device is characterized in that according to claim 1-4, and described the first switches set comprises the first switch and the 3rd switch; Described second switch group comprises second switch and the 4th switch;
Described the first low frequency matching network comprises the first inductance, the second inductance, the first electric capacity and the second electric capacity; Described the first inductance, the second inductance, the first electric capacity and the second electric capacity are connected to low-pass network;
Described the first high-frequency matching network comprises the 5th inductance, the 6th inductance, the 4th electric capacity and the 5th electric capacity; Described the 5th inductance, the 6th inductance, the 4th electric capacity and the 5th electric capacity are connected to low-pass network;
Described the second low frequency matching network comprises the 8th electric capacity and the tenth electric capacity;
Described the second high-frequency matching network comprises the 9th electric capacity and the 11 electric capacity;
One end of described the first switch connects the first low frequency receiving port, connects simultaneously the low frequency port of duplexer by described the 8th electric capacity; The other end ground connection of described the first switch; One end of described the 3rd switch connects the second low frequency receiving port, connects simultaneously the low frequency port of duplexer by described the tenth electric capacity; The other end ground connection of described the 3rd switch;
During low frequencies, described the first switch and the equal conducting of the 3rd switch;
When the first low frequency receiving port received signal, the first switch disconnected, the 3rd switch conduction;
When the second low frequency receiving port receives signal, the first switch conduction, the 3rd switch disconnects;
One end of described second switch connects the first high frequency receiving port, connects simultaneously the high frequency port of duplexer by described the 9th electric capacity; The other end ground connection of described second switch; One end of described the 4th switch connects the second high frequency receiving port, connects simultaneously the high frequency port of duplexer by described the 11 electric capacity; The other end ground connection of described the 4th switch;
During high-frequency emission, described second switch and the equal conducting of the 4th switch;
When the first high frequency receiving port received signal, second switch disconnected, the 4th switch conduction;
When the second high frequency receiving port receives signal, the second switch conducting, the 4th switch disconnects.
7. each described radio frequency front-end device is characterized in that according to claim 1-4, and described the first switches set comprises the first switch, the 5th switch and the 6th switch; Described second switch group comprises second switch, minion pass and the 8th switch;
Described the first low frequency matching network comprises the first inductance, the second inductance, the first electric capacity and the second electric capacity; Described the first inductance, the second inductance, the first electric capacity and the second electric capacity are connected to low-pass network;
Described the first high-frequency matching network comprises the 5th inductance, the 6th inductance, the 4th electric capacity and the 5th electric capacity; Described the 5th inductance, the 6th inductance, the 4th electric capacity and the 5th electric capacity are connected to low-pass network;
Described the second low frequency matching network comprises the 14 electric capacity;
Described the second high-frequency matching network comprises the 15 electric capacity;
One end of described the first switch connects the first low frequency receiving port and is connected the 6th switch and connects the second low frequency receiving port by the 5th switch respectively, connects simultaneously the low frequency port of duplexer by described the 14 electric capacity; The other end ground connection of described the first switch;
During low frequencies, described the first switch conduction, the 5th switch and the 6th on off state are any;
When the first low frequency receiving port received signal, the first switch disconnected, the 5th switch conduction, and the 6th switch disconnects;
When the second low frequency receiving port received signal, the first switch disconnected, and the 5th switch disconnects, the 6th switch conduction;
One end of described second switch close to connect the first high frequency receiving port and is connected the 8th switch and connects the second high frequency receiving port by minion respectively, connects simultaneously the high frequency port of duplexer by described the 15 electric capacity; The other end ground connection of described second switch;
During high-frequency emission, described second switch conducting, the state of minion pass and the 8th switch is any;
When the first high frequency receiving port received signal, second switch disconnected, and minion is closed conducting, and the 8th switch disconnects;
When the second high frequency receiving port received signal, second switch disconnected, and minion is closed and disconnected the 8th switch conducting.
8. each described radio frequency front-end device is characterized in that according to claim 1-4, and described duplexer comprises: the 3rd inductance, the 4th inductance, the 3rd electric capacity, the 6th electric capacity, the 7th electric capacity and the 7th inductance;
One end of described the 3rd inductance connects the low frequency port of described duplexer, and the other end connects antenna port by described the 4th inductance; The common port of the 3rd inductance and the 4th inductance is by the 3rd capacity earth;
One end of described the 6th electric capacity connects the high frequency port of described duplexer, and the other end connects antenna port by described the 7th electric capacity; The common port of the 6th electric capacity and the 7th electric capacity is by the 7th inductance ground connection.
9. each described radio frequency front-end device is characterized in that according to claim 1-4, and described duplexer comprises: the 8th inductance, the 9th inductance, the 12 electric capacity and the 13 electric capacity;
One end of described the 8th inductance connects the low frequency port of described duplexer, and the other end is by described the 12 electric capacity; The antenna port of described duplexer is by described the 12 capacity earth;
One end of described the 13 electric capacity connects the high frequency port of described duplexer, and the other end is by described the 9th inductance; The antenna port of described duplexer is by described the 9th inductance ground connection.
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| CN2012104538175A CN102938657A (en) | 2012-11-13 | 2012-11-13 | Radio frequency front end device |
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| CN2012104538175A CN102938657A (en) | 2012-11-13 | 2012-11-13 | Radio frequency front end device |
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| CN112073340A (en) * | 2019-05-24 | 2020-12-11 | 恩智浦美国有限公司 | Integrated circuit with physical layer interface circuit |
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| CN114759882A (en) * | 2022-05-06 | 2022-07-15 | 广东工业大学 | Dual-frequency coupling low-noise amplification circuit and amplifier |
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