CN110166068A - A kind of signal transmitting and receiving circuit - Google Patents
A kind of signal transmitting and receiving circuit Download PDFInfo
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- CN110166068A CN110166068A CN201810150506.9A CN201810150506A CN110166068A CN 110166068 A CN110166068 A CN 110166068A CN 201810150506 A CN201810150506 A CN 201810150506A CN 110166068 A CN110166068 A CN 110166068A
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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
- H04B1/02—Transmitters
- H04B1/04—Circuits
-
- 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
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/109—Means associated with receiver for limiting or suppressing noise or interference by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
-
- 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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
-
- 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
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
-
- 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
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0491—Circuits with frequency synthesizers, frequency converters or modulators
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transceivers (AREA)
Abstract
The embodiment of the present invention provides a kind of signal transmitting and receiving circuit, causes the system noise of communication system to increase to solve the problem of that the protection circuit of LNA in current communication system causes the link load of receiving path to increase.The signal transmitting and receiving circuit includes transmitting path, receiving path and duplexer.Wherein, receiving path is for receiving the reception signal from duplexer; including the tolerance amplifier for amplifying the reception signal; since tolerance amplifier can be able to bear Electro-static Driven Comb ESD signal or radio frequency leakage signal in receiving path in the case where unprotected circuit; so as to which the protection circuit of tolerance amplifier is no longer arranged in receiving path; reduce switch isolation, achievees the purpose that reduce total Insertion Loss.
Description
Technical field
The present invention relates to field of communication technology, in particular to a kind of signal transmitting and receiving circuit.
Background technique
In current LTE (Long Term Evolution, long term evolution) communication system, it is used in signal transmitting and receiving circuit
The receiving path of the reception signal of transmission antenna has LNA (Low Noise Amplifier, low-noise amplifier), and LNA can
The small-signal that antenna is received amplifies, and reduces noise jamming during amplified signal.
However existing LNA needs to increase protection circuit in the front end of LNA in use, for reducing being input to LNA's
Voltage value and/or signal power are to protect LNA not by high voltage and/or high-power signal corruption.This protection circuit is usual
LNA is protected or improved for realizing Electro-static Driven Comb (Electro-Static discharge, ESD) to transient state high-power signal
Ability to bear.However, the insertion loss of increased front-end protection circuit causes the link load of receiving path to increase, so as to cause
The system noise of signal transmitting and receiving circuit increases in communication system.
To sum up, the insertion loss of the front-end protection circuit of LNA leads to signal in the signal transmitting and receiving circuit of communication system at present
The link load of transmission circuit increases, and the noise of signal transmitting and receiving circuit is caused to increase.
Summary of the invention
The present invention provides a kind of signal transmitting and receiving circuit, is caused to inhibit by the insertion loss of the front-end protection circuit of LNA
Link load increase.
In a first aspect, the embodiment of the present application provides a kind of signal transmitting and receiving circuit, including transmitting path, receiving path.Its
In, transmitting path is used to for received transmission signal being transmitted to duplexer, and receiving path is for receiving the reception from duplexer
Signal, including tolerance amplifier, which, should in the case where unprotected circuit for amplifying the reception signal
Tolerance amplifier is able to bear ESD signal or radio frequency leakage signal in receiving path.Due to using energy in signal transmitting and receiving circuit
The tolerance amplifier for enough bearing the power of the voltage value of ESD signal and/or the radio frequency leakage signal of receiving path transmission, which is used as, to be connect
The amplifier in access is received, the setting protection circuit in receiving path is not needed, to reduce the insertion of signal transmitting and receiving circuit
Loss, reduces the noise of signal transmitting and receiving circuit and improves the sensitivity of signal transmitting and receiving circuit.
It further include duplexer in a kind of signal transmitting and receiving circuit provided by the embodiments of the present application in a kind of possible design,
For coupleeing antenna for transmitting path, and for coupleeing antenna for receiving path, sent to realize in transmitting path
Signal is sent by antenna, and realizes that the received reception signal of antenna is transmitted by receiving path.Optionally, institute
Stating signal transmitting and receiving circuit further includes the antenna.
In a kind of possible design, duplexer may include single pole multiple throw, circulator, filter.More than
Structure, a kind of signal transmitting and receiving circuit provided by the embodiments of the present application pass through among single pole multiple throw, circulator and filter one
Kind or a variety of combinations transmitting path and receiving path be connected to antenna, to realize the transmission for sending signal and receiving signal.
In a kind of possible design, if duplexer includes switch, circulator and filter, transmitting path and the ring
The first end of shape device connects, and the receiving path is connect by the switch with the second end of the circulator, the circulator
Third end connect with one end of the filter, the other end of the filter is connected to the antenna.
In a kind of possible design, if switch is single pole multiple throw, transmission circuit further includes protection access, then described
Receiving path is respectively connected to the different non-moving ends of the single pole multiple throw from one end of the protection access, and the protection is logical
Road other end ground connection, the moved end of the single pole multiple throw is connect with the second end of the circulator.Using the above structure,
Receiving path and protection access are respectively connected to two non-moving ends of single-pole double-throw switch (SPDT), thus when carrying out signal transmission, it can
To send interference of the signal for receiving path with reduction for single-pole double-throw switch (SPDT) connective protection access.
In a kind of possible design, the duplexer in a kind of signal transmitting and receiving circuit provided by the embodiments of the present application includes single
Knife multithrow switch and filter, the transmitting path and the receiving path are respectively connected to the difference of the single pole multiple throw
Non-moving end, the moved end of the single pole multiple throw are connect with one end of the filter, and the other end of the filter is connected to
The antenna.
In a kind of possible design, the single pole multiple throw in signal transmitting and receiving circuit is in the non-moving end that receiving path connects
There can also be isolation circuit between moved end, it is logical for preventing the signal corruption revealed from the moved end of single pole multiple throw from receiving
Tolerance amplifier in road.
In a kind of possible design, the duplexer in a kind of signal transmitting and receiving circuit provided by the embodiments of the present application includes double
Work filter, the transmitting path are connected to the first end of the duplexer filter, and the receiving path is connected to the duplex
The third end of the second end of filter, the duplexer filter is connect with the antenna.
In a kind of possible design, the duplexer in a kind of signal transmitting and receiving circuit provided by the embodiments of the present application is frequency division
Duplexer or time division duplex device.
In a kind of possible design, the tolerance amplifier in a kind of signal transmitting and receiving circuit provided by the embodiments of the present application is
Gallium nitride amplifier reaches good to improve the voltage tolerance and power tolerance for being resistant to amplifier in receiving path
Good tolerance effects.
In a kind of possible design, the transmitting path includes power amplifier and/or upper frequency mixer, wherein the function
For sending signal described in power amplification, which is used for the frequency for sending signal from first frequency rate amplifier
Second frequency is converted to, the first frequency is less than the second frequency.
In a kind of possible design, the receiving path further includes down-conversion mixer, for by it is described receive signal frequency
Rate is the 4th frequency from third frequency conversion, and the third frequency is greater than the 4th frequency.
In a kind of possible design, the tolerance amplifier in a kind of signal transmitting and receiving circuit provided by the embodiments of the present application is
Low-noise amplifier, to realize the noise reduction for receiving signal while amplifying the reception signal.
Second aspect, the embodiment of the present application provide a kind of processing circuit, the processing circuit and above-mentioned first aspect or the
Signal transmitting and receiving circuit in any possible design of one side is connected, for generating the transmission signal and being supplied to described
Signal transmitting and receiving circuit, and receive the reception signal from signal transmitting and receiving circuit and handle the reception signal.
The third aspect, the embodiment of the present application provide a kind of communication equipment, including first aspect or first aspect as before
Any possible design in signal transmitting and receiving circuit, and include the processing circuit such as second aspect before.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of communication system where a kind of signal transmitting and receiving circuit provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram (one) of signal transmitting and receiving circuit provided in an embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram (two) of signal transmitting and receiving circuit provided in an embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram (three) of signal transmitting and receiving circuit provided in an embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram (one) of switch isolation circuit provided in an embodiment of the present invention；
Fig. 6 is a kind of structural schematic diagram (two) of switch isolation circuit provided in an embodiment of the present invention；
Fig. 7 is a kind of structural schematic diagram (three) of switch isolation circuit provided in an embodiment of the present invention；
Fig. 8 is a kind of structural schematic diagram (four) of signal transmitting and receiving circuit provided in an embodiment of the present invention；
Fig. 9 is a kind of structural schematic diagram of communication equipment provided in an embodiment of the present invention.
Specific embodiment
In order to keep the purposes, technical schemes and advantages of the application clearer, below in conjunction with attached drawing to the application make into
One step it is described in detail.
The embodiment of the present invention provides signal transmitting and receiving circuit in a kind of communication system, to inhibit by signal transmitting and receiving circuit
Link load caused by the protection circuit of LNA increases.It should be noted that signal transmitting and receiving circuit described in the embodiment of the present application, is communication
For carrying out the circuit of signal of communication transmitting-receiving in system, it is also transceiver, radio frequency transceiver or radio circuit, the transmission circuit packet
Transmitting path and receiving path are included, the tolerance amplifier in receiving path therein will be received after signal amplifies and be transmitted.Its
In, communication system here can be duplex communication system, including but not limited to tdd communication system and FDD (Frequency
Division Dual, frequency division duplex) communication system.
The applicable communication system of the embodiment of the present application can include but is not limited to: global system for mobile telecommunications (Global System
Of Mobile communication, GSM) system, CDMA (Code Division Multiple Access, CDMA)
System, wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) system, general packet
Wireless traffic (General Packet Radio Service, GPRS), long term evolution (Long Term Evolution, LTE)
System, LTE frequency division duplex (Frequency Division Duplex, FDD) system, LTE time division duplex (Time Division
Duplex, TDD), Universal Mobile Communication System (Universal Mobile Telecommunication System, UMTS),
Global interconnection inserting of microwave (Worldwide Interoperability for Microwave Access, WiMAX) communication system
System, following the 5th generation (5th Generation, the 5G) system or new wirelessly (New Radio, NR) etc..
The communication system that the present embodiment is related to can be located in terminal device or wireless access network equipment, realize that signal is received
Hair.Terminal device can refer to the accession to terminal, user equipment, subscriber unit, subscriber station, movement station, mobile station, remote station, long-range
Terminal, mobile device, user terminal, terminal, wireless telecom equipment, user agent or user apparatus.Terminal device can also be
Cellular phone, wireless phone, session initiation protocol (Session Initiation Protocol, SIP) phone, wireless local
Loop (Wireless Local Loop, WLL) stands, personal digital assistant (Personal Digital Assistant, PDA),
It is handheld device with wireless communication function, the other processing equipments for calculating equipment or being connected to radio modem, vehicle-mounted
Equipment, wearable device, the Public Land Mobile Network network of terminal device or the following evolution in the following 5G network
Terminal device etc. in (Public Land Mobile Network, PLMN), the embodiment of the present application does not limit this.
Wireless access network equipment in the embodiment of the present application may include but be not limited to base station.The base station can be GSM or
Base station (Base Transceiver Station, BTS) in cdma system, is also possible to the base station in WCDMA system
(NodeB, NB) can also be the evolved base station (Evolutional NodeB, eNB or eNodeB) in LTE system, may be used also
To be the wireless controller under cloud Radio Access Network (Cloud Radio Access Network, CRAN) scene, or should
Base station can be relay station, access point, mobile unit, wearable device and base station or the following evolution in future 5G network
PLMN network in base station etc., for example, new wireless base station (new radio, NR), the embodiment of the present application do not limit.It is described
Base station can provide the covering of wireless area signal, and using one or more cells as terminal device service.
It should be noted that expression involved in the present embodiment " connection " refers to coupling comprising be connected directly or via
Other devices are indirectly connected to realize and be electrically connected.
As shown in Figure 1, communication system described in the embodiment of the present application can be communication system as shown in Figure 1, wherein base
It stands and carries out the transmitting-receiving of wireless signal between 110 and terminal 120, signal transmitting and receiving circuit described herein can be located at base station 110
In, for realizing the signal transmitting and receiving of base station 110, in addition, signal transmitting and receiving circuit can also be located in terminal 120 to realize terminal
120 signal transmitting and receiving.
The signal transmitting and receiving circuit in the communication system being related to the present embodiment is introduced below.As shown in Fig. 2, the signal
Transmission circuit 200 includes duplexer 201, transmitting path 202, receiving path 203 and antenna 204；Specifically, duplexer 201
For the transmitting path 202 and the receiving path 203 to be connected to the antenna 204.The transmitting path 202 is used
Signal is sent, the transmission signal is handled and the transmission signal is passed through into the duplexer in being received from the processing circuit 206 of rear end
201 are transmitted to the antenna 204.The receiving path 203, for handling and transmitting the received reception signal of the antenna 204
To the processing circuit 206 of rear end.The duplexer 201 can be frequency division duplex device or time division duplex device, for that will send signal
The antenna 204, which is coupled to, from transmitting path 202 or will receive signal is coupled to the receiving path from the antenna 204
203.The receiving path 203 includes the tolerance amplifier 205 of unprotected circuit, and the tolerance amplifier 205 is able to bear institute
The voltage value of the Electro-static Driven Comb signal transmitted in receiving path 203 is stated, and/or, the tolerance amplifier 205 is able to bear described
The power for the radio frequency leakage signal transmitted in receiving path, wherein the low noise that the tolerance amplifier 205 can be pressure resistance is put
Big device LNA, the transmission signal that the antenna 204 is used to transmit the transmitting path 202 by the duplexer 201 into
Row is sent, and for the received reception signal to be transmitted to the receiving path 203 by the duplexer 201.It should
200 rear end of signal transmitting and receiving circuit can connect for generating the processing circuit 206 for sending signal or processing reception signal.The processing
Circuit 206 may include processor or necessary logic circuit, for carrying out base band signal process or Digital Signal Processing.It is described
Processor can be baseband processor, digital signal processor, microprocessor or central processing unit etc..Alternatively, it handles
Circuit 206 may include except signal transmitting and receiving circuit 200.
In addition in an implementation, transmitting path 202 can also include power amplifier and/or upper frequency mixer, wherein power is put
Transmission signal of the big device for transmitting in power amplification transmitting path 202, upper frequency mixer are also modulator, are used for transmitting path
The frequency of the transmission signal transmitted in 202 is converted to second frequency from first frequency, and first frequency is less than the second frequency.It connects
Receiving access 203 can also include down-conversion mixer, also be demodulator, the frequency of the reception signal for will transmit in receiving path 203
Rate is the 4th frequency from third frequency conversion, and third frequency is greater than the 4th frequency.If transmitting path 202 includes power amplification
Device and upper frequency mixer, then the input terminal of frequency mixer can be connect with processing circuit 206, the output end and power amplifier of frequency mixer
Input terminal connection, the output end of power amplifier is connected to one end of duplexer 201.Alternatively, power amplifier and upper
The position of frequency mixer can be interchanged.In receiving path 203, the position of down-conversion mixer and the tolerance amplifier 205 is also can
With exchange.Typically, upper frequency mixer is used to baseband signal or intermediate-freuqncy signal being modulated to radiofrequency signal, and down-conversion mixer is then used for
Radiofrequency signal is demodulated into baseband signal or intermediate-freuqncy signal.
In signal transmitting and receiving circuit provided by the embodiments of the present application, due to using the amplification of high resistance characteristics in receiving path
Device no longer needs that the Insertion Loss for protecting circuit (such as front-end protection circuit) to reduce receiving path is additionally arranged in receiving path,
And effectively inhibit noise.The amplifier of the high resistance characteristics is a kind of high performance amplifier, can be in no protection circuit
In the case of maintain work normally.The amplifier itself is able to bear the ESD signal being likely to occur in normal work or radio frequency leakage
Signal.For example, amplifier G includes gallium nitride amplifier.
In an implementation, tolerance amplifier 205, which can be selected, is able to bear ESD signal, radio-frequency leakage signal or other types
High-power signal caused by voltage value LNA, specifically, the voltage value of ESD signal can achieve about 24V (volt), can
To select the higher LNA of pressure voltage as tolerance amplifier 205, for example, the LNA using pressure voltage greater than 200V is as such as Fig. 2 institute
The tolerance amplifier 205 in signal transmitting and receiving circuit 200 shown, to improve the voltage tolerance of electronic device in transmission circuit,
Pressure-resistant protection is carried out so as to no longer pass through front-end protection circuit, the noise of signal transmitting and receiving circuit is reduced and improves signal transmitting and receiving
The sensitivity of circuit.
For example, the producing cause of powerful radio frequency leakage signal may be the power in transmitting path 202 in Fig. 2
The transmission signal that amplifier (PA, Power Amplifier) issues enters receiving path 205 after the total reflection of antenna, or
Person is that the transmission signal that PA is issued directly directly leaks to receiving path or antenna by circulator (or other duplexers)
The transmission signal that received other antennas in same communication system are sent, these radiofrequency signals are possible to can be logical to receiving
LNA in road is damaged.In order to solve the above technical problems, in the embodiment of the present application, can use and be able to bear reception
The tolerance amplifier of the power of radio frequency leakage signal in access 203 is as the tolerance amplifier 205, to improve tolerance amplification
The powerful tolerance of device 205 prevents tolerance amplifier 205 by the high-power RFs leakage signal such as antenna total reflection signal
It destroys.Specifically, the power of above-mentioned radio frequency leakage signal is generally in 33dBm (decibel milliwatt) hereinafter, can select power resistance to
By the stronger LNA of ability as tolerance amplifier 205, for example, power tolerance value is put for the LNA greater than 33dBm as tolerance
Big device 205.
In one embodiment, tolerance amplifier 205 as shown in Figure 2 can be gallium nitride (GaN) amplifier, such as
GaN LNA.Since GaN LNA is able to bear the voltage of 100V or more, so as to using GaN LNA as letter as shown in Figure 2
Tolerance amplifier 205 in number transmission circuit 200 is to meet the protection requirement for ESD signal.In addition, GaN LNA can be held
By the radio-frequency power of 33dBm or more, required to meet protection.
In one embodiment, the duplexer 201 in signal transmitting and receiving circuit as shown in Figure 2 can be it is following a kind of or
A variety of combination: single pole multiple throw, circulator and filter.Specifically, transmitting path 202 and receiving path 203
Filter can be connected to by single pole multiple throw, and filter can connect to antenna；Transmitting path 202 and reception
Access 203 can also be connected to filter by circulator, and filter can connect to antenna；Transmitting path 202 and
Receiving path 203 can also be connected directly to duplexer filter, and duplexer filter can connect to antenna.
As shown in figure 3, signal transmitting and receiving circuit 300 includes transmitting in a kind of embodiment provided in an embodiment of the present invention
Access 301, receiving path 302, duplexer 303, antenna 304 and processing circuit 313, Fig. 2 is corresponding before specifically referring to
The associated components of embodiment.Further, it is with the difference of Fig. 1, wherein duplexer 303 includes switch 305, circulator 306
With filter 307, the transmitting path 301 is connect with the first end of the circulator 306, and the receiving path 302 passes through institute
It states switch 305 to connect with the second end of the circulator 306, the third end of the circulator 306 and the one of the filter 307
End connection, the other end of the filter 307 are connected to the antenna 304.Wherein, transmitting path 301 may include upper PA
308, the receiving path 302 may include tolerance amplifier 309 and frequency mixer (or frequency demodulator) 310.It is receiving
In access 302, tolerance amplifier 309 may be implemented newly to receive signal amplification on the basis of bearing relatively high power signal, and by
Flourishing reception signal is further first mixed device 310 and does down coversion or mixing to generate frequency lower than the signal for receiving signal.Example
Reception signal as frequency mixer 310 receives is radiofrequency signal, and the signal of output can be base band or intermediate-freuqncy signal, for mentioning
Supply the processing circuit of rear end.
The corresponding embodiment of Fig. 3 can be adapted for tdd systems.In one embodiment, letter as shown in Figure 3
Switch 305 in number transmission circuit 300 can be single pole multiple throw, and signal transmitting and receiving circuit 300 further includes protection access 311.
For example, protection access 311 includes the resistance that a resistance value is 50 ohm.The receiving path 302 and the protection access 311
One end is respectively connected to the different non-moving ends of the single pole multiple throw 305, and the other end ground connection of the protection access 311 is single
The moved end of knife multithrow switch 305 is connect with one end of the circulator 306.In use, the single pole multiple throw 305 is used for
It is connected to the protection access 311 and the circulator when the antenna emits and sends signal, sends letter to emit in antenna
Number when avoid interference signal from being transmitted to receiving path 302 by single pole multiple throw 305.
As shown in figure 4, signal transmitting and receiving circuit 400 includes hair in another embodiment provided in an embodiment of the present invention
Penetrate access 401, receiving path 402, duplexer 403 and antenna 404.The difference is that, duplexer 403 includes single with Fig. 1
Knife multithrow switch 405 and filter 406, transmitting path 401 are respectively connected to the hilted broadsword with the receiving path 402 and throw out more
405 different non-moving ends are closed, the moved end of single pole multiple throw 405 is connect with one end of the filter 406, the filter
406 other end is connected to the antenna 404.Wherein, transmitting path 401 may include PA407, and the receiving path 402 can
To include tolerance amplifier 408 and frequency mixer (or demodulator) 409.When above-mentioned signal transmitting and receiving circuit 400 can be applied to
In division duplex communication system.In addition, not embodying processing circuit in Fig. 4, i.e., the described processing circuit is in signal transmitting and receiving circuit
Except 400.
In a kind of feasible embodiment, throwing out the hilted broadsword in such as Fig. 3 and signal transmitting and receiving circuit as shown in Figure 4 more
It closes, between the non-moving end for the single pole multiple throw that the moved end of single pole multiple throw and receiving path are connected, there is isolation electricity
Road, the isolation circuit can be made of the diode or field-effect tube of multiple strings and/or parallel connection, the isolation of the isolation circuit
The LNA in signal corruption receiving path not less than first threshold, for preventing driven end from revealing, wherein in isolation circuit
Diode can be PIN type diode (PIN diode) or other kinds of diode, and field-effect tube can be metal oxidation
Object semiconductor (Metal-Oxide Semiconductor MOS) pipe, is also possible to other kinds of field-effect tube.
It in one embodiment, can be by the way that the value of first threshold be arranged, so that reaching being all-trans for tolerance amplifier
It penetrates power and refers to the power in transmitting path not higher than the maximum power value that tolerance amplifier is able to bear, such as total reflection power
Performance number when the transmission signal that amplifier issues enters receiving path after the total reflection of antenna and reaches tolerance amplifier.
Still by taking Fig. 3 as an example, if the output power of PA308 is 37dB when sending signal, sending signal peak-to-average ratio is
8dB, the filter loss of circulator 306 are 0.25dB, and the loss of filter 307 is 0.75dB, then can determine by calculating
The peak signal that PA308 is issued is 43dB by the power peak that signal transmitting and receiving circuit leaks to single pole multiple throw 205, in order to
The power peak for reaching LNA309 is set to be not higher than the maximum power value that LNA309 is able to bear, for example, 33dBm, the isolation electricity
The isolation on road should be not less than 10dB, can be 10dB with preset first threshold value.
In an implementation, in the case where the isolation of isolation circuit is not less than first threshold, in order to reduce isolation circuit
Insertion loss only can constitute isolation circuit by concatenated diode, or can reduce the electronics for including in isolation circuit
Number of devices.
The set-up mode for several isolation circuits of illustrating below:
Mode one
As shown in figure 5, the isolation circuit 500 of single pole multiple throw is in the moved end of single pole multiple throw 501 and receiving path
It include multiple concatenated diodes: first diode 503, the second diode 504 and the three or two between the non-moving end 502 of connection
Pole pipe 505, the cathode of the first diode 503 are connected to the non-moving end 502 of receiving path connection, first diode 503
Anode is connected to the cathode of the second diode 504, and the anode of the second diode 504 is connected to the cathode of third diode 505, the
The anode of three diodes 505 is connected to the moved end 501 of single pole multiple throw, since the tolerance amplifier in receiving path can be held
The voltage value received is improved, and can only pass through concatenated first diode 503, the second diode 504 and third diode
505 are used as isolation circuit, do not need the diode of any ground connection.Furthermore it is possible to change the quantity of concatenated diode, change every
Isolation from circuit 500, so that first threshold of the isolation of isolation circuit 500 not less than isolation circuit in transmission circuit.
Mode two
As shown in fig. 6, the isolation circuit 600 of single pole multiple throw is in the moved end of single pole multiple throw 601 and receiving path
Between the non-moving end 602 of connection include multiple concatenated field-effect tube: first time field-effect tube 603, the second field-effect tube 604 with
And third field-effect tube 605, the first field-effect tube 603, the second field-effect tube 604 and third field-effect tube 605 can be gold
Belong to oxide semiconductor tube, wherein the drain electrode of the first field-effect tube 603 be connected to receiving path connect non-moving end 602, first
The source electrode of field-effect tube 603 is connected to the drain electrode of the second field-effect tube 604, the source electrode of the second field-effect tube 604 is connected to third
The drain electrode of field-effect tube 605, the source electrode of third field-effect tube 605 are connected to the moved end 601 of single pole multiple throw, the first field-effect
The grid of pipe 603, the second field-effect tube 604 and third field-effect tube 605 is connected to the same constant voltage Vc, due to connecing
The voltage value that the tolerance amplifier in access is able to bear is received to be improved, it can be only by concatenated field-effect tube as isolation
Field-effect tube of the circuit without ground connection is arranged.Wherein it is possible to change the quantity of concatenated field-effect tube to change isolation electricity
The isolation on road 500, so that first threshold of the isolation of isolation circuit 600 not less than isolation circuit in transmission circuit.
Mode three
As shown in fig. 7, the isolation circuit 700 of single pole multiple throw is in the moved end of single pole multiple throw 701 and receiving path
Between the non-moving end 702 of connection include multiple series and parallels field-effect tube: the first field-effect tube 703, the second field-effect tube 704,
Third field-effect tube 705 and the 4th field-effect tube 706, wherein the source electrode of the first field-effect tube 703, the second field-effect tube 704
Drain electrode be connected to the moved end 701 of single pole multiple throw, the drain electrode of the first field-effect tube 703 is connected to third field-effect tube 705
Source electrode, the second field-effect tube 704 source electrode ground connection, the drain electrode of third field-effect tube 705 be connected to receiving path connect not
The source electrode of moved end 702, the 4th field-effect tube 706 is grounded and drains and connect with the source electrode of third field-effect tube 705, furthermore it is possible to
The grid of first field-effect tube 703 and third field-effect tube 705 is connected to the same constant voltage Vc1, and second is imitated
Should the grid connection of pipe 704 and the 4th field-effect tube 706 refer to the same constant voltage Vc2, since the tolerance in receiving path is put
The voltage value that big device is able to bear is improved, can be by the field-effect tube of series and parallel as isolation circuit.It can change string
The quantity of the field-effect tube of connection is to change the isolation of isolation circuit 700, so that the isolation of isolation circuit 700 is not less than transmitting-receiving
The first threshold of isolation circuit in circuit.
Using above method, to isolation circuit of the single pole multiple throw between the non-moving end that receiving path connects and moved end
Insertion loss and isolation limited, to limit the insertion loss of isolation circuit, prevent the insertion loss of isolation circuit
The excessive noise for causing signal transmitting and receiving circuit is excessive and sensitivity is too low.
As shown in figure 8, signal transmitting and receiving circuit 800 includes hair in another embodiment provided in an embodiment of the present invention
Penetrate access 801, receiving path 802, duplexer 803 and antenna 804.The difference is that, duplexer 803 is duplex with Fig. 5
Filter, transmitting path 801 are connected to the first end of the duplexer filter, and the receiving path 802 is connected to the duplex
The second end of filter 803, the third end of duplexer filter 803 are also connect with the antenna 804, wherein transmitting path 801 can
To include PA805 and upper frequency mixer 808, the receiving path 802 may include tolerance amplifier 806 and frequency mixer (or
Person's demodulator) 807.In addition, in fig. 8, do not embody processing circuit, i.e., the described processing circuit signal transmitting and receiving circuit 800 it
Outside.
Above-mentioned signal transmitting and receiving circuit 800 can be applied to the signal transmitting and receiving circuit of frequency-division duplex communication system.Using the knot
Structure, receiving path 802 needs to be arranged the front-end protection circuit of tolerance amplifier 806 no longer to improve in signal transmitting and receiving circuit 800
It is resistant to the voltage and/or power tolerance of amplifier 806.
Based on above-mentioned signal transmitting and receiving circuit embodiments same idea, the embodiment of the present application also provides a kind of processing circuit,
Corresponding processing circuit in Fig. 2 or Fig. 3 is specifically referred to, which is connected to the receipts of signal described in the embodiment of the present application
Power Generation Road, the transmitting path for generating transmission signal and being supplied in the signal transmitting and receiving circuit, and for handling
State the reception signal of the receiving path transmission in signal transmitting and receiving circuit.
Based on above-mentioned signal transmitting and receiving circuit embodiments same idea, the embodiment of the present application also provides a kind of chip, the core
Piece is connected to signal transmitting and receiving circuit described in the embodiment of the present application, receives for generating to send signal and be supplied to the signal
Transmitting path in Power Generation Road, and the reception signal for handling the transmission of the receiving path in the signal transmitting and receiving circuit.It should
Chip may include foregoing processing circuit.
Based on above-mentioned signal transmitting and receiving circuit embodiments same idea, the embodiment of the present application also provides a kind of communication equipment,
Connect including the signal transmitting and receiving circuit in any possible design described in the embodiment of the present application, and with the signal transmitting and receiving circuit
The processing circuit connect.The processing circuit is used to generate the transmission signal and is supplied to the signal transmitting and receiving circuit, and receives
Reception signal from signal transmitting and receiving circuit simultaneously handles the reception signal.As shown in figure 9, the embodiment of the present application also provides one kind
Communication equipment 900 may include signal transmitting and receiving circuit 901 and processing circuit 902, wherein signal transmitting and receiving circuit 901 can have
Counter structure just like in Fig. 2, Fig. 3, Fig. 4, Fig. 8 in any figure, processing circuit 902 can be central processing unit list
Member, general processor, digital signal processor, specific integrated circuit, field programmable gate array or other programmable logic
Device, transistor logic, hardware component or any combination thereof.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (13)
1. a kind of signal transmitting and receiving circuit, which is characterized in that the transmission circuit includes transmitting path and receiving path:
The transmitting path sends signal for receiving, and the transmission signal is transmitted to duplexer；
The receiving path, for receiving the reception signal from the duplexer, wherein the receiving path includes that tolerance is put
Big device, the tolerance amplifier is for amplifying the reception signal；
The tolerance amplifier can bear at least one of following in the case where unprotected circuit: Electro-static Driven Comb ESD signal or
Radio frequency leakage signal.
2. signal transmitting and receiving circuit as described in claim 1, which is characterized in that further include the duplexer, be used for from the hair
It penetrates access and receives the transmission signal, and the transmission signal is sent to antenna, and for from described in antenna reception
Signal is received, and the reception signal is sent to the receiving path.
3. signal transmitting and receiving circuit as claimed in claim 2, which is characterized in that the duplexer includes at least one of the following: list
Knife multithrow switch, circulator or filter.
4. signal transmitting and receiving circuit as claimed in claim 3, which is characterized in that the duplexer includes switch, circulator and filter
Wave device；
The transmitting path is connect with the first end of the circulator；
The receiving path is connect by the switch with the second end of the circulator；
The third end of the circulator is connect with one end of the filter；
The other end of the filter is connected to the antenna.
5. signal transmitting and receiving circuit as claimed in claim 4, which is characterized in that the switch is single pole multiple throw, the receipts
Power Generation Road further includes protection access；
The receiving path is respectively connected to the different non-moving ends of the single pole multiple throw, institute from one end of the protection access
State protection access other end ground connection；
The moved end of the single pole multiple throw is connect with the second end of the circulator.
6. signal transmitting and receiving circuit as claimed in claim 3, which is characterized in that the duplexer includes single pole multiple throw and filter
Wave device；
The transmitting path is respectively connected to the different non-moving ends of the single pole multiple throw from the receiving path；
The moved end of the single pole multiple throw is connect with one end of the filter；
The other end of the filter is connected to the antenna.
7. such as signal transmitting and receiving circuit described in claim 5 or 6, which is characterized in that the single pole multiple throw includes isolation electricity
Road, the isolation circuit are located at the moved end and between the non-moving ends of receiving path connection.
8. signal transmitting and receiving circuit as claimed in claim 3, which is characterized in that the duplexer includes duplexer filter；
The transmitting path is connected to the first end of the duplexer filter, and the receiving path is connected to the duplexer filter
Second end, the third end of the filter is connect with the antenna.
9. the signal transmitting and receiving circuit as described in claim 3-8 is any, which is characterized in that the duplexer be frequency division duplex device or
Time division duplex device.
10. the signal transmitting and receiving circuit as described in claim 1-9 is any, which is characterized in that the tolerance amplifier is gallium nitride
Amplifier.
11. the signal transmitting and receiving circuit as described in claim 1-10 is any, which is characterized in that the transmitting path include such as down toward
One item missing:
Power amplifier, the power amplifier is for sending signal described in power amplification；Or
Upper frequency mixer, for the frequency for sending signal to be converted to second frequency from first frequency, the first frequency is small
In the second frequency.
12. the signal transmitting and receiving circuit as described in claim 1-11 is any, which is characterized in that the receiving path further include:
Down-conversion mixer, for from third frequency conversion being the 4th frequency by the frequency for receiving signal, the third frequency is big
In the 4th frequency.
13. signal transmitting and receiving circuit as claimed in claim 1, which is characterized in that the tolerance amplifier includes low noise
Acoustic amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810150506.9A CN110166068A (en) | 2018-02-13 | 2018-02-13 | A kind of signal transmitting and receiving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810150506.9A CN110166068A (en) | 2018-02-13 | 2018-02-13 | A kind of signal transmitting and receiving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110166068A true CN110166068A (en) | 2019-08-23 |
Family
ID=67635369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810150506.9A Pending CN110166068A (en) | 2018-02-13 | 2018-02-13 | A kind of signal transmitting and receiving circuit |
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| CN (1) | CN110166068A (en) |
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