CN104579390A - ASK (Amplitude Shift Keying) wireless receiver and automatic gain control method thereof - Google Patents
ASK (Amplitude Shift Keying) wireless receiver and automatic gain control method thereof Download PDFInfo
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Abstract
The invention relates to an electronic device and discloses an ASK (Amplitude Shift Keying) wireless receiver and an automatic gain control method thereof. The ASK wireless receiver comprises a first-stage feed-forward automatic gain control module and a second-stage feedback automatic gain control module, wherein the first-stage feed-forward automatic gain control module is used for carrying out automatic gain control on a low-noise amplifier (LNA) according to the amplitude of the radio-frequency signal received from an antenna, and the low-noise amplifier (LNA) is used for amplifying a radio-frequency signal; the second-stage feedback automatic gain control module is used for dynamically adjusting the amplifier gain of a useful signal according to control voltage generated by the rear stage, and outputting a modulation signal with relatively constant amplitude, and the useful signal is output by the LNA and obtained after an interference signal is filtered out through a band-pass filter; the output modulation signal is demodulated through a complex demodulator; the control voltage is obtained according to the demodulated signal. According to the ASK wireless receiver, the whole link gain of the receiver can be quickly adjusted, and the continuous linear adjustment to the link gain can be realized at the same time.
Description
Technical field
The present invention relates to electronic device, particularly a kind of for the fast gain regulating circuit in ASK wireless receiver.
Background technology
ASK(Amplitude Shift Keying, amplitude-shift keying) wireless telecommunication system is widely used in remote keyless and controls, the fields such as gate inhibition, has that cost is low, low in energy consumption, the simple feature of long transmission distance, application circuit.The ASK wireless control system of complete set comprises transmitter and receiver two parts, and as shown in Figure 1, these two parts independently exist usually.In the gain control structure of existing ASK wireless receiver, there are two kinds of main implementations:
(1) based on the feedback controling mode of peakvalue's checking (PKD), as shown in Figure 2.ASK radio receiver architecture based on peakvalue's checking comprises low noise amplifier (Low Noise Amplifier, be called for short " LNA "), frequency mixer, filter, variable gain amplifier (Variable Gain Amplifier, be called for short " VGA "), peak detector (PKD) and automatic gain controller (Automatic Gain Control, be called for short " AGC "), wherein AGC and VGA, Mixer(frequency mixer) form gain control circuit.This gain control structure be by demodulation after signal be input in AGC module, AGC module is by comparing restituted signal amplitude size and preset value, thus the discharge and recharge of control capacitance C1, and the gain of voltage on electric capacity C1 directly control VGA and frequency mixer, thus realize automatic growth control.If amplitude exceedes preset value, discharged by control capacitance C1, the voltage on electric capacity C1 reduces, and link gain reduces; Otherwise it is then anti-.
(2) based on the feedback controling mode of received signal strength indicator (RSSI), as shown in Figure 3.The program adopts closed-loop feedback manner ride gain equally, and what its gain controlled acts on LNA, and the loop of this gain control structure comprises LNA, Mixer(frequency mixer), VGA, RSSI and AGC module.RSSI is input in AGC after receiving signal, and the signal received in AGC module and preset value compare, thus determines the gain size of LNA, if RSSI signal is greater than preset value, then LNA is set to low gain mode; Otherwise it is then anti-.
But when the distance of transmitter and receiver changes, the signal that receiver antenna can be responded to will synchronously change.If quick adjustment can not be carried out to whole receiver link gain, receiver signal will be caused to block (signal is excessive) and maybe cannot receive (signal is too little), and then cause data packetloss.In scheme (1), it is longer that this gain controls the structure ring road response time, can not tracking in time carrier amplitude change, thus obstruction maybe cannot receive to cause receiver to occur when input signal saltus step.
Equally, in scheme (2), the program also adopts closed-loop feedback manner ride gain, and its gain control makes and is used for LNA, and the loop of this gain control structure comprises LNA, Mixer, AMP(amplifier), RSSI and AGC module, included by this loop, module is many, control time is long, is unfavorable for quick response.
Meanwhile, in scheme (2), only there is the discrete gain mode of large-and small-signal two kinds in whole link, is unfavorable for that the continuously linear of link gain is reconciled.
Summary of the invention
The object of the present invention is to provide a kind of ASK wireless receiver and auto gain control method thereof, make ASK wireless receiver can respond the situation of large-signal or small-signal fast, can realize regulating the continuously linear of link gain simultaneously.
For solving the problems of the technologies described above, the invention provides a kind of ASK wireless receiver, comprising: first order feedforward automatic growth control module and second level feedback automatic growth control module;
Wherein, described first order feedforward automatic growth control module, according to the amplitude of the radiofrequency signal received from antenna, carries out automatic growth control to the low noise amplifier LNA for carrying out low noise amplification to described radiofrequency signal;
Described second level feedback automatic growth control module dynamically adjusts the gain amplifier of the useful signal after band pass filter filtering interference signals that described LNA exports according to the control voltage that rear class produces, the modulation signal of output amplitude relative constancy; The modulation signal of described output carries out demodulation by complex demodulator; Described control voltage obtains according to the signal after described demodulation.
Present invention also offers a kind of auto gain control method of ASK wireless receiver, comprise following steps:
From antenna received RF signal;
First order feedforward automatic growth control module according to described in the amplitude of radiofrequency signal that receives, automatic growth control is carried out to the low noise amplifier LNA for carrying out low noise amplification to described radiofrequency signal;
Second level feedback automatic growth control module dynamically adjusts the gain amplifier of the useful signal after band pass filter filtering interference signals that described LNA exports according to the control voltage that rear class produces, the modulation signal of output amplitude relative constancy; The modulation signal of described output carries out demodulation by complex demodulator; Described control voltage obtains according to the signal after described demodulation.
Embodiment of the present invention in terms of existing technologies, is realized the feedforward automatic growth control of radio-frequency front-end, feeds back by the second level feedback automatic growth control that automatic growth control module realizes intermediate-frequency section by first order feedforward automatic growth control module.Because first order feedforward automatic growth control module can when the amplitude of input signal exceedes certain limit, automatically LNA is switched to low gain mode, otherwise, when input signal amplitude is reduced to certain limit, automatically LNA is switched to high gain mode, whole process does not need rear class feedback signal, therefore greatly improves response speed, and this part plays coarse adjustment effect to whole link gain.And second level feedback automatic growth control module is that the control voltage produced according to rear class dynamically adjusts gain amplifier, fine tuning effect is played to whole link gain.The automatic adjustment of fast gain is achieved by two links, ASK wireless receiver can be regulated whole receiver link gain rapidly, the situation of quick response large-signal or small-signal, can realize regulating the continuously linear of link gain simultaneously.
In addition, first order feedforward automatic growth control module is automatic gain controller AGC; Second level feedback automatic growth control module is variable gain amplifier VGA.Because AGC and VGA is all existing ripe devices, ensure that the feasibility of embodiment of the present invention.
In addition, the input of second level feedback automatic growth control module is connected with the output of band pass filter; The output of described second level feedback automatic growth control module is connected with described complex demodulator; The output signal of described complex demodulator is input in current controller, and this current controller directly controls the discharge and recharge of an electric capacity; Described control voltage is the voltage on described electric capacity.Because intermediate frequency feedback automatic gain control circuit is by VGA, complex demodulator, current controller and electric capacity C are formed together, and the signal that complex demodulator detects is input in current controller, the direct control capacitance C discharge and recharge of current controller, the voltage on electric capacity C is applied directly in VGA.And communication data coding theory is known, last solution recalls the theoretical probability of " high level ", " low level " of data should be identical, therefore can control the opening and closing of the charge pump in current controller with this signal.If VGA gain is excessive, average demodulation high level probability out will be excessive, and therefore now charge pump control capacitance electric discharge, reduces its voltage, thus reduce VGA gain until stable; Otherwise if VGA gain is too small, then demodulation " low level " probability out will be less than normal, and now charge pump control capacitance C charges, and makes electric capacity C voltage raise, thus improve VGA gain until stable.Therefore, the closed gain control loop based on above-mentioned principle design effectively in conjunction with the gain of demodulation module control VGA, can ensure that intermediate frequency feedback automatic gain control circuit can play fine tuning effect to whole link gain.
Accompanying drawing explanation
Fig. 1 is ASK wireless control system structural representation of the prior art;
Fig. 2 is the feedback controling mode schematic diagram based on peakvalue's checking of the prior art;
Fig. 3 is the feedback controling mode schematic diagram based on received signal strength indicator of the prior art;
Fig. 4 is the structural representation of the ASK wireless receiver according to first embodiment of the invention;
Fig. 5 is the electrical block diagram according to the LNA in second embodiment of the invention;
Fig. 6 is according to the AGC part-structure schematic diagram in second embodiment of the invention;
Fig. 7 is according to the VGA structural representation in second embodiment of the invention;
Fig. 8 is according to the complex demodulator electrical block diagram in second embodiment of the invention;
Fig. 9 is according to the current controller structural representation in second embodiment of the invention;
Figure 10 is the auto gain control method flow chart of the ASK wireless receiver according to third embodiment of the invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the embodiments of the present invention are explained in detail.But, persons of ordinary skill in the art may appreciate that in each execution mode of the present invention, proposing many ins and outs to make reader understand the application better.But, even without these ins and outs with based on the many variations of following execution mode and amendment, each claim of the application technical scheme required for protection also can be realized.
First execution mode of the present invention relates to a kind of ASK wireless receiver, concrete structure as shown in Figure 4, this ASK wireless receiver comprises: antenna, low noise amplifier (LNA), automatic gain controller (AGC), frequency mixer (Mixer), phase-locked loop (Phase Locked Loop, be called for short " PLL "), band pass filter (band-pass filter, be called for short " BPF "), variable gain amplifier (VGA), complex demodulator, current controller, electric capacity C and clock data restorer.
Wherein, AGC, as first order feedforward automatic growth control module, according to the amplitude of the radiofrequency signal received from antenna, carries out automatic growth control to carrying out low noise amplification LNA for radio frequency signal.As shown in Figure 4, the input of this AGC is connected with antenna, and output is connected with described LNA.This AGC and LNA constitutes the feedforward automatic gain control circuit of radio frequency part, and when the amplitude of input signal (namely from the radiofrequency signal that antenna receives) exceedes preset value, LNA is switched to low gain mode by AGC; Otherwise when input signal amplitude is lower than preset value, LNA is switched to high gain mode by AGC.Whole process does not need rear class feedback signal, is conducive to improving response speed, and the automatic growth control of this radio frequency part plays coarse adjustment effect to whole link gain.
In the present embodiment, the output termination frequency mixer of LNA, the output of the another one input termination phase-locked loop of frequency mixer, the input of the output tape splicing bandpass filter of frequency mixer.That is, the radiofrequency signal that antenna detection arrives by LNA is amplified, and is input in Mixer, and the another one input of Mixer is that phase-locked loop (PLL), PLL produce lower carrier signal required for mixing.Produced signal is input in band pass filter (BPF) by Mixer, and BPF can interference signal outside filtering useful signal frequency range, and the signal in channel is input in next stage VGA.VGA is as second level feedback automatic growth control module, the control voltage produced according to rear class dynamically adjusts the gain amplifier of the useful signal after band pass filter filtering interference signals, the modulation signal of output amplitude relative constancy, the modulation signal of described output carries out demodulation by complex demodulator; Control voltage obtains according to the signal after described demodulation.
Specifically, the input of VGA is connected with the output of band pass filter, and output is connected with complex demodulator, and the output signal of complex demodulator is input in current controller, this current controller directly controls the discharge and recharge of an electric capacity, and control voltage is the voltage on electric capacity.The output signal of complex demodulator is obtaining data-signal and clock signal after clock data restorer.
That is, VGA, complex demodulator, current controller and electric capacity C form the feedback automatic gain control circuit of intermediate-frequency section together.The signal that complex demodulator detects is input in current controller, and the direct control capacitance C discharge and recharge of current controller, the voltage on electric capacity C is applied directly in VGA.From communication data coding theory, last solution recalls the theoretical probability of " high level ", " low level " of data should be identical, therefore can control the opening and closing of the charge pump in current controller with this signal.If VGA gain is excessive, average demodulation high level probability out will be excessive, and therefore now charge pump control capacitance electric discharge, reduces its voltage, thus reduce VGA gain until stable; Otherwise if VGA gain is too small, then demodulation " low level " probability out will be less than normal, and now charge pump control capacitance C charges, and makes electric capacity C voltage raise, thus improve VGA gain until stable.Closed gain control loop based on above-mentioned principle design can effectively in conjunction with the gain of demodulation module control VGA.This part plays fine tuning effect to whole link gain.
Therefore, in the present embodiment, the automatic adjustment of fast gain is achieved by two-stage gain-adjusted mechanism (the feedforward automatic gain control circuit of radio-frequency front-end and the feedback automatic gain control circuit of intermediate-frequency section), make ASK wireless receiver can respond the situation of large-signal or small-signal fast, can realize regulating the continuously linear of link gain simultaneously, effectively enhance the stability of design, more adapt to commercial Application.
And, adopt AGC as first order feedforward automatic growth control module, adopt VGA as second level feedback automatic growth control module.Because AGC and VGA is all existing ripe devices, ensure that the feasibility of embodiment of the present invention.
It is worth mentioning that, each module involved in present embodiment is logic module, and in actual applications, a logical block can be a physical location, also can be a part for a physical location, can also realize with the combination of multiple physical location.In addition, in order to outstanding innovative part of the present invention, the unit not too close with solving technical problem relation proposed by the invention is not introduced in present embodiment, but this does not show the unit that there is not other in present embodiment.
Second execution mode of the present invention relates to a kind of ASK wireless receiver.Second execution mode has done further refinement on the radix of the first execution mode, gives the concrete structure of the LNA in ASK wireless receiver, AGC, VGA, complex demodulator, current controller.
Specifically, the circuit structure of the LNA of gain switching is with as shown in Figure 5, wherein, RFI is the radiofrequency signal of input, RFOP, RFON are the radio-frequency differential signal exported, VCS1, VCS2 is folded tube M2, the bias voltage of M5, VB1, VB2 are amplifier tube M3, the DC offset voltage of M6, GCTL is gain switch-over control signal.
AGC part-structure in feedforward gain control circuit as shown in Figure 6, wherein, RFI is the radiofrequency signal of input, and GCTL is the gain control signal exported, VBI is the bias voltage of radiofrequency signal, VBC is the bias voltage of current source, and VBT is the threshold voltage of comparator, and the radiofrequency signal of input is after first order buffer memory, be input to rear class signal integration circuit, the equal threshold voltage that integrating circuit produces is input in comparator, compares with the threshold voltage VBT of setting, produces gain control signal.
VGA structure in feedback oscillator control circuit is (wherein any road in I, Q) as shown in Figure 7.Wherein, INM, INP are the differential signal of input, and OUTM, OUTP are the differential signal exported, and VREF is common-mode feedback reference voltage, and VC is gain-controlled voltage, and VBP is bias voltage, and dotted line frame is common-mode feedback part.
Complex demodulator circuit structure as shown in Figure 8, wherein, IP, IN, QP, QN is the orthogonal vector signal that VGA exports, after above-mentioned four road signals are input to MN5 ~ MN8, the electric current that MN2 produces comprises the constant DC component alternating current component relevant to input signal amplitude with another one, wherein direct current component can be offset by regulating the electric current of MN4, therefore only there is the electric current relevant to input signal amplitude in MP4 ~ MP9, above-mentioned electric current after OPA voltage to the shaping of current conversion and BUF, formation demodulated output signal DEM.
As shown in Figure 9, wherein, in current controller, DEM is the restituted signal of input to current controller structure, and IB is input reference current, and OUT is that charge and discharge electric current exports.When DEM is high level time, corresponding VGA now gain is comparatively large, and discharge paths MN1, MN14 open, capacitor discharge, and capacitance voltage declines; When DEM is low level time, corresponding VGA now gain is less, and charging paths MP13, MN18 open, capacitor charging, and capacitance voltage raises, and said process forms a complete closed-loop control.
It is worth mentioning that, the concrete structure of the LNA in present embodiment, AGC, VGA, complex demodulator, current controller, just a kind of concrete implementation, in actual applications, also can adopt the circuit structure of other equivalences, not repeat one by one at this.
Third embodiment of the invention relates to a kind of auto gain control method of ASK wireless receiver, and idiographic flow as shown in Figure 10.
In step 1001, ASK wireless receiver is from antenna received RF signal.
Then, in step 1002, first order feedforward automatic growth control module (as AGC), according to the amplitude of the radiofrequency signal received, carries out automatic growth control to the LNA carrying out low noise amplification for radio frequency signal.Specifically, when the amplitude of input signal (namely from the radiofrequency signal that antenna receives) exceedes preset value, LNA is switched to low gain mode by AGC; Otherwise when input signal amplitude is lower than preset value, LNA is switched to high gain mode by AGC.Whole process does not need rear class feedback signal, is conducive to improving response speed, and the automatic growth control of this radio frequency part plays coarse adjustment effect to whole link gain.
In step 1003, second level feedback automatic growth control module (as VGA) according to rear class the control voltage that produces dynamically adjust as described in the gain amplifier of the useful signal after band pass filter filtering interference signals that exports of LNA, the modulation signal of output amplitude relative constancy.The modulation signal of described output carries out demodulation by complex demodulator; Described control voltage obtains according to the signal after described demodulation.
Specifically, the radiofrequency signal after amplification is outputted to frequency mixer by LNA, and the another one input of frequency mixer receives the carrier signal of phase-locked loop output.Phase-locked loop produces lower carrier signal required for mixing.Produced signal is input to BPF by frequency mixer, by the interference signal outside BPF filtering useful signal frequency range, the signal in channel is input in VGA.VGA is as second level feedback automatic growth control module, the control voltage produced according to rear class dynamically adjusts the gain amplifier of the useful signal after band pass filter filtering interference signals, the modulation signal of output amplitude relative constancy, the modulation signal of described output carries out demodulation by complex demodulator.The output signal of complex demodulator also will be input in a current controller, and this current controller directly controls the discharge and recharge of an electric capacity, and control voltage is the voltage on electric capacity.
The opening and closing of the charge pump in the Data Control current controller demodulated by utilizing complex demodulator.If VGA gain is excessive, average demodulation high level probability out will be excessive, and therefore now charge pump control capacitance electric discharge, reduces its voltage, thus reduce VGA gain until stable; Otherwise if VGA gain is too small, then demodulation " low level " probability out will be less than normal, and now charge pump control capacitance C charges, and makes electric capacity C voltage raise, thus improve VGA gain until stable.Closed gain control loop based on above-mentioned principle design can effectively in conjunction with the gain of demodulation module control VGA.This part plays fine tuning effect to whole link gain.
Be not difficult to find, present embodiment is the embodiment of the method corresponding with the first execution mode, and present embodiment can be worked in coordination with the first execution mode and be implemented.The relevant technical details mentioned in first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the first execution mode.
Persons of ordinary skill in the art may appreciate that the respective embodiments described above realize specific embodiments of the invention, and in actual applications, various change can be done to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. an ASK wireless receiver, is characterized in that, comprises: first order feedforward automatic growth control module and second level feedback automatic growth control module;
Wherein, described first order feedforward automatic growth control module, according to the amplitude of the radiofrequency signal received from antenna, carries out automatic growth control to the low noise amplifier LNA for amplifying described radiofrequency signal;
Described second level feedback automatic growth control module dynamically adjusts the gain amplifier of that described LNA exports, after band pass filter filtering interference signals useful signal according to the control voltage that rear class produces, the modulation signal of output amplitude relative constancy; The modulation signal of described output carries out demodulation by complex demodulator; Described control voltage obtains according to the signal after described demodulation.
2. ASK wireless receiver according to claim 1, is characterized in that,
The input of described first order feedforward automatic growth control module is connected with antenna, and the output of described first order feedforward automatic growth control module is connected with described LNA.
3. ASK wireless receiver according to claim 2, is characterized in that,
Described first order feedforward automatic growth control module is automatic gain controller AGC.
4. ASK wireless receiver according to claim 1, is characterized in that,
The input of described second level feedback automatic growth control module is connected with the output of band pass filter; The output of described second level feedback automatic growth control module is connected with described complex demodulator;
The output signal of described complex demodulator is input in current controller, and this current controller directly controls the discharge and recharge of an electric capacity;
Described control voltage is the voltage on described electric capacity.
5. ASK wireless receiver according to claim 4, is characterized in that,
Described second level feedback automatic growth control module is variable gain amplifier.
6. ASK wireless receiver according to any one of claim 1 to 5, is characterized in that,
The output termination frequency mixer of described LNA, the output of the another one input termination phase-locked loop of described frequency mixer;
The input of band pass filter described in the output termination of described frequency mixer.
7. an auto gain control method for ASK wireless receiver, is characterized in that, comprises following steps:
From antenna received RF signal;
First order feedforward automatic growth control module according to described in the amplitude of radiofrequency signal that receives, automatic growth control is carried out to the low noise amplifier LNA for carrying out low noise amplification to described radiofrequency signal;
Second level feedback automatic growth control module dynamically adjusts the gain amplifier of the useful signal after band pass filter filtering interference signals that described LNA exports according to the control voltage that rear class produces, the modulation signal of output amplitude relative constancy; The modulation signal of described output carries out demodulation by complex demodulator; Described control voltage obtains according to the signal after described demodulation.
8. the auto gain control method of ASK wireless receiver according to claim 7, is characterized in that,
Described first order feedforward automatic growth control module is automatic gain controller AGC;
Described second level feedback automatic growth control module is variable gain amplifier.
9. the auto gain control method of ASK wireless receiver according to claim 7, is characterized in that, in the following manner, obtains described control voltage according to the signal after described demodulation:
By the output signal of current controller according to described complex demodulator, directly control the discharge and recharge of an electric capacity;
Described control voltage is the voltage on described electric capacity.
10. the auto gain control method of the ASK wireless receiver according to any one of claim 7 to 9, is characterized in that, also comprise following steps:
The output signal of described LNA is input to described band pass filter through frequency mixer;
The another one input of described frequency mixer receives the carrier signal of phase-locked loop output.
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| CN112803908A (en) * | 2021-04-09 | 2021-05-14 | 南京沁恒微电子股份有限公司 | Large dynamic rapid automatic gain control method in Bluetooth receiver and module thereof |
| CN112803908B (en) * | 2021-04-09 | 2021-07-13 | 南京沁恒微电子股份有限公司 | Large dynamic rapid automatic gain control method in Bluetooth receiver and module thereof |
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Effective date of registration: 20201028 Address after: Room 518, No.2, Lane 288, Shengrong Road, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai, 200120 Patentee after: Xiaxin Microelectronics (Shanghai) Co., Ltd Address before: 201203 Shanghai city Zuchongzhi road in Zhangjiang High Tech Park of Pudong New Area No. 2305 block B room 1102 Patentee before: SHANGHAI KUIXIN MICROELECTRONICS TECHNOLOGY Co.,Ltd. |