CN102545949A - Radio frequency amplitude keying demodulation circuit with large input dynamic range - Google Patents
Radio frequency amplitude keying demodulation circuit with large input dynamic range Download PDFInfo
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Abstract
The invention discloses a radio frequency amplitude keying demodulation circuit with large input dynamic range, which comprises an amplitude detection circuit, a Gaussian filter circuit, a peak detection circuit and two branches of difference amplitude keying demodulation circuits of a comparison circuit. The amplitude detection circuit is formed by a fixed gain amplifier with S poles in series connection and an amplitude detection and conversion circuit. Each branch of the amplitude keying demodulation circuits includes that input signals are amplified to i fuzzy amplitude keying signals through the amplitude detection circuit, the i fuzzy amplitude keying signals are added and converted into high-low voltage amplitude signals, high frequency components are filtered through the Gaussian filter circuit, the filtered signals pass through the peak detection circuit to obtain high-low average amplitude signals, and the average amplitude signals and the signals filtered by the Gaussian filter circuit are compared through the comparison circuit to obtain demodulation signals output by the radio frequency amplitude keying demodulation circuit. The radio frequency amplitude keying demodulation circuit with the large input dynamic range can be flexibly used for demodulating amplitude detection signals with modulation degree ranging from 0.5 to 0.9, thereby being capable of being applied to the front end of a radio frequency receiver with input signals reaching up to 60dB dynamic range.
Description
Background technology
In recent years along with the extensive use of intermittent low-speed rate product; Such as household safe; Management of gate, garage and Long-distance Control, short-distance wireless communication technology is used widely, and is applied to short-distance wireless communication technology amplitude keying modulation system and is more and more favored.Modulation is simple because the amplitude keying modulation system has, and system design is simple, and system power dissipation is low, and the error rate increases with the increase of signal propagation distance, so it is particularly suitable for the short-distance wireless communication occasion.
As everyone knows, different system has nothing in common with each other for the degree of depth of amplitude keying modulation, obviously; The demodulator that can only be applicable to a kind of modulation system can only satisfy a kind of specific system requirements, can not adapt to the concrete needs of different system, and conventional diode detection demodulation mode remolding sensitivity is lower simultaneously; Only be applicable to that generally requirement is lower; The perhaps very approaching application scenario of transceiver distance, on this structure with function on limitation, become the significant deficiency that limits its application.
The formation of traditional amplitude keying demodulator circuit comprises amplifying circuit, diode circuit, filter circuit, comparison circuit.There are many shortcomings in the demodulation of prior art amplitude keying: first; Because its receiving sensitivity depends mainly on the gain of its frontend amplifying circuit; The gain of its frontend amplifying circuit and the relation of sensitivity present exponential relationship simultaneously, bigger raising sensitivity need the greatly gain of its frontend amplifying circuit of increase, and because power consumption; Noises etc. have limited the gain of its frontend amplifying circuit can not be too big, so this just limits the detection of existing circuit structure for the high sensitivity input signal.The second, traditional design need add filter capacitor and inductance, and this has not only increased the difficulty of system design, has also improved the complexity of chip periphery circuit.The 3rd, traditional design is because the comparative voltage of its comparison circuit adopts fixed level; So for the system of different modulating degree, traditional design just can not be suitable for, existing technology generally is at first to confirm the modulation degree size; Again through changing the control signal of chip exterior; Change the comparative level of comparison circuit, but signal might be because uncertain factors such as noise influence its modulation degree in the practical application, this has just influenced the output bit error rate of traditional design.
If the amplitude keying signal of a kind of amplitude keying demodulator circuit adaptive reception different modulating as required degree is arranged; To cooperate different system to require to realize the common application of multisystem; Not only make the flexibility of whole radio-frequency front-end improve greatly, and better adapt to the ever-increasing market demand of areas of information technology new technology.
Summary of the invention
The invention belongs to the technology for radio frequency field; Relate to a kind of amplitude detection circuit; Relate in particular to a kind of amplitude keying demodulator circuit of big input dynamic range; Be used for radio-frequency transmitter, realize the demodulation of different modulating degree with the amplitude keying signal of big input dynamic range realized the accuracy of output signal.
Summary of the invention
The objective of the invention is provides a kind of radio frequency amplitude keying demodulator circuit of big input dynamic range for solving the above problem of the traditional amplitude keying demodulator circuit of prior art, can satisfy the requirement of different system for different demodulation factors.It removes the function of the detection demodulation that possesses the traditional demodulation circuit; The function that also has the input signal of comparative level self adaptation and demodulation HDR; Can better reduce peripheral components and system cost expense, help to improve system signal noise ratio, optimization system design.
Above-mentioned purpose of the present invention is to realize through following technical scheme:
The radio frequency amplitude keying demodulator circuit of big input dynamic range; It is: it is the amplitude keying demodulator circuit of two-way differential configuration that the radio frequency amplitude keying demodulator circuit of big input dynamic range is called for short the amplitude keying demodulator circuit; Single channel amplitude keying demodulator circuit input connects road intermediate-freuqncy signal in the radio-frequency front-end two-way differential intermediate frequency; The amplitude keying demodulator circuit of two-way differential configuration is integrated in radio-frequency front-end, and its output connects the digital baseband processing module of radio-frequency front-end next stage;
The single channel structure of amplitude keying demodulator circuit is formed and is comprised: amplitude detection circuit, gaussian filtering circuit, peak detection circuit, and comparison circuit; Amplitude detection circuit and gaussian filtering circuit are connected in series; The output of gaussian filtering circuit connects the input of peak detection circuit and an input of comparison circuit respectively; The output of peak detection circuit connects another input of comparison circuit; The output of comparison circuit is connected to the digital baseband processing module, and the feedback control signal of digital baseband processing module connects amplitude detection circuit.
Radio frequency amplitude keying demodulator circuit utilizes amplitude detection circuit to detect the amplitude information of input signal, reduces the outer member circuit, and the reference voltage that utilizes peak detection circuit to accelerate comparison circuit simultaneously changes with input signal, has accelerated system start-up and response speed.
Described amplitude keying demodulator circuit, it is that said amplitude detection circuit comprises some grades of fixed gain amplification grade circuits and corresponding amplitude detection and the change-over circuit that is connected; Wherein
Some grades of fixed gain amplification grade circuits are connected in series; The input signal of a road in the two-way radio-frequency differential input signal connects the input of first order fixed gain amplification grade circuit; The output of every grade of fixed gain amplification grade circuit connects the input of amplitude detection and change-over circuit, and amplitude detection is connected the input of gaussian filtering circuit with the output of change-over circuit.
The gaussian filtering circuit outputs to the input of peak detection circuit and an input of comparison circuit respectively with filtered range signal; Peak detection circuit transfers input signal to another input that the average signal of high amplitude outputs to comparison circuit; The size of comparison circuit comparison two-way input signal provides final output signal, offers the next stage baseband chip and carries out base band signal process.
Described amplitude keying demodulator circuit; It is that the progression of said some grades of fixed gain amplification grade circuits is S; The corresponding amplitude detection unit number that connects amplitude detection and change-over circuit also is S, the corresponding output that connects Vi amplitude detection unit of the output of Vi level fixed gain amplifier circuit; The value expression formula of above-mentioned S is S=
V/Va, in the formula:
VBe maximum detection signal voltage amplitude,
VaAccuracy of detection value for amplitude detection circuit.
The output of every grade of fixed gain amplifier circuit all connects an amplitude detection unit; Input signal is amplified to saturation distortion step by step through each fixed gain amplifier; Detect the i level fixed gain amplifier that causes exporting distorted signals by amplitude detection unit, provide corresponding amplitude detection signal value according to its position at whole amplifier chain
Vi, therefore for the signal of different input ranges, amplitude detection circuit can be exported the output signal that varies in size accordingly with input range.
Described amplitude keying demodulator circuit, it is that said amplitude detection and change-over circuit comprise S amplitude detection unit, and current adding circuit that is connected in series and current-to-voltage converting circuit; Current adding circuit has S input, the corresponding in regular turn output that connects S amplitude detection unit of amplitude detection and change-over circuit, and the output of current adding circuit connects current-to-voltage converting circuit, current-to-voltage converting circuit output voltage values
ViAmplitude detection circuit is used to detect input signal through being connected in series
iThe level fixed gain amplifier gains to add up step by step in regular turn and is amplified to the magnitude of voltage of saturation distortion
Vi,
Vi=
IVa, by
ViValue obtain corresponding to
iThe corresponding input range value of level fixed gain amplifier;
iSpan is 1～S.
Detect the fixed gain amplifier that causes exporting distorted signals by amplitude detection unit; Provide corresponding amplitude detection signal according to its position at whole amplifier chain; Therefore for the signal of different input ranges, the output of amplitude detection circuit can be exported the output signal that vary in size according to the difference of amplitude.Amplitude detection unit and current adding circuit adopt segmentation to detect fixed gain amplifying circuit amplifying signal amplitude; And obtain the dB linear relationship that output current and input signal amplitude appear with the exponential approximation mode; The input signal that under identical modulation degree, guarantees different amplitudes can both obtain identical error code bit rate; Effectively improve signal to noise ratio, and the piecewise approximation demodulation mode is than the power consumption minimizing of direct demodulation mode.
Described amplitude keying demodulator circuit; It is that said gaussian filtering circuit is the low pass filter of the adjustable Butterworth structure of bandwidth; Its cut-off frequency is revised through resistance and capacitance in the receiving system control signal control gaussian filtering circuit; Realize the change of its cut-off frequency, the gaussian filtering circuit is used for the radio-frequency component of filtering amplitude detection circuit output signal.
Adopt the variable resistor and the variable capacitance of electronic switch control in the gaussian filtering circuit; The receiving system control signal is through the break-make of control electronic switch; Realization is revised the cut-off frequency of adjusting range keying demodulator circuit to resistance in the gaussian filtering circuit and capacitance.
Described amplitude keying demodulator circuit; It is that said peak detection circuit comprises discharge circuit and the detecting circuit that is connected in series; The output of the positive input termination gaussian filtering circuit of discharge circuit; The negative input end of discharge circuit connects the output of detecting circuit, and the input of the output termination detecting circuit of discharge circuit, detecting circuit output are the input that the output of peak detection circuit connects comparison circuit; Wherein
Discharge circuit is the negative feedback control amplifier;
Detecting circuit is made up of the transistor AND gate resistance that diode connects;
The reference voltage that peak detection circuit is delivered to comparison circuit changes generation fast with input signal, is used to accelerate the startup and the response speed of amplitude keying demodulation electricity.
Described amplitude keying demodulator circuit; It is that said comparison circuit is made up of a comparator and a Schmidt trigger circuit; The output of an input termination peak detection circuit of comparison circuit; The output of another input termination gaussian filtering circuit is used in real time the relatively size of two paths of signals, and the output signal of comparison circuit is according to relatively big or small output digital signal corresponding.
The output of comparison circuit is the output of amplitude keying demodulator circuit; The input signal of amplitude keying demodulator circuit is the radio-frequency front-end intermediate-freuqncy signal; The radio-frequency front-end intermediate-freuqncy signal is the amplitude keying signal; The output signal of comparison circuit is the envelope of amplitude keying signal, the digital baseband processing module that the output brace of comparison circuit is outer.Comparison circuit adds the error code that Schmidt trigger can suppress generation, effectively reduces the error code bit rate.
Described amplitude keying demodulator circuit, it is that said amplitude keying demodulator circuit is made up of two-way differential ference spiral circuit, and the formation of two-way differential ference spiral circuit is identical, and the input of one tunnel differential ference spiral circuit inserts VIN, and demodulated output signal is VOUTN; The input of another road differential ference spiral circuit inserts VIP, and demodulated output signal is VOUTP.
The amplitude size of amplitude detection circuit detected amplitude keying signal; The envelope of output amplitude keying signal; Be used for the carrier signal of amplitude keying signal is eliminated, keep its envelope signal, owing to also comprise other radio-frequency component in the envelope signal of output; Other radio-frequency component through in the ability filtering envelope signal behind the gaussian filtering circuit filtering effectively suppresses High-frequency Interference.Adopt the Butterworth prototype filter can effectively improve the response to signal of filter; Peak-detector circuit can detect the peak value size of input signal; Network and original signal addition through a resistance capacitance composition; Obtain the reference voltage of the average signal of input signal, owing to this reference voltage can change with the input voltage peak change, so than adopting fixing reference electrode pressure energy to make that the signal of output is more accurate as comparison circuit; The output of comparison circuit adopts Schmidt trigger to suppress because the output error that the digital circuit burr produces effectively improves output signal-to-noise ratio.
Described amplitude keying demodulator circuit, its amplitude detection signal modulation degree that is the demodulation of said amplitude keying demodulator circuit is 0.5 ~ 0.9, is applicable to the radio-frequency receiver front-end up to 60dB dynamic range input signal.
The fast demodulation pattern that the amplitude keying demodulator circuit is realized can be followed the tracks of the variation of input signal fast, reduces the error rate of the demodulating data of output, adopts the system of amplitude keying demodulator circuit of the present invention, helps improving system signal noise ratio, optimization system design.The amplitude keying demodulator circuit can be used with the short distance radio communication system of multiple different modulating degree, the needs of the high dynamic duty system that can adapt to that input signal alters a great deal.
A kind of radio frequency amplitude keying demodulator circuit of big input dynamic range; It is that it utilizes amplitude detection circuit to detect the amplitude information of input signal; Reduce the outer member circuit; The reference voltage that utilizes peak detection circuit to accelerate comparison circuit simultaneously changes with input signal, has accelerated system start-up and response speed.
Described radio frequency amplitude keying demodulator circuit, it is that it comprises amplitude detection circuit, gaussian filtering circuit, peak detection circuit, and comparison circuit;
Described amplitude detection circuit comprises several fixed gain amplification grade circuits and amplitude detection unit circuit; Wherein several fixed gain amplification grade circuits are connected in series; Two-way radio-frequency differential input signal connects two inputs of first order fixed gain amplification grade circuit, and two outputs of every grade of fixed gain amplification grade circuit connect the input of amplitude detection unit circuit; The input of the output connection mode gaussian filtering circuit of amplitude detection unit circuit; The gaussian filtering circuit outputs to the input of peak detection circuit and an input of comparison circuit respectively with filtered range signal; Peak detection circuit transfers input signal to another input that the average signal of high amplitude outputs to comparison circuit; The size of comparison circuit comparison two-way input signal provides final output signal, offers the next stage baseband chip and carries out base band signal process;
Described amplitude detection unit; It comprises several amplitude detection unit; Current adding circuit and a current/voltage conversion circuit, the output of every grade of fixed gain amplifier circuit all connects an amplitude detection unit, and input signal is amplified to saturation distortion step by step through each fixed gain amplifier; Detect the i level fixed gain amplifier that causes exporting distorted signals by amplitude detection unit, provide corresponding amplitude detection signal value according to its position at whole amplifier chain
Vi, therefore for the signal of different input ranges, amplitude detection circuit can be exported the output signal that varies in size accordingly with input range.
The corresponding amplitude of output voltage signal output current signal that detects a fixed gain amplifier of described amplitude detection unit;
Described current adding circuit is with the detected output current addition of each amplitude detection unit;
Described current/voltage conversion circuit transfers the electric current of current adding circuit addition to voltage signal, offers the gaussian filtering processing of circuit;
Said gaussian filtering circuit is a typical low pass filter; Adopt second order Butterworth filter structure; The gaussian filtering circuit can change its cut-off frequency through resistance and the electric capacity of revising in the circuit; Through of the filtering of gaussian filtering circuit, suppress the radio-frequency component in the input to amplitude detection circuit output signal.
Said peak detection circuit; Comprise discharge circuit and detecting circuit; The output of the positive input termination gaussian filtering circuit of discharge circuit, the negative input end of discharge circuit connects the output of detecting circuit, the input of the output termination detecting circuit of discharge circuit; An input of the output termination comparison circuit of detecting circuit, detecting circuit is made up of the transistor AND gate resistance that diode connects;
The input of said comparison circuit connects the output of peak detection circuit and the output of gaussian filtering circuit respectively; Comparison circuit compares the size of two paths of signals in real time; According to relatively big or small output digital signal; Comparison circuit is made up of a comparator and a Schmidt trigger circuit, comparison circuit export to baseband chip;
Fixed gain amplifier cascade circuit in the described amplitude detection circuit can provide the gain up to 60dB; Simultaneously can also amplify signal above the 30MHz bandwidth; The gain ranging that the fixed gain amplifier cascade circuit can provide has determined the dynamic range of the input signal that whole amplitude keying demodulator circuit can receive, and compares traditional demodulator circuit about 20dB that can only provide up to the dynamic range of 60dB and improves greatly;
Described amplitude detection unit and current adding circuit; It is that also its segmentation detects fixed gain amplifying circuit amplifying signal amplitude; Adopt the output current that the mode of exponential approximation obtains and the amplitude of input signal to present the linear relation of dB at last; The dB linear relationship has guaranteed that the input signal of different amplitudes under identical modulation degree can both obtain identical bit error rate, and the mode that adopts this piecewise approximation has simultaneously reduced power consumption than the mode of direct demodulation.
Described radio frequency amplitude keying demodulator circuit; It is that also input signal is the amplitude keying signal, the amplitude size of amplitude detection circuit detected amplitude keying signal, the envelope of output amplitude keying signal; Be used for the carrier signal of amplitude keying signal is eliminated; Only comprise its envelope signal, because the envelope signal of output also comprises other radio-frequency components, so can suppress its radio-frequency component greatly through the signal behind the gaussian filtering circuit; Adopt the Butterworth prototype filter can effectively improve the response to signal of filter; Peak-detector circuit can detect the peak value size of input signal, through obtaining the reference voltage of the average signal of input signal as comparison circuit with the original signal interaction energy, because this reference voltage can change with the input voltage peak change; So than adopting fixing reference electrode pressure energy to make that the signal of output is more accurate, the output of comparison circuit adopts Schmidt trigger to suppress because the output error that the digital circuit burr produces.
Described peak detection circuit and comparison circuit; It is to utilize peak detection circuit to carry out the peak value detection can be followed the tracks of input signal more fast through the first-order filtering circuit envelope variation for the envelope signal of input signal; Also play simultaneously the average purpose of envelope signal of input signal; The comparative voltage that adopts this mode to produce both can guarantee can not receive the influence of input signal modulation degree; Satisfying the input signal of modulation degree in 0.5 ~ 0.9 scope can both right demodulation, can guarantee that comparative voltage has the short response time to catch up with fast simultaneously again.
Because digital signal is in course of adjustment can be jagged; Cause output to produce mistake for fear of burr; Simultaneously also the burst pulse that causes input signal to produce of the shake on the power supply exerts an influence to output, improves the stability of a system, has added Schmidt trigger; Good restraining issuable error code, and the reduction of possible bit error rate.
The receiving system of different modulating degree can adopt such scheme to realize; The present invention proposes an integrated circuit can satisfy a plurality of requirements simultaneously; Especially in the chip miniaturization; Integrated level requires under the increasingly high market demand background, adopts the receiving system that is integrated into the amplitude detection circuit can better save hardware spending and external component quantity, and the stability of system is improved greatly.
Substantial effect of the present invention:
1, the radio frequency amplitude keying demodulator circuit of big input dynamic range of the present invention can be used with the short distance radio communication system of multiple different modulating degree, can adapt to the needs that input signal changes high dynamic duty system greatly.
2, radio frequency amplitude keying demodulator circuit of the present invention is inner integrated peak-detector circuit; The reference voltage that peak detection circuit is delivered to comparison circuit changes generation fast with input signal; Accelerate the startup and the response speed of amplitude keying demodulation electricity; Make chip respond the variation of input signal faster, be applicable to the more radio-frequency front-end and the receiving system of wide region.Help improving system signal noise ratio simultaneously, optimization system design.
3, the comparison circuit of radio frequency amplitude keying demodulator circuit of the present invention adds Schmidt trigger and suppresses issuable error code, effectively reduces the error code bit rate.
But 4, the present invention flexible Application is in the amplitude keying demodulator circuit of the amplitude detection signal of modulation degree from 0.5 ~ 0.9, thereby can be applicable to the radio-frequency receiver front-end up to 60dB dynamic range input signal.
Description of drawings
Fig. 1 is traditional amplitude keying demodulator circuit theory diagram.
Among Fig. 1: 11 is amplifying circuit, and 12 is diode circuit, and 13 is a comparison circuit, and capacitor C 1 is to receive electric capacity and the inductance outside the chip with inductance L 1, and Vref is the reference voltage of input.
Fig. 2 is a kind of improved amplitude keying demodulator circuit theory diagram of the present invention;
Among Fig. 2: 21 is amplifying circuit, and 22 is diode circuit, and 23 is a comparison circuit, and capacitor C 1 is to receive electric capacity and the inductance outside the chip with inductance L 1, and capacitor C 2 resistance R 2 constitute the single order low-pass filter circuits, and Vref is the reference voltage of input.
Fig. 3 a is that the two-way difference of the amplitude keying demodulator circuit of first embodiment of the invention constitutes block diagram;
Fig. 3 b is that the two-way difference of embodiment of the invention amplitude keying demodulator circuit constitutes schematic block diagram;
Among Fig. 3 a and Fig. 3 b: 31,31-1,31-2 are amplitude detection circuit, 32,32-1,32-2 be the gaussian filtering circuit, 33,33-1,33-2 be peak detector; 34,34-1,34-2 are comparison circuit, and 301 is S level cascade fixed gain amplifying circuit, and 302 is amplitude detection and change-over circuit; 303 is amplifying circuit; 304 for chip integration becomes diode circuit, and VINP and VINN are differential input signal, and VOUTN is a differential output signal.
Fig. 4 is that the amplitude detection circuit of the embodiment of the invention constitutes block diagram;
Among Fig. 4: 4 is amplitude detection circuit, and 41 is S level cascade fixed gain amplifying circuit, and 42 for being amplitude detection and change-over circuit; 421～425 is amplitude detection unit 1～S, and 326 is the current summation device, and 427 current/voltages are change-over circuit; VIN is one road differential input signal
ViBe amplitude detection circuit output signal.
Fig. 5 is 5 amplitude detection circuit formation block diagram for embodiment of the invention S value;
Among Fig. 5: 51 is 5 grades of cascade fixed gain amplifiers, and 52 is amplitude detection circuit and conversion, and 511～515 is Pyatyi fixed gain amplifying stage; 521～525 is five amplitude detection unit, and 526 is current adding circuit, and 527 is the I-V conversion control circuit; VIN is an input signal
ViBe the output signal.
Fig. 6 is the formation schematic block diagram of the gaussian filtering circuit of the embodiment of the invention to final output.
Among Fig. 6: VINP is the signal input, and 61 is the gaussian filtering circuit, the 601st, and high-gain discharge circuit, C1; C2 is a tunable capacitor, and R1, R2 are adjustable resistances, the 62nd, and peak detection circuit; The 602nd, the high-gain amplifying circuit, the 603rd, peak detector, R4 are the resistance of first-order filtering circuit, C3 is the electric capacity of first-order filtering circuit; 63 is comparison circuit, the 604th, and Schmidt trigger circuit, the 605th, comparator.
Fig. 7 a is the output of RSSI in the embodiment of the invention emulation experiment, demodulation output and peak-detector circuit.
Among Fig. 7 a: original is the RSSI curve of output, and Final is the demodulation curve of output, and peak hold is the curve of output of peak-detector circuit.
Fig. 7 b is that modulation depth is 0.9 input signal and exports restituted signal in the embodiment of the invention emulation experiment.
Among Fig. 7 b: it is 0.9 input signal that following surface curve is represented modulation degree, last surface curve representative output restituted signal, and the as can be seen from the figure corresponding input signal of intermodulation signal can the right demodulation input signal.
Fig. 7 c is that modulation degree is 0.5 input signal and exports restituted signal in the embodiment of the invention emulation experiment.
Among Fig. 7 c: it is 0.5 input signal that following surface curve is represented modulation degree, last surface curve representative output restituted signal, and the as can be seen from the figure corresponding input signal of intermodulation signal can the right demodulation input signal.
Embodiment
Shown in Figure 1 is traditional amplitude keying demodulator circuit schematic block diagram, and differential input signal VIN and VIP carry out demodulation through two-way differential amplitude keying demodulator circuit.Fig. 1 only illustrates single channel amplitude keying demodulator circuit; After one road differential input signal amplifies through amplifying circuit 11; Through diode 12 detections; The filter network filtering high-frequency signal of forming through inductance L 1 and capacitor C 1 again, filter network output signal and fixed level VREF send comparison circuit 13 to compare simultaneously, comparison circuit 13 output amplitude keying restituted signals.Fixed level VREF is produced by the power supply dividing potential drop, and the precision of the output signal after the demodulation of the output of comparison circuit is low, can not follow the amplitude size of reflection differential input signal.
A kind of improved traditional amplitude keying demodulator circuit theory diagram of the present invention is as shown in Figure 2.Differential input signal VIN and VIP carry out demodulation through two-way differential amplitude keying demodulator circuit.After differential input signal VIN amplifies through amplifier 21-1; Through diode 22-1 detection; The filter network filtering high-frequency signal of forming through inductance L 1 and capacitor C 1 again; The single order low-pass filter network that filtered signal is formed through resistance R 2 and capacitor C 1 again produces the comparative level of comparison circuit; Than the fixed level VREF mode relatively of Traditional use, the method can reduce to a certain extent because the input signal modulation degree changes the bit error rate that produces, and long comparison has simultaneously seriously restricted the real-time respective capabilities of short distance radio communication system start-up time.
The present invention introduce to replace script to need the detecting circuit of outer member amplitude detection circuit, adds peak detection circuit simultaneously and has shortened start-up time greatly, thereby make that this demodulation mode can quick corresponding input signal; Saved outer member simultaneously; Reduce circuit overhead and power consumption, improved the performance of system, and the sensitivity of system etc.; Can also reduce equipment power dissipation and volume thus, practice thrift cost.The radio frequency amplitude keying demodulator circuit of a kind of big input dynamic range of the present invention; Applicable to short distance radio communication system; Needing to be particularly suitable for the short distance radio communication system of response fast, such as the workplace of no-stop charging system and gate, garage management system.
Through embodiment and combine accompanying drawing, technical scheme of the present invention is further specified below.
First embodiment
The two-way difference that Fig. 3 a provides the amplitude keying demodulator circuit of first embodiment of the invention constitutes block diagram.The two-way amplitude keying demodulator circuit that the two-way difference constitutes is identical.Input signal VINP and VINN detect the signal amplitude value by amplitude detection circuit 31-1 and 31-2 respectively; Detected range value is more respectively through with the Butterworth filter being the Gaussian filter 32-1 and the 32-2 of prototype; The interference of filtering high-frequency signal; Gaussian filter 32-1 and 32-2 are by controlling its bandwidth from the Base-Band Processing control signal, through disposing required bandwidth to satisfy the requirement of different rates and different communication systems.The output of Gaussian filter 32-1 and 32-2 offers peak detection circuit 33-1 and 33-2; Respectively obtain a peak value inhibit signal; The output signal of this signal and Gaussian filter 32-1 and 32-2 obtains the result of comparison through comparison circuit 34-1 and 34-2; Be the output VOUTN and the VOUTP of the restituted signal of two-way difference, the baseband processing module that at last output of restituted signal is offered next stage is handled.
The single channel difference channel that Fig. 3 b provides the amplitude keying demodulator circuit of first embodiment of the invention constitutes schematic block diagram.Amplitude detection circuit 31, gaussian filtering circuit 32, peak detection circuit 33, comparison circuit 34, S level cascade fixed gain amplifying circuit 301, amplitude detection and change-over circuit 302, amplifying circuit 303, chip integration become diode circuit 304.The fixed gain amplifying circuit 301 that input signal VINN forms through the S level fixed gain amplifying stage cascade in the amplitude detection RSSI circuit 31; Fixed gain amplifying circuit 301 is amplified to input signal saturated step by step, and the output of each grade fixed gain amplifying stage connects an amplitude detection unit of amplitude detection and change-over circuit 302, with the output amplitudes detection current summations at different levels and the I-V conversion of fixed gain amplifying circuit 31; Obtain a voltage signal relevant with input signal amplitude; This voltage signal obtains a voltage VP through gaussian filtering circuit 32 filtering radio-frequency components, and the output of gaussian filtering circuit is simultaneously made peak value through amplifying circuit in the peak detection circuit 33 303 and diode circuit 304 and detected, and obtains a forward voltage signal VN; Feed back to the backward end of amplifying circuit 303; Amplify through diode circuit 304 again after the output voltage signal VP of forward voltage signal VN and gaussian filtering circuit 32 subtracts each other, if the input of 304 diode circuits greater than before the output of diode circuit, then the input of this moment is through the output of 304 diode circuits; If less than output before; Output before then keeping, thus the peak information of input signal just obtained, and the output VP of the output VN of 33 peak detection circuits and gaussian filtering circuit before is through comparison circuit 34 relatively; Comparison circuit and traditional comparative result that does not have peak detection circuit; If this moment the input signal flip-flop, peak detection circuit is the output of capturing input signal fast, thereby provide a compensating signal to original comparative level VN; The variation of response input signal fast; This mode is for the fast-changing signal of radio communication especially short-distance wireless communication, and the characteristics of its rapid sensitive well satisfy its demand, and last comparison circuit offers baseband processing module with output and handles.
The amplitude detection circuit that Fig. 4 has provided embodiment of the invention S level cascade fixed gain amplifying stage constitutes block diagram.S level fixed gain amplifying stage 411～415 cascade of connecting successively; Every grade of fixed gain amplifying stage output and 421～425 corresponding connections of S amplitude detection unit; The output correspondence of S amplitude detection unit 421～425 is connected to S current summation input of current adding circuit 426; The output of current adding circuit 423 is delivered to current-to-voltage converting circuit 427, and the output of current-to-voltage converting circuit 427 is seen the amplitude detection circuit output signal voltage off
ViRadio frequency one road differential input signal VIN delivers to by S level cascade fixed gain amplifying stage 41 first order 411; Fixed gain amplifying stage 411 output signal correspondences are added to first amplitude detection unit 421; Amplitude detection unit 421 output currents are delivered to the input of current adding circuit 426, and current adding circuit 426 outputs convert voltage to through current-to-voltage converting circuit 427
V1First order fixed gain amplifying stage 411 output signals send next stage fixed gain amplifying stage 412 to amplify simultaneously; Fixed gain amplifying stage 412 output signal correspondences are added to second amplitude detection unit 422; Amplitude detection unit 422 output currents are delivered to the input of current adding circuit 426, and current adding circuit 426 outputs convert voltage to through current-to-voltage converting circuit 427
V2By that analogy; I level fixed gain amplifying stage 414 output signals send next stage fixed gain amplifying stage to amplify simultaneously; Fixed gain amplifying stage 414 output signal correspondences are added to i amplitude detection unit 424; Amplitude detection unit 424 output currents are delivered to the input of current adding circuit 426, and current adding circuit 426 outputs convert voltage to through current-to-voltage converting circuit 427
ViAmplitude detection unit and current adding circuit adopt segmentation to detect fixed gain amplifying circuit amplifying signal amplitude; And obtain the dB linear relationship that output current and input signal amplitude appear with the exponential approximation mode; The input signal that under identical modulation degree, guarantees different amplitudes can both obtain identical error code bit rate, and the piecewise approximation demodulation mode is than the power consumption minimizing of direct demodulation mode.
Fig. 5 is that the amplitude detection circuit (RSSI) of the embodiment of the invention constitutes schematic block diagram.51 is 5 grades of cascade fixed gain amplifiers, and 52 is amplitude detection circuit and conversion, and 511～515 is Pyatyi fixed gain amplifying stage, and 521～525 is five amplitude detection unit, and 526 is current adding circuit, and 527 is the I-V conversion control circuit, and VIN is an input signal,
ViBe output signal voltage.The cascade of connecting successively of 5 grades of fixed gain amplifying stages 511～515; Every grade of fixed gain amplifying stage output and 521～525 corresponding connections of 5 amplitude detection unit; The output correspondence of 5 amplitude detection unit 521～525 is connected to 5 current summation inputs of current adding circuit 526; The output of current adding circuit 523 is delivered to current-to-voltage converting circuit 527, and the output of current-to-voltage converting circuit 527 is seen the amplitude detection circuit output signal voltage off
ViRadio frequency one road differential input signal VIN delivers to by 5 grades of cascade fixed gain amplifying stage 51 first order 511; Fixed gain amplifying stage 511 output signal correspondences are added to first amplitude detection unit 521; Amplitude detection unit 521 output currents are delivered to the input of current adding circuit 526, and current adding circuit 526 outputs convert voltage to through current-to-voltage converting circuit 527
V1First order fixed gain amplifying stage 511 output signals send next stage fixed gain amplifying stage 512 to amplify simultaneously; Fixed gain amplifying stage 512 output signal correspondences are added to second amplitude detection unit 522; Amplitude detection unit 522 output currents are delivered to the input of current adding circuit 526, and current adding circuit 526 outputs convert voltage to through current-to-voltage converting circuit 527
V2By that analogy; The 4th grade of fixed gain amplifying stage 514 output signal correspondences are added to the 4th amplitude detection unit 524; Amplitude detection unit 524 output currents are delivered to the input of current adding circuit 526, and current adding circuit 526 outputs convert voltage to through current-to-voltage converting circuit 527
V4If receiving front-end detects output signal saturation distortion, the 4th grade of fixed gain amplifying stage 514 output signals no longer send the 5th grade of fixed gain amplifying stage 515 to amplify.
Second embodiment
The physical circuit that Fig. 6 has provided the output from the gaussian filtering circuit to comparison circuit of embodiment of the invention amplitude keying demodulator circuit constitutes block diagram, comprises gaussian filtering circuit 61, peak detection circuit 62 and comparison circuit 63.Gaussian filtering circuit 61 is by variable resistor R1, R2 and variable capacitance C1, and C2 and discharge circuit 601 are formed, and this is a typical low pass filter, adopts second order Butterworth filter structure ...The gaussian filtering circuit changes its cut-off frequency through resistance R 1 in the adjustment circuit and R2 value and capacitor C 1 and C2 value, through the filtering of gaussian filtering circuit to amplitude detection circuit output signal, suppresses the radio-frequency component in the input.VIN is the output signal of amplitude detection circuit, through 61 outputs of gaussian filtering circuit, the variable resistor R1 of gaussian filtering circuit 61; R2 and variable capacitance C1, C2 is controlled by 3 holding wires of receiving system; Change their resistance value or capacitance, can obtain different cutoff frequencies, thereby change the bandwidth of gaussian filtering circuit 61; The better signal rate requirement that cooperates the different received system is provided with required bandwidth.The output signal of gaussian filtering circuit 61 is respectively directly with through being input to two inputs of comparison circuit 63 again behind the peak detection circuit 62; Peak detection circuit 62 is at first through amplifying circuit 602 and diode circuit 603; Peak signal input with signal; Because peak signal remains close with the amplitude of input signal; So follow the variation tendency of input signal fast, the output of diode circuit 603 connects the first-order filtering circuit that is made up of resistance R 4 and capacitor C 3, the envelope variation that can follow the tracks of input signal through the first-order filtering circuit fast; Play the purpose of equalizing input signal envelope simultaneously through envelope detection; The comparative voltage that adopts this mode to produce both can guarantee can not receive the influence of input signal modulation degree, and satisfying the input signal of modulation degree in 0.5 ~ 0.9 scope can both right demodulation, can guarantee that comparative voltage has the short response time to catch up with fast simultaneously again.Through a filter circuit that the integration of peak value and signal is balanced, make the variation of superposed signal height on the peak value itself, the signal of the last output of peak detection circuit can characterize the variation of the size of input signal, can follow the tracks of the variation of input signal amplitude peak simultaneously.The output signal of peak detection circuit 62 is added to comparison circuit 63 inputs, compares the restituted signal of comparison circuit 63 final outputs at the output signal of comparison circuit 63 with gaussian filtering circuit 61.Comparison circuit 63 is made up of a Schmidt trigger 604 and a comparator 605; The output of gaussian filtering circuit 61 connects the input of Schmidt trigger 604; The output of Schmidt trigger 604 connects the comparison signal input of comparator 605, and the reference signal input of comparator 605 connects the output of peak detection circuit 62.Because digital signal has the interference burr in processing procedure, produce error code and cause exporting signal, the burst pulse that causes input signal to produce for the shake of avoiding on the power supply simultaneously exerts an influence to output, improves the stability of a system.Added Schmidt trigger, good restraining issuable error code, and the reduction of possible error code bit rate.Comparison circuit 63 adopts the hysteresis structural circuits, adds the Schmidt trigger of hysteretic characteristic, can digital signal be eliminated because of the erroneous judgement that the High-frequency Interference of power supply or ground wire causes fully, thereby reduce the error rate.
Explain that in conjunction with Fig. 5～Fig. 6 amplitude keying demodulator circuit implementation procedure among the present invention: input signal VINP (VINN) gets into the fixed gain amplifier 511 of amplitude detection circuit; Pyatyi cascade fixed gain amplifier 51 amplification input signal step by step arrives saturated; The respective amplitude detection is sent in every cascade fixed gain amplifier output; Each amplitude detection unit detects the fixedly amplitude output signal of amplifier of respective stages; Each amplitude detection unit is sent current adding circuit 526 with output current signal, does the I-V conversion through current-to-voltage converting circuit 527, output and the close voltage signal of input signal size
ViJudge to obtain the amplifier progression that causes signal saturated, the result that amplitude detection and change-over circuit 52 will detect transfers voltage signal to, exports to gaussian filtering circuit 61, and gaussian filtering circuit 61 is with filtering amplitude detection circuit 5 output voltage signals
ViIn radio-frequency component; The cut-off frequency of gaussian filtering circuit 61 can be adjusted according to practical application by system; A road of gaussian filtering circuit 61 is exported to the input of the Schmidt trigger 604 of comparison circuit 63; After Schmidt trigger 604 suppresses issuable error code, voltage signal is delivered to the comparison signal input of comparator 605.Gaussian filtering circuit 61 will be exported signal simultaneously and give peak detection circuit 62; Peak detection circuit via amplifying circuit 602 and diode circuit 603 are formed is done the peak value detection; Resistance R 4 is exported the reference voltage input terminal that peak detection signal is delivered to comparator 605 with the first-order filtering circuit that capacitor C 3 constitutes; Diode circuit 603 adopts the transistor in the sheet to replace the outer diode of sheet; The input of diode circuit 603 is from the output of amplifying circuit 602; The output of diode circuit 603 directly takes back the negative input end of amplifying circuit 602, and peak detection circuit 62 can go out the peak value of input signal according to the change-detection of input, and the relevant while with the input signal peak value of variation output according to the input signal peak value is again the average signal of input signal simultaneously; Adopt the reference comparative level of such signal as comparison circuit 62; The signal that can avoid producing after the direct first-order filtering of Traditional use fixed level or input signal is during as comparative level, and defeated bit error rate is too high, and output is the problem of the corresponding overlong time that changes of input relatively; The output of comparison circuit 63 is exactly the numeral output of amplitude keying demodulator circuit, this output signal again through baseband processing module further decoding obtain the information that needs.RSSI curve of output, Final are the demodulation curve of output, and peak hold is the curve of output of peak-detector circuit
Fig. 7 a provides the emulation experiment demodulation curve of amplitude keying demodulator circuit of the present invention; Last surface curve (Peak hold) is the curve of output of peak-detector circuit; Following surface curve (Original) is the RSSI curve of output, and intermediate curve (Final signal) is the final demodulation curve of output of the present invention's technology.From Fig. 7 a, can find out, adopt the signal response (Final signal) of the present invention's technology, response speed obviously is superior to not adopting the response speed of the technological RSSI output signal of the present invention.
No matter from Fig. 7 b and Fig. 7 c, can find out, be that the input modulation degree is 0.9 or to import modulation degree be 0.5 input signal, adopts amplitude keying demodulator circuit of the present invention can both correctly export restituted signal, and the signal after the demodulation is accurate corresponding to input signal.The present invention is applicable to radio-frequency receiving system, needing to be particularly suitable for the short distance radio communication system of response fast, such as the workplace of no-stop charging system and gate, garage management system.
It will be understood by those skilled in the art that and under the prerequisite that does not deviate from broad scope of the present invention, the foregoing description is made some changes.Thereby the present invention is not limited in disclosed specific embodiment.Its scope should contain core of the present invention and the interior all changes of protection range that appended claims limits.
Claims (9)
1. the radio frequency amplitude keying demodulator circuit of big input dynamic range; It is characterized in that: the radio frequency amplitude keying demodulator circuit of big input dynamic range is the amplitude keying demodulator circuit of two-way differential configuration; Single channel amplitude keying demodulator circuit input connects road intermediate-freuqncy signal in the radio-frequency front-end two-way differential intermediate frequency; The amplitude keying demodulator circuit of two-way differential configuration is integrated in radio-frequency front-end, and its output connects the digital baseband processing module of radio-frequency front-end next stage;
The single channel structure of amplitude keying demodulator circuit is formed and is comprised: amplitude detection circuit, gaussian filtering circuit, peak detection circuit, and comparison circuit; Amplitude detection circuit and gaussian filtering circuit are connected in series; The output of gaussian filtering circuit connects the input of peak detection circuit and an input of comparison circuit respectively; The output of peak detection circuit connects another input of comparison circuit; The output of comparison circuit is connected to the digital baseband processing module, and the feedback control signal of digital baseband processing module connects amplitude detection circuit.
2. amplitude keying demodulator circuit according to claim 1 is characterized in that: said amplitude detection circuit comprises some grades of fixed gain amplification grade circuits and corresponding amplitude detection and the change-over circuit that is connected; Wherein
Some grades of fixed gain amplification grade circuits are connected in series; The input signal of a road in the two-way radio-frequency differential input signal connects the input of first order fixed gain amplification grade circuit; The output of every grade of fixed gain amplification grade circuit connects the input of amplitude detection and change-over circuit, and amplitude detection is connected the input of gaussian filtering circuit with the output of change-over circuit.
3. amplitude keying demodulator circuit according to claim 2; It is characterized in that: the progression of said some grades of fixed gain amplification grade circuits is S; The corresponding amplitude detection unit number that connects amplitude detection and change-over circuit also is S, the corresponding output that connects Vi amplitude detection unit of the output of Vi level fixed gain amplifier circuit; The value expression formula of above-mentioned S is S=
V/Va, in the formula:
VBe maximum detection signal voltage amplitude,
VaAccuracy of detection value for amplitude detection circuit.
4. according to claim 2 or 3 described amplitude keying demodulator circuits, it is characterized in that: said amplitude detection and change-over circuit comprise S amplitude detection unit, and current adding circuit that is connected in series and current-to-voltage converting circuit; Current adding circuit has S input, the corresponding in regular turn output that connects S amplitude detection unit of amplitude detection and change-over circuit, and the output of current adding circuit connects current-to-voltage converting circuit, current-to-voltage converting circuit output voltage values
ViAmplitude detection circuit is used to detect input signal through being connected in series
iThe level fixed gain amplifier gains to add up step by step in regular turn and is amplified to the magnitude of voltage of saturation distortion
Vi,
Vi=
IVa, by
ViValue obtain corresponding to
iThe corresponding input range value of level fixed gain amplifier;
iSpan is 1～S.
5. amplitude keying demodulator circuit according to claim 1 and 2; It is characterized in that: said gaussian filtering circuit is the low pass filter of the adjustable Butterworth structure of bandwidth; Its cut-off frequency is revised through resistance and capacitance in the receiving system control signal control gaussian filtering circuit; Realize the change of its cut-off frequency, the gaussian filtering circuit is used for the radio-frequency component of filtering amplitude detection circuit output signal.
6. amplitude keying demodulator circuit according to claim 1; It is characterized in that: said peak detection circuit comprises discharge circuit and the detecting circuit that is connected in series; The output of the positive input termination gaussian filtering circuit of discharge circuit; The negative input end of discharge circuit connects the output of detecting circuit, and the input of the output termination detecting circuit of discharge circuit, detecting circuit output are the input that the output of peak detection circuit connects comparison circuit; Wherein
Discharge circuit is the negative feedback control amplifier;
Detecting circuit is made up of the transistor AND gate resistance that diode connects;
The reference voltage that peak detection circuit is delivered to comparison circuit changes generation fast with input signal, is used to accelerate the startup and the response speed of amplitude keying demodulation electricity.
7. amplitude keying demodulator circuit according to claim 1 and 2; It is characterized in that: said comparison circuit is made up of a comparator and a Schmidt trigger circuit; The output of an input termination peak detection circuit of comparison circuit; The output of another input termination gaussian filtering circuit is used in real time the relatively size of two paths of signals, and the output signal of comparison circuit is according to relatively big or small output digital signal corresponding.
8. according to claim 1 or 6 described amplitude keying demodulator circuits; It is characterized in that: said amplitude keying demodulator circuit is made up of two-way differential ference spiral circuit; The formation of two-way differential ference spiral circuit is identical; The input of one tunnel differential ference spiral circuit inserts VIN, and demodulated output signal is VOUTN; The input of another road differential ference spiral circuit inserts VIP, and demodulated output signal is VOUTP.
9. according to claim 1 or 6 described amplitude keying demodulator circuits, it is characterized in that: the amplitude detection signal modulation degree of said amplitude keying demodulator circuit demodulation is 0.5 ~ 0.9, is applicable to the radio-frequency receiver front-end up to 60dB dynamic range input signal.
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