CN103856430B - A kind of OOK receiver data extractors based on displacement peak-value detection method - Google Patents
A kind of OOK receiver data extractors based on displacement peak-value detection method Download PDFInfo
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- CN103856430B CN103856430B CN201410117068.8A CN201410117068A CN103856430B CN 103856430 B CN103856430 B CN 103856430B CN 201410117068 A CN201410117068 A CN 201410117068A CN 103856430 B CN103856430 B CN 103856430B
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Abstract
The invention discloses a kind of OOK receiver data extractors based on displacement peak-value detection method, make the analog baseband signal after filtering by shift unit to realize the negatively shifted of voltage first, then the positive peak value of the signal after displacement is detected, as decision level, finally the decision level signal is compared with analog baseband signal by comparator, obtain digital baseband signal, complete the extraction of digital baseband signal, concrete structure includes shifter, first rail-to-rail operation transconductance amplifier A1, first p-type MOS transistor M1, first electric capacity C1, first resistor R1, second rail-to-rail operation transconductance amplifier A2 and second resistance R2.The present invention realizes the characteristics of directly isolating data signal from analog signal, and fast response time can adjust decision level such that it is able to obtain accurate demodulated signal according to the magnitude of voltage that displacement is adjusted the need for design, and sensitivity is high.
Description
Technical field
The present invention relates to a kind of OOK receiver data extractors based on displacement peak-value detection method, belong to signal modulation
Technology.
Background technology
On-off keying amplitude modulation system（OOK）Signal is the amplitude-modulated signal of on-off keying, using the break-make on diverse location
The different information of transmission, the accuracy to pulse position will determine final demodulation bit error rate.The information demodulation of radio communication can
To use analog circuit or digital circuit.For complicated modulates information mode, solution is realized typically in digital circuit
Adjust；And for the simple modulation mode such as OOK, analog demodulator has a succinct, reliable advantage, but what preliminary demodulation was obtained
Information is still analog signal, it is necessary to recover data signal therefrom so that rear class digital module is processed.Due to signal
Information be embodied in the different position of envelope, when position changes, the information contained by it changes, it is necessary to find one kind
Effective method accurately extracts envelope position and exports ' 0 ', ' 1 ' signal.
Data extractor is a kind of signal processing module that detection signal is converted to data signal.Data extractor
Core is high-speed comparator, and the signal that will be detected is compared with decision level, so as to obtain data signal for numeral
Treatment.The key of comparator is how to obtain accurate effective decision level.The generation of decision level typically has two methods, i.e.,
The method of average voltage and the method for detection peak value.The mode of average voltage detection is obtained by a bulky capacitor upper integral
The average value of detection signal is used as decision level, dependable performance, strong antijamming capability, but response speed is slow, when signal is unexpected
When changing, the time that the average value for detecting responds and changes is more long；And detect the mode of peak value and examined by peak value
Survey with resistance-capacitance network to determine decision level, fast response time, but there is judgement faintly in poor reliability, comparator
Band.
The content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention to provide a kind of based on displacement peakvalue's checking
The OOK receiver data extractors of method, take a kind of peak detection technology based on level shift to provide decision level, lead to
Analog circuit is crossed to separate the digital baseband signal in receiver from analog baseband signal（Recover i.e. from detection signal
Go out data signal）, the characteristics of with simple for structure, fast response time, sensitivity high.
Technical scheme：To achieve the above object, the technical solution adopted by the present invention is：
A kind of OOK receiver data extractors based on displacement peak-value detection method, including shifter, the first rail-to-rail fortune
Calculate trsanscondutance amplifier A1, the first p-type MOS transistor M1, the first electric capacity C1, first resistor R1, the second rail-to-rail computing
Trsanscondutance amplifier A2 and second resistance R2；
Base-band input signal Vin is connected to the input of shifter, first passes through the analog baseband signal after filtering
Shift unit detects the positive peak value of the signal after displacement to realize the negatively shifted of voltage, then, as decision level, finally
The decision level signal is compared with analog baseband signal by comparator, digital baseband signal is obtained, digital base is completed
The extraction of band signal, concrete structure includes that the output end Vf of shifter is connected to the negative of the first rail-to-rail operation transconductance amplifier A1
Input, one end of the first electric capacity C1 and one end of first resistor R1 are grounded, the other end of the first electric capacity C1, first resistor R1
The drain electrode of the other end and the first p-type MOS transistor M1 connect the just defeated of the first rail-to-rail operation transconductance amplifier A1
Enter end, the output end of the first rail-to-rail operation transconductance amplifier A1 is connected to the grid of the first p-type MOS transistor M1,
The source electrode of the first p-type MOS transistor M1 connects supply voltage, such first p-type MOS transistor M1, first
Electric capacity C1 and first resistor R1 constitutes the charge circuit of feedback；The positive input terminal connection of the second rail-to-rail operation transconductance amplifier A2
To base-band input signal Vin, the negative input end of the second rail-to-rail operation transconductance amplifier A2 is connected to the first p-type metal oxide
The drain electrode of transistor M1, second resistance R2 is connected across between the positive-negative input end of the second rail-to-rail operation transconductance amplifier A2, the
The output end of two rail-to-rail operation transconductance amplifier A2 is the digital baseband signal Vout for separating, second resistance R2 bridgings
Between the positive-negative input end of the second rail-to-rail operation transconductance amplifier A2, comparison circuit is constituted.
Specifically, institute's shifter includes the 3rd rail-to-rail operation transconductance amplifier A3, the second p-type metal oxide crystal
Pipe M2,3rd resistor R3 and the first current source I1, base-band input signal Vin are connected to the 3rd rail-to-rail operation transconductance amplifier A3
Negative input end, the output end of the 3rd rail-to-rail operation transconductance amplifier A3 is connected to the second p-type MOS transistor M2
Grid, the source electrode of the second p-type MOS transistor M2 connects supply voltage, the second p-type MOS transistor M2's
Drain electrode connects one end of 3rd resistor R3 and feeds back to the positive input terminal of the 3rd rail-to-rail operation transconductance amplifier A3,3rd resistor
The other end of R3 is connected to the first current source I1, while as the output end Vf of shifter.
The current value of the first current source I1 is certain, needed for being obtained by the resistance for choosing suitable 3rd resistor R3
Shift voltage value.Output signal Vf differs a displacement voltage value with input signal Vin, it is achieved thereby that the work(of voltage shift
Can, the voltage shifted in circuit of the invention is 150mV.
Beneficial effect：The OOK receiver data extractors based on displacement peak-value detection method that the present invention is provided, improve
The method that the peakvalue's checking of traditional data separator produces decision level, carries out level shifting operations, so to detection signal first
Carry out peakvalue's checking again afterwards, the result of peakvalue's checking as comparator decision level；Shift unit is used so that circuit can be with
The magnitude of voltage of displacement is adjusted according to the actual needs, may finally isolate more accurate digital baseband signal；With traditional two
Pole pipe shift unit is small compared to the magnitude of voltage of displacement and can be sized, and improves sensitivity and the accuracy of detection；And by
More easy of integration in cmos circuitry in diode is not used, the requirement to supply voltage is low, can realize integrated level higher
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of shifted data separator of the invention；
When Fig. 2 is for reception -65dBm signals, main signal waveform in circuit of the present invention；Wherein 2 (a) is in invention circuit
Input signal and decision level, 2 (b) comparator output digital baseband signal Vout.
Specific embodiment
The present invention is further described below in conjunction with the accompanying drawings.
As shown in Figure 1 for it is a kind of based on displacement peak-value detection method OOK receiver data extractors, make first filtering it
Analog baseband signal afterwards detects the positive peak of the signal after displacement by shift unit to realize the negatively shifted of voltage, then
Value, as decision level, is finally compared the decision level signal with analog baseband signal by comparator, obtains digital base
Band signal, completes the extraction of digital baseband signal, and concrete structure includes shifter, the first rail-to-rail operation transconductance amplifier
A1, the first p-type MOS transistor M1, the first electric capacity C1, first resistor R1, the second rail-to-rail operation transconductance amplifier A2
With second resistance R2.
Institute's shifter includes the 3rd rail-to-rail operation transconductance amplifier A3, the second p-type MOS transistor M2, the
Three resistance R3 and the first current source I1, base-band input signal Vin are connected to the negative defeated of the 3rd rail-to-rail operation transconductance amplifier A3
Enter end, the output end of the 3rd rail-to-rail operation transconductance amplifier A3 is connected to the grid of the second p-type MOS transistor M2,
The source electrode of the second p-type MOS transistor M2 connects supply voltage, and the drain electrode of the second p-type MOS transistor M2 connects
One end of three resistance R3 simultaneously feeds back to the positive input terminal of the 3rd rail-to-rail operation transconductance amplifier A3, and 3rd resistor R3's is another
End be connected to the first current source I1, while as the output end Vf of shifter.
The output end Vf of shifter is connected to the negative input end of the first rail-to-rail operation transconductance amplifier A1, the first electric capacity C1
One end and one end of first resistor R1 be grounded, the other end of the first electric capacity C1, the other end of first resistor R1 and the first p-type
The drain electrode of MOS transistor M1 connects the positive input terminal of the first rail-to-rail operation transconductance amplifier A1, the first rail-to-rail fortune
The output end for calculating trsanscondutance amplifier A1 is connected to the grid of the first p-type MOS transistor M1, the first p-type metal oxide
The source electrode of transistor M1 connects supply voltage；The positive input terminal of the second rail-to-rail operation transconductance amplifier A2 is connected to base band input letter
Number Vin, the negative input end of the second rail-to-rail operation transconductance amplifier A2 is connected to the leakage of the first p-type MOS transistor M1
Pole, second resistance R2 is connected across between the positive-negative input end of the second rail-to-rail operation transconductance amplifier A2, the second rail-to-rail computing
The output end of trsanscondutance amplifier A2 is the digital baseband signal Vout for separating, and it is rail-to-rail that second resistance R2 is connected across second
Between the positive-negative input end of operation transconductance amplifier A2, comparison circuit is constituted.
The current value of the first current source I1 is certain, needed for being obtained by the resistance for choosing suitable 3rd resistor R3
Shift voltage value.Output signal Vf differs a displacement voltage value with input signal Vin, it is achieved thereby that the work(of voltage shift
Can, the voltage shifted in circuit of the invention is 150mV.
First p-type MOS transistor M1, the first electric capacity C1 and first resistor R1 constitute the charge circuit of feedback, when
It is brilliant by the first p-type metal oxide during the magnitude of voltage of the output end signal that the magnitude of voltage on the first electric capacity C1 is less than shift unit
Body pipe M1 charges to the first electric capacity C1；When magnitude of voltage of the voltage on the first electric capacity C1 more than the output end signal of shift unit,
First electric capacity C1 needs electric discharge, but because the resistance of the first resistor R1 in parallel with the first electric capacity C1 is larger, electric discharge is delayed very much
Slowly.So, after the regular hour, the magnitude of voltage at the first electric capacity C1 two ends just stabilizes to a constant value, after as shifting
Signal peak value, the peak value as in the present invention be used for comparator decision level Vc.In Fig. 2（a）In can clearly see
Go out the basic functional principle of peakvalue's checking of the invention, wherein incoming wave of the square wave of any dutycycle for shifted data separator
Shape, another waveform is the magnitude of voltage at electric capacity two ends, and the final waveform stabilization is the peak level of signal after displacement, as sentences
Certainly level.Input signal at the beginning and the decision level are connected respectively to the second rail-to-rail operation transconductance amplifier A2's
Positive and negative input, constitutes comparator circuit, is compared.When input signal is more than decision level, high level is output as, i.e.,
In for data signal 1；When input signal is less than decision level, low level, as 0 in data signal are output as.Finally,
The output of the second rail-to-rail operation transconductance amplifier A2 is the digital baseband signal Vout for separating.
Fig. 2 show the digital signal sequences for being represented with any dutycycle square-wave signal for receiving -65dBm and being received, figure
Middle Fig. 2（a）It is the input signal Vin of shifted data separator in the invention and voltage Vc at the first electric capacity C1 two ends, as this hair
Decision level in bright circuit.Fig. 2（b）It is the digital baseband signal Vout of comparator output.Can be clearly from the figure
To the course of work of peakvalue's checking of the invention, decision level is the level after the peak value displacement 150mV of input signal, can be seen
Very accurate can must also be detected to for the less signal present invention of signal amplitude, embody highly sensitive spy of the invention
Point.
Present invention improves over the production method of decision level；In addition, the present invention be by detect displacement after signal come
Decision level is arrived, the level shift in traditional structure is to realize that magnitude of voltage is the conduction voltage drop of diode by a diode
Voltage, the value is usually 0.6~0.7V, and the magnitude of voltage of displacement is larger, is unfavorable for obtaining effective decision level.And two pole
Pipe is difficult to realize that the integrated level according to diode is relatively low, and the requirement to supply voltage is also than larger in CMOS technology.At this
In invention, by the design of shift unit, the displacement of the voltage of 150mV is realized, the magnitude of voltage obtains size in actual application
In can arbitrarily adjust, therefore the scope of application is relatively broad.It is first present invention improves over the method that peakvalue's checking produces decision level
Level shifting operations first are carried out to detection signal, peakvalue's checking, result the sentencing as comparator of peakvalue's checking are then carried out again
Certainly level, so that can be with tradeoff design between comparator sensitivity and the dynamic range of demodulated signal.
The above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (1)
1. a kind of based on the OOK receiver data extractors for shifting peak-value detection method, OOK receivers data extractor is switch
The receiver separator of keyed amplitude modulation system；It is characterized in that：The analog baseband signal after filtering is set to pass through shift unit first
To realize the negatively shifted of voltage, the positive peak value of the signal after displacement is then detected, as decision level signal, finally will
The decision level signal and analog baseband signal by comparator compared with, obtain digital baseband signal, complete digital baseband
The extraction of signal, OOK receiver data extractors concrete structure include shift unit, the first rail-to-rail operation transconductance amplifier A1,
First p-type MOS transistor M1, the first electric capacity C1, first resistor R1, the second rail-to-rail operation transconductance amplifier A2 and
Second resistance R2；
Base-band input signal Vin is connected to the input of shift unit, and the output end Vf of shift unit is connected to the first rail-to-rail computing
The negative input end of trsanscondutance amplifier A1, one end of the first electric capacity C1 and one end of first resistor R1 are grounded, the first electric capacity C1's
The other end, the drain electrode of the other end of first resistor R1 and the first p-type MOS transistor M1 connect the first rail-to-rail computing
The positive input terminal of trsanscondutance amplifier A1, the output end of the first rail-to-rail operation transconductance amplifier A1 is connected to the first p-type metal oxygen
The grid of compound transistor M1, the source electrode of the first p-type MOS transistor M1 connects supply voltage；Second rail-to-rail computing across
The positive input terminal for leading amplifier A2 is connected to base-band input signal Vin, the negative input of the second rail-to-rail operation transconductance amplifier A2
End is connected to the drain electrode of the first p-type MOS transistor M1, and second resistance R2 is connected across the second rail-to-rail operation transconductance and puts
Between the positive-negative input end of big device A2, the output end of the second rail-to-rail operation transconductance amplifier A2 is the digital base separated
Band signal Vout；
The shift unit includes the 3rd rail-to-rail operation transconductance amplifier A3, the second p-type MOS transistor M2, the 3rd electricity
Resistance R3 and the first current source I1, base-band input signal Vin are connected to the negative input end of the 3rd rail-to-rail operation transconductance amplifier A3,
The output end of the 3rd rail-to-rail operation transconductance amplifier A3 is connected to the grid of the second p-type MOS transistor M2, the 2nd P
The source electrode of type MOS transistor M2 connects supply voltage, and the drain electrode of the second p-type MOS transistor M2 connects the 3rd electricity
Hinder one end of R3 and feed back to the positive input terminal of the 3rd rail-to-rail operation transconductance amplifier A3, the other end of 3rd resistor R3 connects
Be connected to the first current source I1, while as the output end Vf of shift unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410117068.8A CN103856430B (en) | 2014-03-26 | 2014-03-26 | A kind of OOK receiver data extractors based on displacement peak-value detection method |
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| CN201410117068.8A CN103856430B (en) | 2014-03-26 | 2014-03-26 | A kind of OOK receiver data extractors based on displacement peak-value detection method |
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| CN103856430B true CN103856430B (en) | 2017-06-06 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1077830A (en) * | 1993-06-04 | 1993-10-27 | 北京航空航天大学 | Forward floating reference type decision device |
| CN1741419A (en) * | 2004-08-27 | 2006-03-01 | 电子科技大学 | Optical burst mode receiver |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100603608B1 (en) * | 2003-10-29 | 2006-07-24 | 한국전자통신연구원 | Apparatus and method of demodulation to reduce time delay of on-channel repeater for terrestrial digital TV broadcasting system |
-
2014
- 2014-03-26 CN CN201410117068.8A patent/CN103856430B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1077830A (en) * | 1993-06-04 | 1993-10-27 | 北京航空航天大学 | Forward floating reference type decision device |
| CN1741419A (en) * | 2004-08-27 | 2006-03-01 | 电子科技大学 | Optical burst mode receiver |
Non-Patent Citations (1)
| Title |
|---|
| 基于APB总线的SPI控制器的设计;符宏利等;《电子世界》;20120215;113-115页,118页 * |
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