CN103927577A - Micropower high-sensitivity demodulator for forming RFID electronic tag and envelope detector - Google Patents
Micropower high-sensitivity demodulator for forming RFID electronic tag and envelope detector Download PDFInfo
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Abstract
The invention discloses a micropower high-sensitivity demodulator for forming an RFID electronic tag. The micropower high-sensitivity demodulator comprises an envelope detector, a ripple wave noise filter, an active low-pass filter and a hysteresis comparator and is characterized in that the input end of the envelope detector is connected with the radio-frequency signal input end, and the output end of the envelope detector is connected with the input end of the ripple wave noise filter and the input end of the active low-pass filter; envelope signals of radio-frequency signals are detected by the envelope detector and output to the ripple wave noise filter and the active low-pass filter; the output end of the ripple wave noise filter is connected to the positive end input of the hysteresis comparator; high-frequency noise and ripple waves of the received envelope signals are filtered through the ripple wave noise filter, and then the processed envelope signals are output to the hysteresis comparator; the output end of the active low-pass filter is connected with the negative end input of the hysteresis comparator, and the envelope signals output by the ripple wave noise filter are compared with direct-current reference voltage output by the active low-pass filter through the hysteresis comparator and then output in a CMOS electrical level mode.
Description
Technical field
The present invention relates to detuner and envelope detector, be specifically related to form micro-power consumption high sensitivity demodulator and the envelope detector of RFID electronic tag.
Background technology
Along with the fast development of passive radio frequency identification technique in field application such as traffic, gate inhibition's safety, identification, material handling, control automatically, Theft-proof and anti-counters, performance requirement to RFID electronic tag is more and more higher, is mainly reflected in the indexs such as sensitivity, power consumption and cost.And the quality of demodulator design quality is to determine whether RFID label chip has one of micro-power consumption, high sensitivity key factor.Existing passive RFID demodulator circuit structural sensitivity is low, and power consumption is higher, easily occurs distortion, affects the system performance of passive RFID electronic label.The detuner of traditional RFID electronic label chip adopts the circuit structure shown in Fig. 1 more.This structure has two shortcomings: first is R
dground connection can cause circuit power consumption larger, and second is to have ripple and negative peak clipping distortion.
The research direction of RFID detuner is by many-sides such as circuit structure or technique, devices, to reduce the power consumption of demodulator circuit at present, improves demodulation sensitivity, guarantees that signal is undistorted.As the metal-oxide-semiconductor circuit structure that adopts traditional RC parallel-connection structure or diode to connect is realized envelope detection.Yet, adopt RC parallel-connection structure, can cause detuner power consumption higher, and easily occur ripple and negative peak clipping distortion.When the metal-oxide-semiconductor of general-purpose diode type carries out envelope detection, only has the threshold voltage V that is greater than metal-oxide-semiconductor when the amplitude of RF signal
th(about 700mV), circuit could normally be worked, and therefore, receiving sensitivity is lower, has affected the communication distance of RFID.
Summary of the invention
One of technical matters to be solved by this invention is to provide the micro-power consumption high sensitivity demodulator that forms RFID electronic tag; Detuner power consumption is 0.3 μ W only, and demodulation sensitivity is up to-14dBm.
Two of technical matters to be solved by this invention is to provide the envelope detector that forms RFID electronic tag detuner.
First technical scheme of the present invention is that micro-power consumption high sensitivity demodulator of formation RFID electronic tag, comprises envelope detector, Ripple Noise wave filter, active low-pass filter, hysteresis comparator; It is characterized in that: the input end of envelope detector connects radio-frequency (RF) signal input end; The output terminal of envelope detector connects the input end of ripple noise filter and the input end of active low-pass filter; Described envelope detector detects the envelope signal of radiofrequency signal, outputs to Ripple Noise wave filter and active low-pass filter;
The output terminal of described Ripple Noise wave filter connects the anode input of hysteresis comparator; Described Ripple Noise wave filter will output to hysteresis comparator after the envelope signal filter away high frequency noise of receiving and ripple; The function of described Ripple Noise wave filter is in the situation that envelope signal is not attenuated, to suppress high frequency noise and ripple;
The output terminal of described active low-pass filter connects the negative terminal input of hysteresis comparator; Described active low-pass filter is undertaken taking out DC reference voltage after filtering by the envelope signal of receiving and outputs to hysteresis comparator;
Described hysteresis comparator is by the DC reference voltage comparison of the envelope signal of described Ripple Noise wave filter output and active low-pass filter output, then with CMOS level formal output; Adopt hysteresis comparator can better ignore input noise, and sluggish scope can be adjusted as required.
The function of detuner is by the demodulation of RF signal, recovers base-band information, for follow-up Base-Band Processing.
The present invention utilizes envelope detector to take out the envelope of RF signal, after Ripple Noise wave filter filter away high frequency noise and ripple, export envelope signal, after active low-pass filter filtering, take out DC reference voltage simultaneously, again by envelope signal and DC reference signal comparison, with CMOS level formal output, realize demodulation function.Circuit structure of the present invention is simple, and cost is low, volume is little, efficiency is high, performance is excellent, effectively improves sensitivity and the communication distance of RFID electronic tag.
The preferred version of micro-power consumption high sensitivity demodulator of formation RFID electronic tag of the present invention, described envelope detector comprises n level full wave rectifier and low-pass filter; The first input end of first order full wave rectifier connects radio-frequency (RF) signal input end, the second input end grounding, output terminal connects the second input end of second level full wave rectifier, the output terminal of second level full wave rectifier connects the second input end of third level full wave rectifier, the like, the output terminal of n-1 level full wave rectifier connects the second input end of n level full wave rectifier, the output terminal of n level full wave rectifier connects low-pass filter, and the first input end of the second level to the n-1 level, n level full wave rectifier all connects radio-frequency (RF) signal input end.This scheme utilizes n level full wave rectifier that rectifier output voltage is improved step by step, makes the amplitude of input signal RF_IN immediately very little, and envelope detector also can normally be worked, thereby improves demodulation sensitivity.
Another preferred version of micro-power consumption high sensitivity demodulator of formation RFID electronic tag of the present invention, described full wave rectifier comprises capacitance, filter capacitor, first, second schottky diode, one termination radio-frequency (RF) signal input end of capacitance, filter capacitor is connected between the negative pole and ground of the second schottky diode, the negative pole of the first schottky diode is connected with the positive pole of the second schottky diode, first, the connected node of the second schottky diode is connected with the other end of capacitance, the plus earth of the first schottky diode in first order full wave rectifier, the positive pole of the first schottky diode in the full wave rectifier of the second level connects the negative pole of the second schottky diode in first order full wave rectifier, the like, the positive pole of the first schottky diode in n level full wave rectifier connects the negative pole of the second schottky diode in n-1 level full wave rectifier, the negative pole of the second schottky diode in n level full wave rectifier connects low-pass filter.This scheme utilizes schottky diode to have less cut-in voltage characteristic, and utilize schottky diode to form n level full wave rectifier, full-wave rectification output voltage is improved step by step, can reduce effective forward voltage of schottky diode, while making the amplitude of input signal RF_IN be less than the forward conduction voltage of schottky diode, envelope detector also can normally be worked, thereby improves demodulation sensitivity.RFID detuner provided by the invention utilizes the envelope detector of Schottky diode structure to realize low distortion, micro-power consumption, high sensitivity characteristic.
Another preferred version of micro-power consumption high sensitivity demodulator of formation RFID electronic tag of the present invention, Ripple Noise wave filter consists of single order RC wave filter, can guarantee that envelope signal is not attenuated, and high frequency noise and ripple can effectively suppress, and can reduce ripple distortion.
Another preferred version of micro-power consumption high sensitivity demodulator of formation RFID electronic tag of the present invention, active low-pass filter consists of closed loop amplifier, and adopt voltage follower structure, make the input and output side of amplifier there is identical DC point, make the positive and negative input end of hysteresis comparator there is identical DC point, can reduce negative peak clipping distortion.
Another preferred version of micro-power consumption high sensitivity demodulator of formation RFID electronic tag of the present invention, hysteresis comparator consists of two stage amplifer.
Second technical scheme of the present invention is that the envelope detector of formation RFID electronic tag detuner, is characterized in: described envelope detector comprises n level full wave rectifier and low-pass filter; The first input end of first order full wave rectifier connects radio-frequency (RF) signal input end, the second input end grounding, output terminal connects the second input end of second level full wave rectifier, the output terminal of second level full wave rectifier connects the second input end of third level full wave rectifier, the like, the output terminal of n-1 level full wave rectifier connects the second input end of n level full wave rectifier, the output terminal of n level full wave rectifier connects low-pass filter, and the first input end of the second level to the n-1 level, n level full wave rectifier all connects radio-frequency (RF) signal input end.This scheme utilizes n level full wave rectifier that rectifier output voltage is improved step by step, makes the amplitude of input signal RF_IN immediately very little, and envelope detector also can normally be worked, thereby improves demodulation sensitivity.
According to the preferred version of the envelope detector of formation of the present invention RFID electronic tag detuner: described full wave rectifier comprises capacitance, filter capacitor, first, second schottky diode, one termination radio-frequency (RF) signal input end of capacitance, filter capacitor is connected between the negative pole and ground of the second schottky diode, the negative pole of the first schottky diode is connected with the positive pole of the second schottky diode, first, the connected node of the second schottky diode is connected with the other end of capacitance, the plus earth of the first schottky diode in first order full wave rectifier, the positive pole of the first schottky diode in the full wave rectifier of the second level connects the negative pole of the second schottky diode in first order full wave rectifier, the like, the positive pole of the first schottky diode in n level full wave rectifier connects the negative pole of the second schottky diode in n-1 level full wave rectifier, the negative pole of the second schottky diode in n level full wave rectifier connects low-pass filter.This scheme utilizes schottky diode to have less cut-in voltage characteristic, and utilize schottky diode to form n level full wave rectifier, full-wave rectification output voltage is improved step by step, can reduce effective forward voltage of schottky diode, while making the amplitude of input signal RF_IN be less than the forward conduction voltage of schottky diode, envelope detector also can normally be worked, thereby improves demodulation sensitivity.RFID detuner provided by the invention utilizes the envelope detector of Schottky diode structure to realize low distortion, micro-power consumption, high sensitivity characteristic.
Micro-power consumption high sensitivity demodulator of formation RFID electronic tag of the present invention and the beneficial effect of envelope detector are: the present invention utilizes envelope detector to take out the envelope of RF signal, after Ripple Noise wave filter filter away high frequency noise and ripple, export envelope signal, after active low-pass filter filtering, take out DC reference voltage simultaneously, again by envelope signal and DC reference signal comparison, with CMOS level formal output, realize demodulation function; Circuit structure of the present invention is simple, and cost is low, volume is little, efficiency is high, performance is excellent, effectively improves sensitivity and the communication distance of RFID electronic tag, has a good application prospect.RFID detuner provided by the invention utilizes the envelope detector of Schottky diode structure to realize low distortion, micro-power consumption, high sensitivity characteristic.The frequency of carrier signal scope that the present invention can realize RFID label chip is 840MHz～960MHz, and frequency modulating signal scope is 40KHz～160KHz, reach-14dBm of actual measurement demodulation sensitivity, and power consumption is 0.3 μ W only.
Accompanying drawing explanation
Fig. 1 is the theory diagram of traditional RFID detuner.
Fig. 2 is the theory diagram of the detuner that proposes of the present invention.
Fig. 3 is the theory diagram of envelope detector of the present invention
Fig. 4 is the schematic diagram of envelope detector.
Fig. 5 is the schematic diagram of active low-pass filter.
Fig. 6 is the schematic diagram of hysteresis comparator.
Fig. 7 is V in envelope detector
1, V
3, V
5the simulation waveform of voltage.
Fig. 8 is V in envelope detector
2, V
4the simulation waveform of voltage.
Fig. 9 is the simulation waveform of envelope detector output voltage and radio frequency input.
Figure 10 is modulation signal f
msimulation waveform during=160KHz.
Figure 11 is modulation signal f
msimulation waveform during=40KHz.
Embodiment
Referring to Fig. 2, form micro-power consumption high sensitivity demodulator of RFID electronic tag, by envelope detector 4, Ripple Noise wave filter 5, active low-pass filter 6 and hysteresis comparator 7, formed; The input end of described envelope detector 4 connects radio-frequency (RF) signal input end RF_IN; The output terminal of envelope detector 4 connects the input end of ripple noise filter 5 and the input end of active low-pass filter 6; Described envelope detector 4 detects the envelope signal of radiofrequency signal, outputs to Ripple Noise wave filter 5 and active low-pass filter 6;
The output terminal of described Ripple Noise wave filter 5 connects the anode input of hysteresis comparator 7; Described Ripple Noise wave filter 5 carries out the envelope signal of receiving to output to hysteresis comparator 7 after filter away high frequency noise and ripple;
The output terminal of described active low-pass filter 6 connects the negative terminal input of hysteresis comparator 7; Described active low-pass filter 6 is undertaken taking out DC reference voltage after filtering by the envelope signal of receiving and outputs to hysteresis comparator 7;
The output terminal of hysteresis comparator 7 connects demodulation output DEM_OUT; Described hysteresis comparator 7 is by the DC reference voltage comparison of the envelope signal of described Ripple Noise wave filter 5 outputs and active low-pass filter 6 outputs, then with CMOS level formal output.
Principle of work is that the envelope V that envelope detector 4 takes out RF signal exports envelope signal V after Ripple Noise wave filter 5 filter away high frequency noise and ripple
+, after active low-pass filter 6 filtering, take out DC reference voltage V simultaneously
-, by envelope signal V
+with DC reference signal V
-relatively, with CMOS level formal output, realize demodulation function.
Referring to Fig. 3, in specific embodiment, described envelope detector 4 comprises n level full wave rectifier and low-pass filter 11; The first input end of first order full wave rectifier connects radio-frequency (RF) signal input end RF_IN, the second input end grounding, output terminal connects the second input end of second level full wave rectifier, the output terminal of second level full wave rectifier connects the second input end of third level full wave rectifier, the like, the output terminal of n-1 level full wave rectifier connects the second input end of n level full wave rectifier, the output terminal of n level full wave rectifier connects low-pass filter 11, and the first input end of the second level to the n-1 level, n level full wave rectifier all connects radio-frequency (RF) signal input end RF_IN.The progression of full wave rectifier is determined by the sensitivity of envelope detector 4 and the forward conduction voltage of schottky diode.
Referring to Fig. 4, in specific embodiment, described full wave rectifier comprises capacitance, filter capacitor, first, second schottky diode, one termination radio-frequency (RF) signal input end RF_IN of capacitance, filter capacitor is connected between the negative pole and ground of the second schottky diode, the negative pole of the first schottky diode is connected with the positive pole of the second schottky diode, first, the connected node of the second schottky diode is connected with the other end of capacitance, the plus earth of the first schottky diode in first order full wave rectifier, the positive pole of the first schottky diode in the full wave rectifier of the second level connects the negative pole of the second schottky diode in first order full wave rectifier, the like, the positive pole of the first schottky diode in n level full wave rectifier connects the negative pole of the second schottky diode in n-1 level full wave rectifier, the negative pole of the second schottky diode in n level full wave rectifier connects low-pass filter 11.
Referring to Fig. 4, in specific embodiment, envelope detector 4 consists of three grades of full wave rectifiers 8,9,10 and one-level low-pass filter 11.First order full wave rectifier 8 comprises capacitance C
1, filter capacitor C
4, schottky diode S
1, S
2.Capacitance C
1a termination radiofrequency signal input RF_IN, another termination schottky diode S
1negative pole meet schottky diode S simultaneously
2positive pole.Schottky diode S
1plus earth, schottky diode S
2negative pole meet filter capacitor C
4one end meet second level full wave rectifier S simultaneously
3positive pole, filter capacitor C
4other end ground connection.Second level full wave rectifier 9 comprises capacitance C
2, filter capacitor C
5, schottky diode S
3, S
4.Capacitance C
2a termination radiofrequency signal input RF_IN, another termination schottky diode S
3negative pole meet schottky diode S simultaneously
4positive pole.Schottky diode S
4negative pole meet filter capacitor C
5one end meet third level full wave rectifier S simultaneously
5positive pole, filter capacitor C
5other end ground connection.Third level full wave rectifier 10 comprises capacitance C
3, filter capacitor C
6, schottky diode S
5, S
6.Capacitance C
3a termination radiofrequency signal input RF_IN, another termination schottky diode S
5negative pole meet schottky diode S simultaneously
6positive pole.Schottky diode S
6negative pole meet filter capacitor C
6one end connect resistance R in low-pass filter simultaneously
1one end, filter capacitor C
6other end ground connection.Resistance R in low-pass filter
1another termination filter capacitor C
7one end meet envelope detector output terminal DET_OUT, filter capacitor C simultaneously
7other end ground connection.
Principle of work is, radiofrequency signal from RF_IN input, during negative half-cycle, schottky diode S
1forward conduction, electric current passes through schottky diode S from ground
1flow to capacitor C
1, be capacitor C
1charging, during positive half period, schottky diode S
1reverse leakage, electric current is from capacitor C
1by schottky diode S
1flow to ground, capacitor C
1electric discharge.Due to schottky diode S
1forward conduction electric current be greater than reverse leakage current, so to capacitor C
1the integration of charging current is greater than C
1the integration of discharge current, therefore voltage V
1dC point can raise gradually.Along with V
1dC point raise, schottky diode S during negative half-cycle
1forward conduction electric current reduce, schottky diode S during positive half period
1reverse leakage current raise, when forward conduction electric current equals reverse leakage current, V
1dC point stabilize on the occasion of, V
1dC voltage rising can cause V
2dC voltage raise.In like manner after the full wave rectifier of the second level, V
3and V
4dC voltage raise, V
4dC voltage rising can cause V
5dC voltage raise, during steady state (SS), V
5>V
3>V
1>0, V
4>V
2>0, so V
4and V
5dC voltage be schottky diode S
5, S
6quiescent biasing is provided, has reduced schottky diode S
5, S
6effective forward voltage, therefore envelope detector is less than schottky diode S in radio-frequency input signals amplitude
5, S
6forward conduction voltage time, envelope detector also can normally be worked, thereby improves demodulation sensitivity.
In specific embodiment, referring to Fig. 2, Ripple Noise wave filter 5 consists of single order RC wave filter.
In specific embodiment, Ripple Noise wave filter 5 consists of single order RC wave filter, its time constant
can guarantee that envelope signal is not attenuated, and high frequency noise and ripple can effectively suppress.
In specific embodiment, referring to Fig. 5, active low-pass filter 6 consists of closed loop amplifier.This amplifier is two stage amplifer, adopts voltage follower structure, makes the input and output side of amplifier have identical DC point, amplifier loop gain is greater than 50dB, and three dB bandwidth is less than 50KHz, and phase margin is greater than 60 °, gain margin is greater than 20dB, can effectively take out DC reference voltage V
2, all metal-oxide-semiconductors are all operated in sub-threshold region to reduce power consumption, and the power consumption of whole element circuit is less than 0.1 μ W.
Referring to Fig. 6, hysteresis comparator 7 consists of two stage amplifer, and hysteresis comparator is by V
1and V
2voltage compares, with CMOS level formal output.Adopt hysteresis comparator can better ignore input noise, improve M
1/ M
3breadth length ratio ratio, can increase sluggish scope, but too high sluggish degree also means poor sensitivity and response speed, consider tradeoff between the two, determine M
1/ M
3breadth length ratio=1:1.Improve M
5the bias current of pipe, can improve the frequency of operation of hysteresis comparator, considers the factor of micro-power consumption, finally determines M
5the bias current of pipe is less than 200nA, and the power consumption of whole element circuit is less than 0.2 μ W.
simulation result
Referring to Fig. 7, be envelope detector V
1, V
3, V
5the simulation result that DC voltage improves step by step, simulated conditions is V
cC=1.2V, f
c=900MHz, P
rF=-16dBm.As seen from the figure, V
1, V
3, V
5dC voltage improves step by step, and voltage peak is respectively 543mV, 722.9mV, 905.8mV.Referring to Fig. 8, be V under same simulated conditions
2, V
4the simulation result that DC voltage improves step by step, as seen from the figure, V
2, V
4dC voltage improves step by step, and voltage peak is respectively 234.5mV, 413.8mV.Referring to Fig. 9, be the output waveform of same simulated conditions lower envelope wave detector, as seen from the figure, envelope detector has correctly detected the envelope of radiofrequency signal RF_IN, and output ripple and negative peak slicing are very less.
Referring to Figure 10, be modulation signal f
msimulation result during=160KHz, the V of the first half
1for the envelope signal of Ripple Noise wave filter output, V
2for the DC reference signal of active low-pass filter output, center section is detuner output signal, and the latter half is input RF_IN modulation signal.Referring to Figure 11, be modulation signal f
msimulation result during=40KHz, the first half is input RF modulation signal, and the latter half is detuner output signal, and simulated conditions is V
cC=1.2V, f
c=900MHz, P
rF=-16dBm.From upper two figure, demodulator function is normal, and the dutycycle of output signal is consistent with the dutycycle of input RF modulation signal, and distortion is less, and demodulation sensitivity simulation value is-16dBm that detuner power consumption simulation value is less than 0.3 μ W.
Table 1 is detuner measured result, and test condition is: frequency modulating signal f
mfor 40KHz～160KHz, carrier frequency f
cfor 900MHz, test result shows, when be less than-14dBm of carrier signal power input, and detuner cisco unity malfunction, when be more than or equal to-14dBm of carrier signal power input, detuner can correctly recover base-band information, therefore demodulation sensitivity measured value is-14dBm.
Table 1. detuner measured result
In sum, adopt detuner of the present invention, realized the characteristics such as micro-power consumption, low distortion, high sensitivity, effectively improve sensitivity and the communication distance of RFID electronic tag.
Referring to Fig. 3, Fig. 4. form the envelope detector of RFID electronic tag detuner, described envelope detector 4 comprises n level full wave rectifier and low-pass filter 11; The first input end of first order full wave rectifier connects radio-frequency (RF) signal input end RF_IN, the second input end grounding, output terminal connects the second input end of second level full wave rectifier, the output terminal of second level full wave rectifier connects the second input end of third level full wave rectifier, the like, the output terminal of n-1 level full wave rectifier connects the second input end of n level full wave rectifier, the output terminal of n level full wave rectifier connects low-pass filter 11, and the first input end of the second level to the n-1 level, n level full wave rectifier all connects radio-frequency (RF) signal input end RF_IN.
Described full wave rectifier comprises capacitance, filter capacitor, first, second schottky diode, one termination radio-frequency (RF) signal input end RF_IN of capacitance, filter capacitor is connected between the negative pole and ground of the second schottky diode, the negative pole of the first schottky diode is connected with the positive pole of the second schottky diode, first, the connected node of the second schottky diode is connected with the other end of capacitance, the plus earth of the first schottky diode in first order full wave rectifier, the positive pole of the first schottky diode in the full wave rectifier of the second level connects the negative pole of the second schottky diode in first order full wave rectifier, the like, the positive pole of the first schottky diode in n level full wave rectifier connects the negative pole of the second schottky diode in n-1 level full wave rectifier, the negative pole of the second schottky diode in n level full wave rectifier connects low-pass filter 11.
In specific embodiment, envelope detector 4 consists of three grades of full wave rectifiers 8,9,10 and one-level low-pass filter 11.First order full wave rectifier 8 comprises capacitance C
1, filter capacitor C
4, schottky diode S
1, S
2.Capacitance C
1a termination radiofrequency signal input RF_IN, another termination schottky diode S
1negative pole meet schottky diode S simultaneously
2positive pole.Schottky diode S
1plus earth, schottky diode S
2negative pole meet filter capacitor C
4one end meet second level full wave rectifier S simultaneously
3positive pole, filter capacitor C
4other end ground connection.Second level full wave rectifier 9 comprises capacitance C
2, filter capacitor C
5, schottky diode S
3, S
4.Capacitance C
2a termination radiofrequency signal input RF_IN, another termination schottky diode S
3negative pole meet schottky diode S simultaneously
4positive pole.Schottky diode S
4negative pole meet filter capacitor C
5one end meet third level full wave rectifier S simultaneously
5positive pole, filter capacitor C
5other end ground connection.Third level full wave rectifier 10 comprises capacitance C
3, filter capacitor C
6, schottky diode S
5, S
6.Capacitance C
3a termination radiofrequency signal input RF_IN, another termination schottky diode S
5negative pole meet schottky diode S simultaneously
6positive pole.Schottky diode S
6negative pole meet filter capacitor C
6one end connect resistance R in low-pass filter simultaneously
1one end, filter capacitor C
6other end ground connection.Resistance R in low-pass filter
1another termination filter capacitor C
7one end meet envelope detector output terminal DET_OUT, filter capacitor C simultaneously
7other end ground connection.
Above the specific embodiment of the present invention is described, still, the scope that is not limited only to embodiment of the present invention's protection.
Claims (8)
1. form micro-power consumption high sensitivity demodulator of RFID electronic tag, comprise envelope detector (4), Ripple Noise wave filter (5), active low-pass filter (6), hysteresis comparator (7); It is characterized in that: the input end of envelope detector (4) connects radio-frequency (RF) signal input end (RF_IN); The output terminal of envelope detector (4) connects the input end of ripple noise filter (5) and the input end of active low-pass filter (6); Described envelope detector (4) detects the envelope signal of radiofrequency signal, outputs to Ripple Noise wave filter (5) and active low-pass filter (6);
The output terminal of described Ripple Noise wave filter (5) connects the anode input of hysteresis comparator (7); Described Ripple Noise wave filter (5) carries out the envelope signal of receiving to output to hysteresis comparator (7) after filter away high frequency noise and ripple;
The output terminal of described active low-pass filter (6) connects the negative terminal input of hysteresis comparator (7); Described active low-pass filter (6) is undertaken taking out DC reference voltage after filtering by the envelope signal of receiving and outputs to hysteresis comparator (7);
Described hysteresis comparator (7) is by the DC reference voltage comparison of the envelope signal of described Ripple Noise wave filter (5) output and active low-pass filter (6) output, then with CMOS level formal output.
2. micro-power consumption high sensitivity demodulator of formation RFID electronic tag according to claim 1, is characterized in that: described envelope detector (4) comprises n level full wave rectifier and low-pass filter (11), the first input end of first order full wave rectifier connects radio-frequency (RF) signal input end (RF_IN), the second input end grounding, output terminal connects the second input end of second level full wave rectifier, the output terminal of second level full wave rectifier connects the second input end of third level full wave rectifier, the like, the output terminal of n-1 level full wave rectifier connects the second input end of n level full wave rectifier, the output terminal of n level full wave rectifier connects low-pass filter (11), the second level to the n-1 level, the first input end of n level full wave rectifier all connects radio-frequency (RF) signal input end (RF_IN).
3. micro-power consumption high sensitivity demodulator of formation RFID electronic tag according to claim 2, is characterized in that: described full wave rectifier comprises capacitance filter capacitor, first, second schottky diode, one termination radio-frequency (RF) signal input end (RF_IN) of capacitance, filter capacitor is connected between the negative pole and ground of the second schottky diode, the negative pole of the first schottky diode is connected with the positive pole of the second schottky diode, first, the connected node of the second schottky diode is connected with the other end of capacitance, the plus earth of the first schottky diode in first order full wave rectifier, the positive pole of the first schottky diode in the full wave rectifier of the second level connects the negative pole of the second schottky diode in first order full wave rectifier, the like, the positive pole of the first schottky diode in n level full wave rectifier connects the negative pole of the second schottky diode in n-1 level full wave rectifier, the negative pole of the second schottky diode in n level full wave rectifier connects low-pass filter (11).
4. according to micro-power consumption high sensitivity demodulator of the formation RFID electronic tag described in claim 1,2 or 3, it is characterized in that: Ripple Noise wave filter (5) consists of single order RC wave filter.
5. micro-power consumption high sensitivity demodulator of formation RFID electronic tag according to claim 4, is characterized in that: active low-pass filter (6) consists of closed loop amplifier.
6. micro-power consumption high sensitivity demodulator of formation RFID electronic tag according to claim 5, is characterized in that: hysteresis comparator (7) consists of two stage amplifer.
7. form the envelope detector of RFID electronic tag detuner, it is characterized in that: described envelope detector (4) comprises n level full wave rectifier and low-pass filter (11), the first input end of first order full wave rectifier connects radio-frequency (RF) signal input end (RF_IN), the second input end grounding, output terminal connects the second input end of second level full wave rectifier, the output terminal of second level full wave rectifier connects the second input end of third level full wave rectifier, the like, the output terminal of n-1 level full wave rectifier connects the second input end of n level full wave rectifier, the output terminal of n level full wave rectifier connects low-pass filter (11), the second level to the n-1 level, the first input end of n level full wave rectifier all connects radio-frequency (RF) signal input end (RF_IN).
8. the envelope detector of formation RFID electronic tag detuner according to claim 7, is characterized in that: described full wave rectifier comprises capacitance filter capacitor, first, second schottky diode, one termination radio-frequency (RF) signal input end (RF_IN) of capacitance, filter capacitor is connected between the negative pole and ground of the second schottky diode, the negative pole of the first schottky diode is connected with the positive pole of the second schottky diode, first, the connected node of the second schottky diode is connected with the other end of capacitance, the plus earth of the first schottky diode in first order full wave rectifier, the positive pole of the first schottky diode in the full wave rectifier of the second level connects the negative pole of the second schottky diode in first order full wave rectifier, the like, the positive pole of the first schottky diode in n level full wave rectifier connects the negative pole of the second schottky diode in n-1 level full wave rectifier, the negative pole of the second schottky diode in n level full wave rectifier connects low-pass filter (11).
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| CN104156760A (en) * | 2014-07-24 | 2014-11-19 | 斯凯瑞利（北京）科技有限公司 | Electronic tag and demodulator thereof |
| CN106096697A (en) * | 2016-06-17 | 2016-11-09 | 广州中大微电子有限公司 | A kind of RFID Micro Energy Lose high sensitivity demodulator circuit |
| CN109962871A (en) * | 2019-03-28 | 2019-07-02 | 四川中微芯成科技有限公司 | ASK amplitude-modulated signal envelope detected system |
| CN111368568A (en) * | 2018-12-26 | 2020-07-03 | 紫光同芯微电子有限公司 | Novel non-contact high-speed demodulation circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104156760A (en) * | 2014-07-24 | 2014-11-19 | 斯凯瑞利（北京）科技有限公司 | Electronic tag and demodulator thereof |
| CN104156760B (en) * | 2014-07-24 | 2015-12-09 | 斯凯瑞利（北京）科技有限公司 | Electronic tag and detuner thereof |
| CN106096697A (en) * | 2016-06-17 | 2016-11-09 | 广州中大微电子有限公司 | A kind of RFID Micro Energy Lose high sensitivity demodulator circuit |
| CN111368568A (en) * | 2018-12-26 | 2020-07-03 | 紫光同芯微电子有限公司 | Novel non-contact high-speed demodulation circuit |
| CN109962871A (en) * | 2019-03-28 | 2019-07-02 | 四川中微芯成科技有限公司 | ASK amplitude-modulated signal envelope detected system |
| CN109962871B (en) * | 2019-03-28 | 2021-07-23 | 四川中微芯成科技有限公司 | ASK amplitude modulation signal envelope detection system |
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Application publication date: 20140716 |