WO2019205629A1 - 放大电路和整流天线 - Google Patents

放大电路和整流天线 Download PDF

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Publication number
WO2019205629A1
WO2019205629A1 PCT/CN2018/118208 CN2018118208W WO2019205629A1 WO 2019205629 A1 WO2019205629 A1 WO 2019205629A1 CN 2018118208 W CN2018118208 W CN 2018118208W WO 2019205629 A1 WO2019205629 A1 WO 2019205629A1
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WIPO (PCT)
Prior art keywords
signal
output
rectifier
rectifying
pass filter
Prior art date
Application number
PCT/CN2018/118208
Other languages
English (en)
French (fr)
Inventor
丁天伦
孔祥忠
王磊
温垦
Original Assignee
京东方科技集团股份有限公司
北京京东方光电科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京东方科技集团股份有限公司, 北京京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to EP18915786.0A priority Critical patent/EP3787107A4/en
Priority to US16/607,828 priority patent/US11362630B2/en
Publication of WO2019205629A1 publication Critical patent/WO2019205629A1/zh
Priority to US17/745,033 priority patent/US11923814B2/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
    • H03F3/45475—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using IC blocks as the active amplifying circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/248—Supports; Mounting means by structural association with other equipment or articles with receiving set provided with an AC/DC converting device, e.g. rectennas
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19—High frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
    • H03F3/195—High frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45528—Indexing scheme relating to differential amplifiers the FBC comprising one or more passive resistors and being coupled between the LC and the IC
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45568—Indexing scheme relating to differential amplifiers the IC comprising one or more diodes as shunt to the input leads
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45594—Indexing scheme relating to differential amplifiers the IC comprising one or more resistors, which are not biasing resistor

Definitions

  • Embodiments of the present disclosure relate to an amplifying circuit and a rectifying antenna.
  • the rectifying antenna is a mainstream method of electromagnetic wave detection, and improving the sensitivity of the rectifying antenna is very helpful for effectively detecting electromagnetic waves.
  • methods to increase sensitivity include increasing antenna gain, reducing filter and rectifier losses, and using low-noise amplifiers.
  • Traditional rectennas are limited by antenna gain and transmission loss, so low-noise amplifiers are often used.
  • Increasing the sensitivity of electromagnetic wave detection, but the price of the antenna's low noise amplifier is quite high, thereby increasing the overall cost.
  • At least one embodiment of the present disclosure provides an amplifying circuit, including: a first rectifying circuit configured to output a first direct current signal according to an alternating current signal; and a second rectifying circuit configured to output a second direct current signal according to the alternating current signal; a differential amplifying circuit configured to receive the first DC signal and the second DC signal, and amplify a difference between the first DC signal and the second DC signal, and output the The first direct current signal and the second direct current signal are opposite in direction.
  • the first rectifying circuit includes a first input configured to input an alternating current signal and a first output configured to output the first direct current signal
  • the second rectifier circuit includes a second input configured to input an alternating current signal and a second output configured to output the second direct current signal.
  • the first rectifying circuit further includes a first rectifier connected between the first input end and the first output end, the first rectifying device being Configuring to perform half-wave rectification on the AC signal received thereto to output a first pulsating DC signal, the second rectifying circuit further comprising a second connection between the second input end and the second output end And a rectifier, the second rectifier configured to perform half-wave rectification on the received AC signal to output a second pulsed DC signal, the first pulsed DC signal and the second pulsed DC signal being opposite in direction.
  • the first rectifier includes a first rectifier diode, a positive pole of the first rectifier diode is grounded, and a cathode of the first rectifier diode is connected to the first input Between the end and the first output, the second rectifier comprises a second rectifier diode, the cathode of the second rectifier diode is grounded, and the anode of the second rectifier diode is connected to the second input terminal Between the second output.
  • the first rectifying circuit further includes a first band pass filter and a first low pass filter, and the first band pass filter is connected to the first Between the input end and the first rectifier, configured to band-pass filter an AC signal input from the first input terminal, and output the band-pass filtered signal to the first rectifier; a first low pass filter connected between the first rectifier and the differential amplifying circuit, configured to low pass filter the first pulsating DC signal output by the first rectifier to output the first DC signal.
  • the second rectifying circuit further includes a second band pass filter and a second low pass filter, and the second band pass filter is connected to the second Between the input end and the second rectifier, configured to band pass filter the AC signal input from the second input terminal, and output the band pass filtered signal to the second rectifier; a second low pass filter connected between the second rectifier and the differential amplifying circuit, configured to low pass filter the second pulsating DC signal output by the second rectifier to output the second DC signal.
  • the differential amplifying circuit includes a differential amplifier, and a forward input end of the differential amplifier is connected to an output end of the second rectifying circuit, and the difference is An inverting input of the operational amplifier is coupled to an output of the first rectifier circuit, and an output of the differential amplifier serves as an output of the differential amplifier circuit.
  • the differential amplifier includes an operational amplifier, a first resistor, a second resistor, a third resistor, and a fourth resistor, and one end of the first resistor and the operation
  • An inverting input of the amplifier is coupled to the other end as an inverting input of the differential amplifier
  • one end of the second resistor is coupled to the forward input of the operational amplifier, and the other end is coupled to the differential amplifier a positive input end
  • the two ends of the third resistor are respectively connected to the inverting input end and the output end of the operational amplifier
  • the two ends of the fourth resistor are respectively connected with the positive input end of the operational amplifier and the ground Connected
  • the output of the operational amplifier acts as the output of the differential amplifier.
  • At least one embodiment of the present disclosure also provides a rectifying antenna comprising: an antenna module configured to receive an electromagnetic wave signal and convert it into a corresponding alternating current signal; and a first rectifying circuit configured to generate an alternating current according to the antenna module The signal outputs a corresponding first DC signal; the second rectifier circuit is configured to output a corresponding second DC signal according to the AC signal generated by the antenna module; and a differential amplifying circuit configured to receive the first straight a stream signal and the second DC signal, and amplifying a difference between the first DC signal and the second DC signal, and outputting directions of the first DC signal and the second DC signal in contrast.
  • the antenna module includes two receiving antennas, and the two receiving antennas are connected in one-to-one correspondence with the first rectifying circuit and the second rectifying circuit.
  • the antenna module includes a receiving antenna and a power distribution unit connected to the receiving antenna, and the power distribution unit is configured to output an AC signal of the receiving antenna.
  • the two AC signals of the same power are equally divided, and the two AC signals are respectively output to the first rectifier circuit and the second rectifier circuit.
  • the power distribution unit includes two power splitters, and an input end of the two power splitters is connected to the receiving antenna, and two of the two power splitters The output ends are respectively connected to the first rectifier circuit and the second rectifier circuit.
  • the first rectifying circuit includes a first input configured to input an alternating current signal and a first output configured to output the first direct current signal
  • the second rectifier circuit includes a second input configured to input an alternating current signal and a second output configured to output the second direct current signal, the first input end and the second input end respectively
  • the antenna modules are connected.
  • the first rectifying circuit includes a first rectifier connected between the antenna module and the differential amplifying circuit, and the first rectifier is configured to Receiving the AC signal for half-wave rectification to output a first pulsating DC signal;
  • the first DC signal is the first pulsating DC signal or the first pulsating DC signal filtered signal,
  • the second The rectifier circuit includes a second rectifier connected between the antenna module and the differential amplifying circuit, the second rectifier configured to perform half-wave rectification on the received AC signal to output a second pulsating DC signal;
  • the second DC signal is a signal filtered by the second pulsating DC signal or the second pulsating DC signal.
  • the first rectifying circuit further includes a first band pass filter and a first low pass filter, and the first band pass filter is connected to the antenna module And the first rectifier is configured to perform band-pass filtering on the AC signal generated by the antenna module, and output the band-pass filtered signal to the first rectifier; the first low-pass filter
  • the device is connected between the first rectifier and the differential amplifying circuit, and is configured to low-pass filter the first pulsating DC signal output by the first rectifier to output the first DC signal.
  • the first rectifier includes a first rectifying diode, a positive pole of the first rectifying diode is grounded, and a negative pole and an output end of the first band pass filter The inputs of the first low pass filter are connected.
  • the second rectifying circuit further includes a second band pass filter and a second low pass filter, and the second band pass filter is connected to the antenna module Between the second rectifier and the second rectifier, configured to band-pass filter the AC signal generated by the antenna module, and output the band-pass filtered signal to the second rectifier; the second low-pass filter
  • the device is connected between the second rectifier and the differential amplifying circuit, and is configured to low-pass filter the second pulsating DC signal output by the second rectifier to output the second DC signal.
  • the second rectifier includes a second rectifying diode, a negative pole of the second rectifying diode is grounded, and an output terminal and a cathode of the second band pass filter are The inputs of the second low pass filter are connected.
  • the differential amplifying circuit includes a differential amplifier, and a forward input end of the differential amplifier is connected to an output end of the second rectifying circuit, and the difference is An inverting input of the operational amplifier is coupled to an output of the first rectifier circuit, and an output of the differential amplifier serves as an output of the differential amplifier circuit.
  • the differential amplifier includes an operational amplifier, a first resistor, a second resistor, a third resistor, and a fourth resistor, and one end of the first resistor and the operation
  • An inverting input of the amplifier is coupled to the other end as an inverting input of the differential amplifier
  • one end of the second resistor is coupled to the forward input of the operational amplifier, and the other end is coupled to the differential amplifier a positive input end
  • the two ends of the third resistor are respectively connected to the inverting input end and the output end of the operational amplifier
  • the two ends of the fourth resistor are respectively connected with the positive input end of the operational amplifier and the ground Connected
  • the output of the operational amplifier acts as the output of the differential amplifier.
  • FIG. 1 is a schematic block diagram of a rectifying antenna according to the present disclosure
  • FIG. 2 is a schematic structural diagram of a rectifying antenna according to the present disclosure
  • FIG. 3 is a schematic structural diagram of another rectifying antenna according to the present disclosure.
  • FIG. 4 is a schematic structural diagram of a module of an amplifying circuit according to an embodiment of the present disclosure
  • FIG. 5 is a schematic structural diagram of an amplifying circuit according to an embodiment of the present disclosure.
  • 10-antenna module 11-receiving antenna; 12-power distribution unit; 12a-two-power splitter; 20-first rectification circuit; 21-first band-pass filter; 22-first low-pass filter; First rectifier; 30-second rectifier circuit; 31-second bandpass filter; 32-second low-pass filter; 33-second rectifier; 40-differential amplifier circuit; 41-operation amplifier; An input terminal; 202-first output terminal; 301-second input terminal; 302-second output terminal.
  • Embodiments of the present disclosure provide an amplifying circuit and a rectifying antenna.
  • the amplifying circuit includes a first rectifying circuit configured to output a corresponding first DC signal according to the AC signal; the second rectifying circuit is configured to output a corresponding second DC signal according to the AC signal; the differential amplifying circuit is configured In order to receive the first DC signal and the second DC signal, and amplifying the difference between the first DC signal and the second DC signal, the first DC signal and the second DC signal are opposite in direction.
  • the amplifying circuit can increase the sensitivity of the rectifying antenna with a lower cost.
  • FIG. 1 is a schematic structural diagram of a rectifying antenna according to an embodiment of the present disclosure.
  • the rectifying antenna includes an antenna module 10 , a first rectifying circuit 20 , and a first The two rectifier circuit 30 and the differential amplifier circuit 40.
  • the antenna module 10 is configured to receive an electromagnetic wave signal and convert it into a corresponding alternating current signal, and in particular may include at least one receiving antenna.
  • the first rectifier circuit 20 is configured to output a corresponding first DC signal according to an AC signal generated by the antenna module 10.
  • the second rectifying circuit 30 is configured to output a corresponding second DC signal according to the AC signal generated by the antenna module 10; the first DC signal and the second DC signal are opposite in direction, that is, the first DC signal and The positive and negative of the second DC signal are opposite, and the two may be the same size or different.
  • the differential amplifying circuit 40 is configured to receive the first direct current signal and the second direct current signal, and amplify the difference between the first direct current signal and the second direct current signal and output the difference.
  • the output end of the differential amplifying circuit 40 serves as an output end of the rectifying antenna, and the rectifying antenna converts the electromagnetic wave signal into a direct current signal and amplifies it, so that the subsequent detector determines the magnitude of the electromagnetic wave by detecting the direct current signal.
  • the DC signal outputted by the antenna module 10 is rectified by the first rectifier circuit 20 and the second rectifier circuit 30 to form two DC signals with opposite positive and negative signals. Since the low noise in the two DC signals is very close, Therefore, when the two DC signals enter the differential amplifying circuit 40, the low noise can cancel at least a part of each other, and the DC component is amplified, thereby facilitating the subsequent detector to determine the magnitude of the electromagnetic wave, thereby facilitating the improvement of the electromagnetic wave detected by the rectifying antenna. Sensitivity.
  • the method for improving the sensitivity of the rectifying antenna of the present disclosure does not need to perform impedance matching, so that it can be applied to different antennas, and the cost of the differential amplifying circuit 40 is low, thereby reducing rectification.
  • the overall cost of the antenna compared with the method of using a low noise amplifier, the method for improving the sensitivity of the rectifying antenna of the present disclosure does not need to perform impedance matching, so that it can be applied to different antennas, and the cost of the differential amplifying circuit 40 is low, thereby reducing rectification. The overall cost of the antenna.
  • FIG. 2 is a schematic structural diagram of a rectifying antenna according to an embodiment of the present disclosure.
  • the rectifying antenna includes an antenna module 10, a first rectifying circuit 20, a second rectifying circuit 30, and a differential amplifying circuit 40.
  • the first DC signal is a forward signal
  • the second DC signal is a reverse signal.
  • the antenna module 10 includes two receiving antennas 11, and the two receiving antennas 11 are connected in one-to-one correspondence with the input ends of the two first rectifying circuits 20.
  • the receiving antenna 11 may specifically use a dipole antenna, a microstrip patch antenna, a sector antenna, or the like. Further, in order to reduce the size of the rectenna, the receiving antenna 11 may employ a compact antenna or a multilayer antenna structure.
  • the first rectifier circuit 20 can adopt a half-wave rectification manner, and specifically includes a first rectifier 23 (shown in FIG. 2) connected between the antenna module 10 and the differential amplifying circuit 40.
  • the first rectifier 23 is configured to be The received AC signal is half-wave rectified to output a first pulsating DC signal.
  • the connection between the first rectifier 23 and the antenna module 10 may be directly connected or indirectly connected; the connection between the first rectifier 23 and the differential amplifying circuit 40 may also be directly connected or indirectly connected, that is,
  • the first DC signal is the first pulsating DC signal or a filtered signal thereof.
  • the first rectifier 23 may specifically include a first rectifying diode, one of which is grounded, and the other is connected to the antenna module 10 and the differential amplifying circuit 40, and realizes half by the unidirectional conductivity of the first rectifying diode. Wave rectification.
  • the first rectifier diode can be a Schottky diode with better high frequency characteristics and switching performance.
  • the AC signal converted by the receiving antenna 11 has a plurality of different frequencies.
  • the first rectifying circuit 20 further includes a first band pass filter 21 and a first low pass filter 22.
  • a first band pass filter 21 is connected between the antenna module 10 and the first rectifier 23, configured to band-pass filter the AC signal generated by the antenna module 10, and is bandpass-filtered The signal is output to the first rectifier 23.
  • the first low pass filter 22 is connected between the first rectifier 23 and the differential amplifying circuit 40, and configured to low pass filter the first pulsating DC signal output by the first rectifier 23 to remove the first pulsating DC signal. The high frequency component, thereby improving the rectification efficiency.
  • the signal output by the first low pass filter 22 is the first DC signal.
  • the input end of the first band pass filter 21 is connected to one of the receiving antennas 11, and the output end is connected to the negative terminal of the first rectifier diode; the input end of the first low pass filter 22 is connected to the negative pole of the first rectifier diode.
  • the output terminal is connected to the negative input terminal of the differential amplifier circuit 40; the anode of the first rectifier diode is grounded.
  • the second rectifier circuit 30 also adopts a half-wave rectification manner.
  • the second rectifier circuit 30 includes a connection between the antenna module 10 and the differential amplifier circuit 40. a second rectifier 33 for half-wave rectifying the received AC signal to output a second pulsating DC signal; the second DC signal being the second pulsating DC signal or the The filtered signal of the two-pulse DC signal.
  • the second rectifier diode can be a Schottky diode with better high frequency characteristics and switching performance.
  • the second rectifier circuit 30 further includes a second band pass filter 31 and a second low pass filter 32.
  • the second band pass filter 31 is connected between the antenna module 10 and the second rectifier 33 for band-pass filtering the AC signal generated by the antenna module 10 and outputting the band-pass filtered signal to the second rectifier 33.
  • the second low pass filter 32 is connected between the second rectifier 33 and the differential amplifying circuit 40 for low-pass filtering the second pulsating DC signal output by the second rectifier 33 to remove the second pulsating DC signal. High frequency components to improve rectification efficiency.
  • the signal output by the second low pass filter 32 is the second DC signal.
  • the input end of the second band pass filter 31 is connected to the other receiving antenna 11, the output end is connected to the positive pole of the second rectifier diode; the input end of the second low pass filter 32 is connected to the anode of the second rectifier diode, The output terminal is connected to the forward input terminal of the differential amplifying circuit 40; the negative terminal of the second rectifier diode is grounded.
  • the structure of the first band pass filter 21 and the second band pass filter 31 are not limited, and both may be Butterworth band pass filters; the first low pass filter 22 and the second low pass filter 32 The structure is not limited, and the two may be a Butterworth low pass filter or a Chebyshev low pass filter.
  • the differential amplifying circuit 40 includes a differential amplifier whose forward input terminal is connected to an output terminal of the second rectifier circuit 30 (i.e., an output terminal of the second low pass filter 32), the differential amplifier The inverting input is coupled to the output of the first rectifier circuit 20 (i.e., the output of the first low pass filter 22), and the output of the differential amplifier serves as the output of the differential amplifier circuit 40.
  • the differential amplifier is specifically a four-resistor differential amplifier to simplify the structure of the differential amplifier.
  • the differential amplifier includes an operational amplifier 41, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4.
  • One end of the first resistor R1 is connected to the inverting input terminal of the operational amplifier 41, and the other end of the first resistor R1 serves as an inverting input terminal of the differential amplifier; one end of the second resistor R2 is connected to the forward input terminal of the operational amplifier 41.
  • the other end of the second resistor R2 forms a forward input end of the differential amplifier; the two ends of the third resistor R3 are respectively connected to the inverting input end and the output end of the operational amplifier 41; the two ends of the fourth resistor R4 are respectively The forward input of the operational amplifier 41 is coupled to ground; the output of the operational amplifier 41 forms the output of the differential amplifier.
  • the voltage V o of the DC signal at the output of the differential amplifier, the voltage V 1 at the output of the first rectifier circuit 20, the voltage V 2 at the output of the second rectifier circuit 30, the resistance R 1 of the first resistor R1, and the second resistor R2 the resistance R 2, the resistance of the third resistor R3 and the fourth resistor R4 R 3 R 4 satisfies the formula (1):
  • the resistance value of the first resistor R1 the second resistor R2 R 1 and R 2 may be equal to the resistance
  • the four-resistor differential amplifier is taken as an example, and the structure of the differential amplifier and the output voltage of the differential amplifier are described.
  • the present disclosure is not limited thereto, and the differential amplifier may adopt other structures.
  • a three-op amp differential amplifier may adopt other structures.
  • FIG. 3 is a schematic structural diagram of another rectifying antenna according to the present disclosure. 3 is different from the rectifying antenna of FIG. 2 only in the structure of the antenna module 10.
  • the antenna module 10 includes a receiving antenna 11 and a power distribution unit 12 connected to the receiving antenna 11, and power distribution.
  • the unit 12 is configured to equally divide the AC signal output by the receiving antenna 11 into two AC signals of the same power, and output the two AC signals to the first rectifier circuit 20 and the second rectifier circuit 30, respectively.
  • the power distribution unit 12 specifically includes two power splitters 12a. The input ends of the two power splitters 12a are connected to the receiving antenna 11, and the two output ends of the two power splitters 12a are respectively connected to the first rectifier circuit 20 and the second rectifier circuit.
  • the second power splitter 12a may specifically adopt a Wilkinson power splitter, a two-wire binary splitter, or the like having a simple structure.
  • the specific structures of the first rectifying circuit 20, the second rectifying circuit 30, and the differential amplifying circuit 40 are the same as those in the first configuration, and the voltage Vo outputted by the differential amplifying circuit 40 also satisfies the above formula ( 1), no more details here.
  • FIG. 4 is a block diagram of an amplifier circuit according to an embodiment of the present disclosure.
  • the amplifying circuit includes: a first rectifying circuit 20 configured to output a corresponding first DC signal according to the AC signal; and a second rectifying circuit 30 configured to output a corresponding second DC according to the AC signal a signal;
  • the differential amplifying circuit 40 is configured to receive the first DC signal and the second DC signal, and amplify the difference between the first DC signal and the second DC signal, and output the first DC signal and the first The two DC signals are in opposite directions.
  • the amplifying circuit In the amplifying circuit provided in this embodiment, after the AC signal is rectified by the first rectifying circuit 20 and the second rectifying circuit 30, two DC signals having opposite positive and negative signals are formed, and since the low noise in the two DC signals is very close, When the two DC signals enter the differential amplifying circuit 40, the low noise can cancel at least a part of each other, and the DC component is amplified, thereby facilitating the subsequent detector to determine the magnitude of the electromagnetic wave, thereby facilitating the improvement of the use of the embodiment.
  • the rectifying antenna of the amplifying circuit detects the sensitivity of the electromagnetic wave.
  • the amplifying circuit provided in this embodiment does not need to perform impedance matching, so that it can be applied to different antennas, and the cost of the differential amplifying circuit 40 is low, thereby reducing the overall cost of the rectifying antenna. .
  • FIG. 5 is a schematic structural diagram of another amplifying circuit according to an embodiment of the present disclosure.
  • the first rectifier circuit 20 includes a first input terminal 201 configured to input an AC signal and a first output terminal 202 configured to output a first DC signal
  • the second rectifier circuit 30 including A second input 301 that inputs an AC signal and a second output 302 that is configured to output a second DC signal.
  • the first rectifier circuit 20 further includes a first rectifier 23 connected between the first input terminal 201 and the first output terminal 202, the first rectifier 23 being configured to receive an AC signal thereto.
  • Half-wave rectification is performed to output a first pulsating DC signal
  • the second rectifying circuit 30 further includes a second rectifier 33 connected between the second input terminal 301 and the second output terminal 302, the second rectifier 33 being configured to
  • the received AC signal is half-wave rectified to output a second pulsating DC signal, and the first pulsating DC signal and the second pulsating DC signal are in opposite directions.
  • the first pulsating DC signal and the second pulsating DC signal are opposite in positive and negative, and the two may be the same size or different.
  • the first rectifier 23 includes a first rectifier diode 23, the anode of the first rectifier diode 23 is grounded, and the cathode of the first rectifier diode 23 is connected between the first input terminal 201 and the first output terminal 202.
  • the second rectifier 33 includes a second rectifier diode 33. The cathode of the second rectifier diode 33 is grounded, and the anode of the second rectifier diode 33 is connected between the second input terminal 301 and the second output terminal 302.
  • the first rectifier circuit 20 further includes a first band pass filter 21 and a first low pass filter 22, and the first band pass filter 21 is connected to the first input terminal 201 and the first rectifier 23 Between, it is configured to band-pass filter the AC signal input from the first input terminal 201, and output the band-pass filtered signal to the first rectifier 23; the first low-pass filter 22 is connected to the first rectifier Between the differential amplifier circuit 40 and the differential amplifier circuit 40, the first ripple DC signal output from the first rectifier 23 is low-pass filtered to output a first DC signal.
  • the first band pass filter 21 and the first low pass filter 22 refer to the related description of the foregoing embodiment, and details are not described herein again.
  • the second rectifier circuit 30 further includes a second band pass filter 31 and a second low pass filter 32, and the second band pass filter 31 is connected to the second input terminal 301 and the second rectifier 33. Between, it is configured to band-pass filter the AC signal input from the second input terminal 301, and output the band-pass filtered signal to the second rectifier 33; the second low-pass filter 32 is connected to the second rectifier Between 33 and the differential amplifying circuit 40, the second pulsating DC signal output from the second rectifier 33 is configured to be low-pass filtered to output a second DC signal.
  • the second band pass filter 31 and the second low pass filter 32 refer to the related description of the foregoing embodiment, and details are not described herein again.
  • the differential amplifying circuit 40 includes an operational amplifier 41, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4.
  • One end of the first resistor R1 is connected to the inverting input terminal of the operational amplifier 41, and the other end of the first resistor R1 serves as an inverting input terminal of the differential amplifier; one end of the second resistor R2 is connected to the forward input terminal of the operational amplifier 41.
  • the other end of the second resistor R2 forms a forward input end of the differential amplifier; the two ends of the third resistor R3 are respectively connected to the inverting input end and the output end of the operational amplifier 41; the two ends of the fourth resistor R4 are respectively The forward input of the operational amplifier 41 is coupled to ground; the output of the operational amplifier 41 forms the output of the differential amplifier.

Abstract

一种放大电路和整流天线。该放大电路包括：第一整流电路(20)，被配置为根据交流信号输出第一直流信号；第二整流电路(30)，被配置为根据交流信号输出第二直流信号；差动放大电路(40)，被配置为接收第一直流信号和第二直流信号，并将第一直流信号和第二直流信号的差值进行放大后输出，第一直流信号和第二直流信号的方向相反。该放大电路能够利用较低的成本提高整流天线的灵敏度。

Description

放大电路和整流天线
本申请要求于2018年04月25日递交的第201810378591.4号中国专利申请的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。
技术领域
本公开实施例涉及一种放大电路和整流天线。
背景技术
整流天线是电磁波检测的一种主流方式，而提高整流天线的灵敏度对于有效检测电磁波有很大的助益。一般来说，提高灵敏度的方法包含了增加天线增益、降低滤波器和整流器的损耗、及使用低噪声放大器，传统的整流天线因受限于天线增益和传输损耗，因此多会使用低噪声放大器来增加电磁波检测的灵敏度，但天线的低噪声放大器的售价相当高，从而增加整体成本。
发明内容
本公开至少一个实施例提供一种放大电路，其包括：第一整流电路，被配置为根据交流信号输出第一直流信号；第二整流电路，被配置为根据交流信号输出第二直流信号；差动放大电路，被配置为接收所述第一直流信号和所述第二直流信号，并将所述第一直流信号和所述第二直流信号的差值进行放大后输出，所述第一直流信号和所述第二直流信号的方向相反。
例如，在本公开一实施例提供的放大电路中，所述第一整流电路包括被配置为输入交流信号的第一输入端和被配置为输出所述第一直流信号的第一输出端，所述第二整流电路包括被配置为输入交流信号的第二输入端和被配置为输出所述第二直流信号的第二输出端。
例如，在本公开一实施例提供的放大电路中，所述第一整流电路还包括连接在所述第一输入端和所述第一输出端之间的第一整流器，所述第一整流器被配置为对其接收到的交流信号进行半波整流，以输出第一脉动直流信号，所述第二整流电路还包括连接在所述第二输入端和所述第二输出端之间的第二整流器，所述第二整流器被配置为对其接收到的交流信号进行半波整流，以输出 第二脉动直流信号，所述第一脉动直流信号和所述第二脉动直流信号的方向相反。
例如，在本公开一实施例提供的放大电路中，所述第一整流器包括第一整流二极管，所述第一整流二极管的正极接地，所述第一整流二极管的负极连接在所述第一输入端和所述第一输出端之间，所述第二整流器包括第二整流二极管，所述第二整流二极管的负极接地，所述第二整流二极管的正极连接在所述第二输入端和所述第二输出端之间。
例如，在本公开一实施例提供的放大电路中，所述第一整流电路还包括第一带通滤波器和第一低通滤波器，所述第一带通滤波器连接在所述第一输入端和所述第一整流器之间，被配置为对从所述第一输入端输入的交流信号进行带通滤波，并将经过带通滤波后的信号输出至所述第一整流器；所述第一低通滤波器连接在所述第一整流器与所述差动放大电路之间，被配置为对所述第一整流器输出的第一脉动直流信号进行低通滤波，以输出所述第一直流信号。
例如，在本公开一实施例提供的放大电路中，所述第二整流电路还包括第二带通滤波器和第二低通滤波器，所述第二带通滤波器连接在所述第二输入端和所述第二整流器之间，被配置为对从所述第二输入端输入的交流信号进行带通滤波，并将经过带通滤波后的信号输出至所述第二整流器；所述第二低通滤波器连接在所述第二整流器与所述差动放大电路之间，被配置为对所述第二整流器输出的第二脉动直流信号进行低通滤波，以输出所述第二直流信号。
例如，在本公开一实施例提供的放大电路中，所述差动放大电路包括差动放大器，所述差动放大器的正向输入端与所述第二整流电路的输出端相连，所述差动放大器的反向输入端与所述第一整流电路的输出端相连，所述差动放大器的输出端作为差动放大电路的输出端。
例如，在本公开一实施例提供的放大电路中，所述差动放大器包括运算放大器、第一电阻、第二电阻、第三电阻和第四电阻，所述第一电阻的一端与所述运算放大器的反向输入端相连，另一端作为所述差动放大器的反向输入端；所述第二电阻的一端与所述运算放大器的正向输入端相连，另一端作为所述差动放大器的正向输入端；所述第三电阻的两端分别与所述运算放大器的反向输入端和输出端相连；所述第四电阻的两端分别与所述运算放大器的正向输入端和地相连；所述运算放大器的输出端作为所述差动放大器的输出端。
本公开至少一个实施例还提供一种整流天线，包括：天线模块，被配置为 接收电磁波信号并将其转换为相应的交流信号；第一整流电路，被配置为根据所述天线模块产生的交流信号输出相应的第一直流信号；第二整流电路，被配置为根据所述天线模块产生的交流信号输出相应的第二直流信号；以及差动放大电路，被配置为接收所述第一直流信号和所述第二直流信号，并将所述第一直流信号和所述第二直流信号的差值进行放大后输出，所述第一直流信号和所述第二直流信号的方向相反。
例如，在本公开一实施例提供的整流天线中，所述天线模块包括两个接收天线，所述两个接收天线与所述第一整流电路和所述第二整流电路一一对应相连。
例如，在本公开一实施例提供的整流天线中，所述天线模块包括一个接收天线和与该接收天线相连的功率分配单元，所述功率分配单元被配置为将所述接收天线输出的交流信号均分为功率相同的两路交流信号，并将该两路交流信号分别输出至所述第一整流电路和所述第二整流电路。
例如，在本公开一实施例提供的整流天线中，所述功率分配单元包括二功分器，所述二功分器的输入端与所述接收天线相连，所述二功分器的两个输出端分别与所述第一整流电路和所述第二整流电路相连。
例如，在本公开一实施例提供的整流天线中，所述第一整流电路包括被配置为输入交流信号的第一输入端和被配置为输出所述第一直流信号的第一输出端，所述第二整流电路包括被配置为输入交流信号的第二输入端和被配置为输出所述第二直流信号的第二输出端，所述第一输入端和所述第二输入端分别与所述天线模组相连。
例如，在本公开一实施例提供的整流天线中，所述第一整流电路包括连接在所述天线模块与所述差动放大电路之间的第一整流器，该第一整流器被配置为对其接收到的交流信号进行半波整流，以输出第一脉动直流信号；所述第一直流信号为所述第一脉动直流信号或所述第一脉动直流信号滤波后的信号，所述第二整流电路包括连接在所述天线模块与所述差动放大电路之间的第二整流器，该第二整流器被配置为对其接收到的交流信号进行半波整流，以输出第二脉动直流信号；所述第二直流信号为所述第二脉动直流信号或所述第二脉动直流信号滤波后的信号。
例如，在本公开一实施例提供的整流天线中，所述第一整流电路还包括第一带通滤波器和第一低通滤波器，所述第一带通滤波器连接在所述天线模块和 所述第一整流器之间，被配置为对所述天线模块产生的交流信号进行带通滤波，并将经过带通滤波后的信号输出至所述第一整流器；所述第一低通滤波器连接在所述第一整流器与所述差动放大电路之间，被配置为对所述第一整流器输出的第一脉动直流信号进行低通滤波，以输出所述第一直流信号。
例如，在本公开一实施例提供的整流天线中，所述第一整流器包括第一整流二极管，所述第一整流二极管的正极接地，负极与所述第一带通滤波器的输出端和所述第一低通滤波器的输入端相连。
例如，在本公开一实施例提供的整流天线中，所述第二整流电路还包括第二带通滤波器和第二低通滤波器，所述第二带通滤波器连接在所述天线模块与所述第二整流器之间，被配置为对所述天线模块产生的交流信号进行带通滤波，并将经过带通滤波后的信号输出至所述第二整流器；所述第二低通滤波器连接在所述第二整流器与所述差动放大电路之间，被配置为对第二整流器输出的第二脉动直流信号进行低通滤波，以输出所述第二直流信号。
例如，在本公开一实施例提供的整流天线中，所述第二整流器包括第二整流二极管，所述第二整流二极管的负极接地，正极与所述第二带通滤波器的输出端和所述第二低通滤波器的输入端相连。
例如，在本公开一实施例提供的整流天线中，所述差动放大电路包括差动放大器，所述差动放大器的正向输入端与所述第二整流电路的输出端相连，所述差动放大器的反向输入端与所述第一整流电路的输出端相连，所述差动放大器的输出端作为差动放大电路的输出端。
例如，在本公开一实施例提供的整流天线中，所述差动放大器包括运算放大器、第一电阻、第二电阻、第三电阻和第四电阻，所述第一电阻的一端与所述运算放大器的反向输入端相连，另一端作为所述差动放大器的反向输入端；所述第二电阻的一端与所述运算放大器的正向输入端相连，另一端作为所述差动放大器的正向输入端；所述第三电阻的两端分别与所述运算放大器的反向输入端和输出端相连；所述第四电阻的两端分别与所述运算放大器的正向输入端和地相连；所述运算放大器的输出端作为所述差动放大器的输出端。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本公开的一些实施例，而 非对本公开的限制。
图1是根据本公开提供的一种整流天线的模块结构示意图；
图2是根据本公开提供的一种整流天线的结构示意图；
图3是根据本公开提供的另一种整流天线的结构示意图；
图4是根据本公开一实施例提供的一种放大电路的模块结构示意图；以及
图5为根据本公开一实施例提供的一种放大电路的结构示意图。
附图标记：
10-天线模块；11-接收天线；12-功率分配单元；12a-二功分器；20-第一整流电路；21-第一带通滤波器；22-第一低通滤波器；23-第一整流器；30-第二整流电路；31-第二带通滤波器；32-第二低通滤波器；33-第二整流器；40-差动放大电路；41-运算放大器；201-第一输入端；202-第一输出端；301-第二输入端；302-第二输出端。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例的附图，对本公开实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于所描述的本公开的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本公开保护的范围。
除非另外定义，本公开使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。本公开中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。“包括”或者“包含”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同，而不排除其他元件或者物件。“上”、“下”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也可能相应地改变。
本公开实施例提供一种放大电路和整流天线。该放大电路包括第一整流电路，被配置为根据交流信号输出相应的第一直流信号；第二整流电路，被配置为根据交流信号输出相应的第二直流信号；差动放大电路，被配置为接收第一直流信号和第二直流信号，并将第一直流信号和第二直流信号的差值进行放大后输出，第一直流信号和第二直流信号的方向相反。该放大电路能够利用较低 的成本提高整流天线的灵敏度。
下面，结合附图对本公开实施例提供的放大电路和整流天线进行详细的说明。
本公开一实施例提供一种整流天线，图1为本公开一实施例提供的整流天线的模块结构示意图，如图1所示，所述整流天线包括天线模块10、第一整流电路20、第二整流电路30和差动放大电路40。天线模块10被配置为接收电磁波信号并将其转换成相应的交流信号，具体可以包括至少一个接收天线。第一整流电路20被配置为根据天线模块10产生的交流信号输出相应的第一直流信号。第二整流电路30被配置为根据天线模块10产生的交流信号输出相应的第二直流信号；所述第一直流信号和所述第二直流信号的方向相反，即，第一直流信号和第二直流信号的正负相反，而二者大小可以相同，也可以有差异。差动放大电路40被配置为接收所述第一直流信号和所述第二直流信号，并将所述第一直流信号和所述第二直流信号的差值进行放大后输出。其中，差动放大电路40的输出端作为整流天线的输出端，所述整流天线将电磁波信号转换为直流信号并放大，以便于后续的检测器通过检测直流信号，而确定电磁波的大小。
在本实施例中，天线模块10输出的直流信号经过第一整流电路20和第二整流电路30整流后，形成正负相反的两个直流信号，由于两个直流信号中的低噪很接近，因此，当两个直流信号进入差动放大电路40后，低噪声可以相互抵消至少一部分，而直流成分被放大，从而有利于后续的检测器判断电磁波的大小，进而有利于提高整流天线检测电磁波的灵敏度。并且，和采用低噪声放大器的方式相比，本公开的提高整流天线灵敏度的方式不需要进行阻抗匹配，从而可以适用于不同的天线，且差动放大电路40的成本较低，从而可以降低整流天线的整体成本。
图2是本公开一实施例提供的一种整流天线的结构示意图。结合图1和图2所示，整流天线包括天线模块10、第一整流电路20、第二整流电路30和差动放大电路40。上述第一直流信号为正向信号，第二直流信号为反向信号。例如：
天线模块10包括两个接收天线11，两个接收天线11与两个第一整流电路20的输入端一一对应相连。接收天线11具体可以采用偶极子天线、微带贴片天线、扇形天线等。另外，为了减小整流天线的尺寸，接收天线11可以采用 结构紧凑的天线或多层天线结构。
第一整流电路20可以采用半波整流的方式，具体包括连接在天线模块10与差动放大电路40之间的第一整流器23(如图2所示)，该第一整流器23被配置为对其接收到的交流信号进行半波整流，以输出第一脉动直流信号。其中，第一整流器23与天线模块10之间的连接可以为直接相连，也可以为间接相连；第一整流器23与差动放大电路40之间的连接方式也可以为直接相连或间接相连，即，所述第一直流信号为所述第一脉动直流信号或其滤波后的信号。第一整流器23具体可以包括第一整流二极管，其正极和负极中的一者接地，另一者与天线模块10和差动放大电路40相连，通过第一整流二极管的单向导电性来实现半波整流。进一步例如，第一整流二极管可以为拥有更好高频特性和开关性能的肖特基二极管。
通常，接收天线11所转换得到的交流电信号具有多个不同的频率，为了筛选出工作频段的信号，第一整流电路20还包括第一带通滤波器21和第一低通滤波器22。第一带通滤波器21连接在所述天线模块10和所述第一整流器23之间，被配置为对所述天线模块10产生的交流信号进行带通滤波，并将经过带通滤波后的信号输出至所述第一整流器23。第一低通滤波器22连接在第一整流器23与差动放大电路40之间，被配置为对第一整流器23输出的第一脉动直流信号进行低通滤波，以去除第一脉动直流信号中的高频成分，从而提高整流效率。第一低通滤波器22输出的信号即为所述第一直流信号。其中，第一带通滤波器21的输入端与其中一个接收天线11相连，输出端与第一整流二极管的负极相连；第一低通滤波器22的输入端与第一整流二极管的负极相连，输出端与差动放大电路40的负向输入端相连；第一整流二极管的正极接地。
和第一整流电路20相同的，第二整流电路30也采用半波整流的方式，例如，如图2所示，第二整流电路30包括连接在天线模块10与差动放大电路40之间的第二整流器33，该第二整流器33用于对其接收到的交流信号进行半波整流，以输出第二脉动直流信号；所述第二直流信号为所述第二脉动直流信号或所述第二脉动直流信号滤波后的信号。第二整流二极管可以为拥有更好高频特性和开关性能的肖特基二极管。
进一步地，如图2所示，第二整流电路30还包括第二带通滤波器31和第二低通滤波器32。第二带通滤波器31连接在天线模块10与第二整流器33之 间，用于对天线模块10产生的交流信号进行带通滤波，并将经过带通滤波后的信号输出至第二整流器33。第二低通滤波器32连接在第二整流器33与差动放大电路40之间，用于对第二整流器33输出的第二脉动直流信号进行低通滤波，以去除第二脉动直流信号中的高频成分，从而提高整流效率。第二低通滤波器32输出的信号即为所述第二直流信号。其中，第二带通滤波器31的输入端与另一个接收天线11相连，输出端与第二整流二极管的正极相连；第二低通滤波器32的输入端与第二整流二极管的正极相连，输出端与差动放大电路40的正向输入端相连；第二整流二极管的负极接地。
其中，第一带通滤波器21和第二带通滤波器31的结构不作限定，二者可以均为巴特沃斯带通滤波器；第一低通滤波器22和第二低通滤波器32的结构也不作限定，二者可以为巴特沃斯低通滤波器或切比雪夫低通滤波器。
差动放大电路40包括差动放大器，所述差动放大器的正向输入端与第二整流电路30的输出端(即，第二低通滤波器32的输出端)相连，所述差动放大器的反向输入端与所述第一整流电路20的输出端(即，第一低通滤波器22的输出端)相连，所述差动放大器的输出端作为差动放大电路40的输出端。
其中，所述差动放大器具体为四电阻差动放大器，以简化差动放大器的结构。具体地，如图2所示，所述差动放大器包括运算放大器41、第一电阻R1、第二电阻R2、第三电阻R3和第四电阻R4。第一电阻R1的一端与运算放大器41的反向输入端相连，第一电阻R1的另一端作为差动放大器的反向输入端；第二电阻R2的一端与运算放大器41的正向输入端相连，第二电阻R2的另一端形成所述差动放大器的正向输入端；第三电阻R3的两端分别与运算放大器41的反向输入端和输出端相连；第四电阻R4的两端分别与运算放大器41的正向输入端和地相连；运算放大器41的输出端形成所述差动放大器的输出端。此时，差动放大器输出端的直流信号的电压V o、第一整流电路20输出端的电压V 1、第二整流电路30输出端的电压V 2、第一电阻R1的阻值R 1、第二电阻R2的阻值R 2、第三电阻R3的阻值R 3和第四电阻R4的R 4满足公式(1)：
Figure PCTCN2018118208-appb-000001
其中，第一电阻R1的阻值R 1和第二电阻R2的阻值R 2可以相等，第三电阻R3的阻值R 3和第四电阻R4的R 4可以相等，此时，V 0＝(R 3/R 1)*(V 2-V 1)。而由于电压V 2和V 1中的低噪成分相近，因此，V 2与V 1相减后可以将低噪抵消一 部分甚至完全消除。并且，通过相同的电压V 2和V 1正负相反，相减并与(R3/R1)相乘后得到放大的电压V 0。
可以理解的是，本实施例仅以四电阻差动放大器为例，对差动放大器的结构以及差动放大器输出电压进行了说明，然而本公开不局限于此，差动放大器也可以采用其他结构，例如，三运放差动放大器等。
图3是根据本公开提供的另一种整流天线的结构示意图。图3与图2的整流天线的区别仅在于天线模块10的结构不同，例如，如图3所示，天线模块10包括一个接收天线11和与该接收天线11相连的功率分配单元12，功率分配单元12被配置为将接收天线11输出的交流信号均分为功率相同的两路交流信号，并将该两路交流信号分别输出至第一整流电路20和第二整流电路30。其中，功率分配单元12具体包括二功分器12a，二功分器12a的输入端与接收天线11相连，二功分器12a的两个输出端分别与第一整流电路20和第二整流电路30相连，即，分别与第一带通滤波器21的输入端和第二带通滤波器31的输入端相连。二功分器12a具体可以采用结构简单的Wilkinson功分器、双线二分器等。
在第二种结构中，第一整流电路20、第二整流电路30和差动放大电路40的具体结构均和第一种结构中相同，差动放大电路40输出的电压Vo同样满足上述公式(1)，这里不再赘述。
本公开一实施例还提供一种放大电路。图4为根据本公开一实施例提供的放大电路的模块示意图。如图4所示，该放大电路包括：第一整流电路20，被配置为根据交流信号输出相应的第一直流信号；第二整流电路30，被配置为根据交流信号输出相应的第二直流信号；差动放大电路40，被配置为接收第一直流信号和第二直流信号，并将第一直流信号和第二直流信号的差值进行放大后输出，第一直流信号和第二直流信号的方向相反。
在本实施例提供的放大电路中，交流信号经过第一整流电路20和第二整流电路30整流后，形成正负相反的两个直流信号，由于两个直流信号中的低噪很接近，因此，当两个直流信号进入差动放大电路40后，低噪声可以相互抵消至少一部分，而直流成分被放大，从而有利于后续的检测器判断电磁波的大小，进而有利于提高采用本实施例提供的放大电路的整流天线检测电磁波的灵敏度。并且，和采用低噪声放大器相比，本实施例提供的放大电路不需要进行阻抗匹配，从而可以适用于不同的天线，且差动放大电路40的成本较低， 从而可以降低整流天线的整体成本。
图5为根据本公开一实施例提供的另一种放大电路的结构示意图。如图5所示，第一整流电路20包括被配置为输入交流信号的第一输入端201和被配置为输出第一直流信号的第一输出端202，第二整流电路30包括被配置为输入交流信号的第二输入端301和被配置为输出第二直流信号的第二输出端302。
例如，如图5所示，第一整流电路20还包括连接在第一输入端201和第一输出端202之间的第一整流器23，第一整流器23被配置为对其接收到的交流信号进行半波整流，以输出第一脉动直流信号，第二整流电路30还包括连接在第二输入端301和第二输出端302之间的第二整流器33，第二整流器33被配置为对其接收到的交流信号进行半波整流，以输出第二脉动直流信号，第一脉动直流信号和第二脉动直流信号的方向相反。第一脉动直流信号和第二脉动直流信号的正负相反，而二者大小可以相同，也可以有差异。
例如，如图5所示，第一整流器23包括第一整流二极管23，第一整流二极管23的正极接地，第一整流二极管23的负极连接在第一输入端201和第一输出端202之间，第二整流器33包括第二整流二极管33，第二整流二极管33的负极接地，第二整流二极管33的正极连接在第二输入端301和第二输出端302之间。第一整流二极管23和第二整流二极管33的具体结构可参见上述实施例的相关描述，在此不再赘述。
例如，如图5所示，第一整流电路20还包括第一带通滤波器21和第一低通滤波器22，第一带通滤波器21连接在第一输入端201和第一整流器23之间，被配置为对从第一输入端201输入的交流信号进行带通滤波，并将经过带通滤波后的信号输出至第一整流器23；第一低通滤波器22连接在第一整流器23与差动放大电路40之间，被配置为对第一整流器23输出的第一脉动直流信号进行低通滤波，以输出第一直流信号。第一带通滤波器21和第一低通滤波器22的具体结构可参见上述实施例的相关描述，在此不再赘述。
例如，如图5所示，第二整流电路30还包括第二带通滤波器31和第二低通滤波器32，第二带通滤波器31连接在第二输入端301和第二整流器33之间，被配置为对从第二输入端301输入的交流信号进行带通滤波，并将经过带通滤波后的信号输出至第二整流器33；第二低通滤波器32连接在第二整流器33与差动放大电路40之间，被配置为对第二整流器33输出的第二脉动直流信号进行低通滤波，以输出第二直流信号。第二带通滤波器31和第二低通滤波器 32的具体结构可参见上述实施例的相关描述，在此不再赘述。
例如，如图5所示，差动放大电路40包括运算放大器41、第一电阻R1、第二电阻R2、第三电阻R3和第四电阻R4。第一电阻R1的一端与运算放大器41的反向输入端相连，第一电阻R1的另一端作为差动放大器的反向输入端；第二电阻R2的一端与运算放大器41的正向输入端相连，第二电阻R2的另一端形成所述差动放大器的正向输入端；第三电阻R3的两端分别与运算放大器41的反向输入端和输出端相连；第四电阻R4的两端分别与运算放大器41的正向输入端和地相连；运算放大器41的输出端形成所述差动放大器的输出端。需要说明的是，差动放大器输出端的直流信号的电压V o、第一整流电路20输出端的电压V 1、第二整流电路30输出端的电压V 2、第一电阻R1的阻值R 1、第二电阻R2的阻值R 2、第三电阻R3的阻值R 3和第四电阻R4的R 4的关系可参见上述实施例的相关描述，在此不再赘述。
有以下几点需要说明：
(1)除非另作定义，本公开实施例以及附图中，同一标号代表同一含义。
(2)本公开实施例附图中，只涉及到与本公开实施例涉及到的结构，其他结构可参考通常设计。
(3)为了清晰起见，在用于描述本公开的实施例的附图中，层或区域被放大。可以理解，当诸如层、膜、区域或基板之类的元件被称作位于另一元件“上”或“下”时，该元件可以“直接”位于另一元件“上”或“下”，或者可以存在中间元件。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应以所述权利要求的保护范围为准。

Claims (20)

  1. 一种放大电路，包括：
    第一整流电路，被配置为根据交流信号输出第一直流信号；
    第二整流电路，被配置为根据交流信号输出第二直流信号；
    差动放大电路，被配置为接收所述第一直流信号和所述第二直流信号，并将所述第一直流信号和所述第二直流信号的差值进行放大后输出，
    其中，所述第一直流信号和所述第二直流信号的方向相反。
  2. 根据权利要求1所述的放大电路，其中，所述第一整流电路包括被配置为输入交流信号的第一输入端和被配置为输出所述第一直流信号的第一输出端，
    所述第二整流电路包括被配置为输入交流信号的第二输入端和被配置为输出所述第二直流信号的第二输出端。
  3. 根据权利要求2所述的放大电路，其中，所述第一整流电路还包括连接在所述第一输入端和所述第一输出端之间的第一整流器，所述第一整流器被配置为对其接收到的交流信号进行半波整流，以输出第一脉动直流信号，
    所述第二整流电路还包括连接在所述第二输入端和所述第二输出端之间的第二整流器，所述第二整流器被配置为对其接收到的交流信号进行半波整流，以输出第二脉动直流信号，
    其中，所述第一脉动直流信号和所述第二脉动直流信号的方向相反。
  4. 根据权利要求3所述的放大电路，其中，所述第一整流器包括第一整流二极管，所述第一整流二极管的正极接地，所述第一整流二极管的负极连接在所述第一输入端和所述第一输出端之间，
    所述第二整流器包括第二整流二极管，所述第二整流二极管的负极接地，所述第二整流二极管的正极连接在所述第二输入端和所述第二输出端之间。
  5. 根据权利要求3或4所述的放大电路，其中，所述第一整流电路还包括第一带通滤波器和第一低通滤波器，
    所述第一带通滤波器连接在所述第一输入端和所述第一整流器之间，被配置为对从所述第一输入端输入的交流信号进行带通滤波，并将经过带通滤波后的信号输出至所述第一整流器；
    所述第一低通滤波器连接在所述第一整流器与所述差动放大电路之间，被 配置为对所述第一整流器输出的第一脉动直流信号进行低通滤波，以输出所述第一直流信号。
  6. 根据权利要求3或4所述的放大电路，其中，所述第二整流电路还包括第二带通滤波器和第二低通滤波器，
    所述第二带通滤波器连接在所述第二输入端和所述第二整流器之间，被配置为对从所述第二输入端输入的交流信号进行带通滤波，并将经过带通滤波后的信号输出至所述第二整流器；
    所述第二低通滤波器连接在所述第二整流器与所述差动放大电路之间，被配置为对所述第二整流器输出的第二脉动直流信号进行低通滤波，以输出所述第二直流信号。
  7. 根据权利要求1至6中任一项所述的放大电路，其中，所述差动放大电路包括差动放大器，所述差动放大器的正向输入端与所述第二整流电路的输出端相连，所述差动放大器的反向输入端与所述第一整流电路的输出端相连，所述差动放大器的输出端作为差动放大电路的输出端。
  8. 根据权利要求7所述的放大电路，其中，所述差动放大器包括运算放大器、第一电阻、第二电阻、第三电阻和第四电阻，
    所述第一电阻的一端与所述运算放大器的反向输入端相连，另一端作为所述差动放大器的反向输入端；
    所述第二电阻的一端与所述运算放大器的正向输入端相连，另一端作为所述差动放大器的正向输入端；
    所述第三电阻的两端分别与所述运算放大器的反向输入端和输出端相连；
    所述第四电阻的两端分别与所述运算放大器的正向输入端和地相连；
    所述运算放大器的输出端作为所述差动放大器的输出端。
  9. 一种整流天线，包括：
    天线模块，被配置为接收电磁波信号并将其转换为交流信号；
    第一整流电路，被配置为根据所述天线模块产生的交流信号输出相应的第一直流信号；
    第二整流电路，被配置为根据所述天线模块产生的交流信号输出第二直流信号；以及
    差动放大电路，被配置为接收所述第一直流信号和所述第二直流信号，并将所述第一直流信号和所述第二直流信号的差值进行放大后输出，
    其中，所述第一直流信号和所述第二直流信号的方向相反。
  10. 根据权利要求9所述的整流天线，其中，所述天线模块包括两个接收天线，所述两个接收天线与所述第一整流电路和所述第二整流电路一一对应相连。
  11. 根据权利要求9所述的整流天线，其中，所述天线模块包括一个接收天线和与该接收天线相连的功率分配单元，所述功率分配单元被配置为将所述接收天线输出的交流信号均分为功率相同的两路交流信号，并将该两路交流信号分别输出至所述第一整流电路和所述第二整流电路。
  12. 根据权利要求11所述的整流天线，其中，所述功率分配单元包括二功分器，所述二功分器的输入端与所述接收天线相连，所述二功分器的两个输出端分别与所述第一整流电路和所述第二整流电路相连。
  13. 根据权利要求9-12中任一项所述的整流天线，其中，所述第一整流电路包括被配置为输入交流信号的第一输入端和被配置为输出所述第一直流信号的第一输出端，
    所述第二整流电路包括被配置为输入交流信号的第二输入端和被配置为输出所述第二直流信号的第二输出端，
    其中，所述第一输入端和所述第二输入端分别与所述天线模组相连。
  14. 根据权利要求9-13中任一项所述的整流天线，其中，所述第一整流电路包括连接在所述天线模块与所述差动放大电路之间的第一整流器，该第一整流器被配置为对其接收到的交流信号进行半波整流，以输出第一脉动直流信号；所述第一直流信号为所述第一脉动直流信号或所述第一脉动直流信号滤波后的信号，
    所述第二整流电路包括连接在所述天线模块与所述差动放大电路之间的第二整流器，该第二整流器被配置为对其接收到的交流信号进行半波整流，以输出第二脉动直流信号；所述第二直流信号为所述第二脉动直流信号或所述第二脉动直流信号滤波后的信号。
  15. 根据权利要求14所述的整流天线，其中，所述第一整流电路还包括第一带通滤波器和第一低通滤波器，
    所述第一带通滤波器连接在所述天线模块和所述第一整流器之间，被配置为对所述天线模块产生的交流信号进行带通滤波，并将经过带通滤波后的信号输出至所述第一整流器；
    所述第一低通滤波器连接在所述第一整流器与所述差动放大电路之间，被配置为对所述第一整流器输出的第一脉动直流信号进行低通滤波，以输出所述第一直流信号。
  16. 根据权利要求15所述的整流天线，其中，所述第一整流器包括第一整流二极管，所述第一整流二极管的正极接地，负极与所述第一带通滤波器的输出端和所述第一低通滤波器的输入端相连。
  17. 根据权利要求14-16中任一项所述的整流天线，其中，所述第二整流电路还包括第二带通滤波器和第二低通滤波器，
    所述第二带通滤波器连接在所述天线模块与所述第二整流器之间，被配置为对所述天线模块产生的交流信号进行带通滤波，并将经过带通滤波后的信号输出至所述第二整流器；
    所述第二低通滤波器连接在所述第二整流器与所述差动放大电路之间，被配置为对第二整流器输出的第二脉动直流信号进行低通滤波，以输出所述第二直流信号。
  18. 根据权利要求17所述的整流天线，其中，所述第二整流器包括第二整流二极管，所述第二整流二极管的负极接地，正极与所述第二带通滤波器的输出端和所述第二低通滤波器的输入端相连。
  19. 根据权利要求9-18中任一项所述的整流天线，其中，所述差动放大电路包括差动放大器，所述差动放大器的正向输入端与所述第二整流电路的输出端相连，所述差动放大器的反向输入端与所述第一整流电路的输出端相连，所述差动放大器的输出端作为差动放大电路的输出端。
  20. 根据权利要求19所述的整流天线，其中，所述差动放大器包括运算放大器、第一电阻、第二电阻、第三电阻和第四电阻，
    所述第一电阻的一端与所述运算放大器的反向输入端相连，另一端作为所述差动放大器的反向输入端；
    所述第二电阻的一端与所述运算放大器的正向输入端相连，另一端作为所述差动放大器的正向输入端；
    所述第三电阻的两端分别与所述运算放大器的反向输入端和输出端相连；
    所述第四电阻的两端分别与所述运算放大器的正向输入端和地相连；
    所述运算放大器的输出端作为所述差动放大器的输出端。
PCT/CN2018/118208 2018-04-25 2018-11-29 放大电路和整流天线 WO2019205629A1 (zh)

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