TWI742567B - Low-frequency receiver, tire pressure monitoring apparatus, and battery power supply system - Google Patents

Low-frequency receiver, tire pressure monitoring apparatus, and battery power supply system Download PDF

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TWI742567B
TWI742567B TW109108796A TW109108796A TWI742567B TW I742567 B TWI742567 B TW I742567B TW 109108796 A TW109108796 A TW 109108796A TW 109108796 A TW109108796 A TW 109108796A TW I742567 B TWI742567 B TW I742567B
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antenna
matching circuit
circuit
input signal
signal
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TW109108796A
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TW202035189A (en
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江瑋
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大陸商武漢杰開科技有限公司
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/02—Signalling devices actuated by tyre pressure
    • B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
    • B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
    • B60C23/0433—Radio signals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Transmitters (AREA)

Abstract

The present disclosure provides a low-frequency receiver and a tire pressure monitoring apparatus. The low-frequency receiver may include an antenna, a matching circuit, and a processing circuit. The antenna may be configured to receive an input signal. The matching circuit may be configured to connect to the antenna to form an antenna matching network with a preset quality factor. The processing circuit may be configured to connect to the matching circuit to process an input signal with the preset quality factor and generate a corresponding feedback signal according to a strength of the input signal, to adjust a resistance of the matching circuit, so as to adjust a gain of the input signal. In the above manner, the present disclosure may adjust the gain of the input signal by adjusting the quality factor of the antenna, so that an amplitude of the output signal may be stable in a preset range. Compared with a conventional architecture, power consumption may be reduced.

Description

一種低頻接收機以及胎壓監測設備、電池供電系統 Low-frequency receiver, tire pressure monitoring equipment, and battery power supply system

本發明涉及積體電路技術領域，具體涉及一種低頻接收機以及胎壓監測設備。本申請要求享有2019年03月19日提交的名稱為“一種低頻接收機以及胎壓監測設備”的中過專利申請CN201910207902.5的優先權，其全部內容通過引用併入本文中。 The invention relates to the technical field of integrated circuits, in particular to a low-frequency receiver and tire pressure monitoring equipment. This application claims the priority of the Zhonggu patent application CN201910207902.5 entitled "A low-frequency receiver and tire pressure monitoring equipment" filed on March 19, 2019, the entire content of which is incorporated herein by reference.

低頻喚醒在低功耗晶片中有著極其廣泛的應用，如胎壓監測系統(TPMS，Tire Pressure Monitoring System)；低頻喚醒接收機在TPMS中一般是觸發作用，其他觸發系統的方式還包括感測器或者計時器等模組；低頻喚醒接收機無法預計準確的使用時間，會被系統定時喚醒，其主要作用包括：通過手持設備觸發發射胎壓資料、通過手持設備觸發進行四輪定位、診斷系統問題以及更新客戶配置資料。其他電池供電的系統，如物聯網相關應用，功耗要求都極高，一些模組大部分時間處於待機模式，只是在需要時才會被觸發，所以採用低頻喚醒可以有效地減少功耗，達到延長系統壽命的目的；同時由於低 頻喚醒接收機本身每隔一定時間會工作一次，所以對其自身功耗要求也相當高。 Low-frequency wake-up has a very wide range of applications in low-power chips, such as Tire Pressure Monitoring System (TPMS); low-frequency wake-up receivers are generally used as triggers in TPMS, and other methods of triggering systems include sensors. Or modules such as timers; the low-frequency wake-up receiver cannot predict the accurate use time, and will be woken up by the system at regular intervals. Its main functions include: triggering the transmission of tire pressure data by the handheld device, four-wheel positioning by the handheld device, and diagnosing system problems And update customer configuration information. Other battery-powered systems, such as IoT-related applications, have extremely high power consumption requirements. Some modules are in standby mode most of the time and are only triggered when needed. Therefore, low-frequency wake-up can effectively reduce power consumption and achieve The purpose of prolonging the life of the system; at the same time due to the low The frequency wake-up receiver itself will work once every certain time, so its own power consumption requirements are quite high.

本發明的發明人在長期研發中發現，傳統的低頻接收機一般包括前端匹配的天線，輸出接一個主動式可變增益放大器(VGA，Variable Gain Amplifier)，再接線性放大器和自動增益控制電路，以實現對VGA的增益控制；當輸入訊號較大時，通過回授可以降低VGA的增益；反之，當輸入訊號較小時，通過回授可以增加VGA的增益，從而使得訊號通路輸出的訊號幅度在一定範圍內，單獨增加前端VGA可以實現精確調節，但該模組會增加功耗，不利於低功耗設計。 The inventors of the present invention have discovered in long-term research and development that traditional low-frequency receivers generally include a front-end matched antenna, and the output is connected to an active variable gain amplifier (VGA, Variable Gain Amplifier), a wiring amplifier and an automatic gain control circuit, In order to realize the gain control of the VGA; when the input signal is large, the gain of the VGA can be reduced by feedback; conversely, when the input signal is small, the gain of the VGA can be increased by the feedback, thereby making the signal amplitude of the signal path output Within a certain range, adding front-end VGA alone can achieve precise adjustment, but this module will increase power consumption, which is not conducive to low-power design.

本發明主要解決的問題是提供一種低頻接收機以及胎壓監測設備，能夠通過調整天線的品質因數來調整輸入訊號的增益，使得輸出訊號的幅度穩定在預設範圍內，與傳統結構相比降低了功耗。 The main problem to be solved by the present invention is to provide a low-frequency receiver and tire pressure monitoring equipment, which can adjust the gain of the input signal by adjusting the quality factor of the antenna, so that the amplitude of the output signal is stabilized within a preset range, which is lower than the traditional structure.了 Power consumption.

為解決上述技術問題，本發明採用的技術方案是提供一種低頻接收機，該低頻接收機包括：天線、匹配電路以及處理電路，天線用於接收輸入訊號；匹配電路連接天線，以構成具有預設品質因數的天線匹配網路；處理電路連接匹配電路，以處理具有預設品質因數的輸入訊號，並根據輸入訊號的大小而生成相應的回授訊號，以調整匹配電路的電阻，從而對輸入訊號的增益進行調整。 In order to solve the above technical problems, the technical solution adopted by the present invention is to provide a low frequency receiver. The low frequency receiver includes an antenna, a matching circuit and a processing circuit. The antenna is used to receive input signals; the matching circuit is connected to the antenna to form a preset Quality factor antenna matching network; the processing circuit is connected to the matching circuit to process the input signal with the preset quality factor, and generates the corresponding feedback signal according to the size of the input signal, so as to adjust the resistance of the matching circuit, and thus the input signal The gain is adjusted.

為解決上述技術問題，本發明採用的另一技術方案是提供一種胎壓監測設備，該胎壓監測設備包括發射機與接收機，發射機用於發射射頻胎壓訊號，接收機用於接收低頻訊號，其中，接收機為上述的接收機。 In order to solve the above technical problems, another technical solution adopted by the present invention is to provide a tire pressure monitoring device. The tire pressure monitoring device includes a transmitter and a receiver. The transmitter is used to transmit radio frequency tire pressure signals, and the receiver is used to receive low frequency tire pressure signals. Signal, where the receiver is the above-mentioned receiver.

為解決上述技術問題，本發明採用的另一技術方案是提供一種電池供電系統，該電池供電系統包括電池和電子裝置，電池用於為電子裝置供電，其中，電子裝置包括一接收機，接收機為上述的接收機。 In order to solve the above technical problems, another technical solution adopted by the present invention is to provide a battery power supply system. The battery power supply system includes a battery and an electronic device. The battery is used to power the electronic device. The electronic device includes a receiver. It is the above-mentioned receiver.

通過上述方案，本發明的有益效果是：本發明中的低頻接收機包括依次連接的天線、匹配電路以及處理電路，天線用於接收輸入訊號，匹配電路用於構成具有預設品質因數的天線匹配網路，處理電路用於處理具有預設品質因數的輸入訊號，並根據輸入訊號的大小而生成相應的回授訊號，利用回授訊號來調整匹配電路的電阻，從而對輸入訊號的增益進行調整，能夠通過調整天線的品質因數來調整輸入訊號的增益，使得輸出訊號的幅度穩定在預設範圍內，降低功耗。 Through the above solution, the beneficial effects of the present invention are: the low-frequency receiver of the present invention includes an antenna, a matching circuit, and a processing circuit connected in sequence. The antenna is used to receive input signals, and the matching circuit is used to form an antenna matching with a preset quality factor. Network, the processing circuit is used to process the input signal with the preset quality factor, and generate the corresponding feedback signal according to the size of the input signal. The feedback signal is used to adjust the resistance of the matching circuit to adjust the gain of the input signal , The gain of the input signal can be adjusted by adjusting the quality factor of the antenna, so that the amplitude of the output signal is stabilized within the preset range and power consumption is reduced.

11:天線 11: Antenna

12:匹配電路 12: matching circuit

13:處理電路 13: Processing circuit

21:天線 21: Antenna

22:匹配電路 22: matching circuit

221:第一匹配電路 221: first matching circuit

222:第二匹配電路 222: second matching circuit

2221:開關 2221: switch

23:處理電路 23: Processing circuit

231:限幅放大電路 231: Limiting amplifier circuit

2311:限幅放大器 2311: Limiting amplifier

232:回授電路 232: feedback circuit

2321:檢波電路 2321: Detector circuit

23211:幅度檢波器 23211: amplitude detector

2322:加法器 2322: adder

2323:跨導放大器 2323: transconductance amplifier

C:電容 C: Capacitance

C1:第一電容 C1: The first capacitor

C2:第二電容 C2: second capacitor

L:線圈 L: coil

L:電感 L: Inductance

R:電阻 R: resistance

R1:第一電阻 R1: first resistance

R2:第二電阻 R2: second resistor

R3:第三電阻 R3: third resistor

Rv:可變電阻 R v : variable resistance

61:發射機 61: Transmitter

62:接收機 62: receiver

63:天線 63: Antenna

64:數位處理電路 64: Digital processing circuit

65:中央處理器 65: central processing unit

70:電池供電系統 70: battery powered system

71:電池 71: battery

72:電子設備 72: electronic equipment

721:接收機 721: receiver

為了更清楚地說明本發明實施例中的技術方案，下面將對實施例描述中所需要使用的圖式作簡單地介紹，顯而易見地，下面描述中的圖式僅僅是本發明的一些實施例，對於本領域通常知識者來講，在不付出創造性勞動的前提下，還可以根據這些圖式獲得其他的圖式。 In order to explain the technical solutions in the embodiments of the present invention more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those who are generally knowledgeable in this field, they can also obtain other schemas based on these schemas without paying creative work.

第1圖系本發明提供的低頻接收機第一實施例的結構示意圖。 Figure 1 is a schematic structural diagram of the first embodiment of the low-frequency receiver provided by the present invention.

第2圖系本發明提供的低頻接收機第二實施例的結構示意圖。 Figure 2 is a schematic structural diagram of the second embodiment of the low-frequency receiver provided by the present invention.

第3圖系本發明提供的低頻接收機第三實施例中頻率與輸入訊號的曲線示意圖。 Fig. 3 is a schematic diagram of a curve between frequency and input signal in the third embodiment of the low-frequency receiver provided by the present invention.

第4圖系本發明提供的低頻接收機第四實施例中輸入訊號、回授訊號以及並聯電阻的波形示意圖。 Figure 4 is a schematic diagram of the waveforms of the input signal, the feedback signal and the parallel resistance in the fourth embodiment of the low-frequency receiver provided by the present invention.

第5圖系本發明提供的低頻接收機第五實施例的結構示意圖。 Figure 5 is a schematic structural diagram of a fifth embodiment of a low-frequency receiver provided by the present invention.

第6圖系本發明提供的胎壓監測設備的結構示意圖。 Figure 6 is a schematic diagram of the structure of the tire pressure monitoring equipment provided by the present invention.

第7圖系本發明提供的電池供電系統的結構示意圖。 Figure 7 is a schematic diagram of the structure of the battery power supply system provided by the present invention.

下面將結合本發明實施例中的圖式，對本發明實施例中的技術方案進行清楚、完整地描述，顯然，所描述的實施例僅僅是本發明一部分實施例，而不是全部實施例。基於本發明中的實施例，本領域通常知識者在沒有做出創造性的勞動前提下所獲得的所有其他實施例，都屬於本發明保護的範圍。 The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the protection scope of the present invention.

參閱第1圖，第1圖系本發明提供的低頻接收機第一實施例的結構示意圖，該低頻接收機包括：天線11、匹配電路12以及處理電路13。 Referring to Figure 1, Figure 1 is a schematic structural diagram of a first embodiment of a low-frequency receiver provided by the present invention. The low-frequency receiver includes an antenna 11, a matching circuit 12, and a processing circuit 13.

天線11用於接收輸入訊號，該輸入訊號可以為低頻訊號，例如，開關鍵控(OOK，On-Off Keying)訊號或者振幅偏移調變(ASK，Amplitude Shift Keying)訊號等，該低頻訊號的頻率一般可以為30kHz~300kHz，低頻訊號可以被放大和經電路處理後啟動整個胎壓監測系統。 The antenna 11 is used to receive an input signal. The input signal may be a low-frequency signal, for example, an On-Off Keying (OOK) signal or an Amplitude Shift Keying (ASK) signal. The frequency can generally be 30kHz~300kHz, and the low frequency signal can be amplified and processed by the circuit to start the entire tire pressure monitoring system.

匹配電路12連接天線11，其用以構成具有默認品質因數(Q值)的天線匹配網路，該匹配電路12可以與天線11進行匹配，品質因數代表了天線11的選擇特性，品質因數越小，傳輸頻寬越大， 曲線平坦，電路選擇性越差，品質因數越大，傳輸頻寬越窄，電路選擇性越好，但品質因數過高極易造成傳輸頻寬過窄，使得輸入訊號不能完全通過，從而造成訊號失真。 The matching circuit 12 is connected to the antenna 11 to form an antenna matching network with a default quality factor (Q value). The matching circuit 12 can be matched with the antenna 11. The quality factor represents the selection characteristics of the antenna 11. The smaller the quality factor , The greater the transmission bandwidth, The curve is flat, the circuit selectivity is worse, the quality factor is larger, the transmission bandwidth is narrower, the circuit selectivity is better, but the quality factor is too high, it is easy to cause the transmission bandwidth to be too narrow, so that the input signal cannot pass through completely, thus causing the signal distortion.

匹配電路12可以為被動式模組，天線11的品質因數要保證良好的選擇特性，對於品質因數較高的天線11可以通過匹配電路12有效地減小天線11的品質因數。 The matching circuit 12 may be a passive module, and the quality factor of the antenna 11 must ensure good selection characteristics. For the antenna 11 with a higher quality factor, the quality factor of the antenna 11 can be effectively reduced by the matching circuit 12.

處理電路13連接匹配電路12，其用以處理具有默認品質因數的輸入訊號，並根據輸入訊號的大小而生成相應的回授訊號，以調整匹配電路12的電阻，從而對輸入訊號的增益進行調整。 The processing circuit 13 is connected to the matching circuit 12, which is used to process an input signal with a default quality factor and generate a corresponding feedback signal according to the size of the input signal to adjust the resistance of the matching circuit 12, thereby adjusting the gain of the input signal .

本實施例中的低頻接收機可以應用於低功耗晶片或者電池供電晶片的低頻喚醒功能，通過調節匹配電路12的電阻，實現調整天線11的品質因數，從而調整輸入訊號的增益，實現自動增益控制，同時可以進一步降低功耗。 The low-frequency receiver in this embodiment can be applied to the low-frequency wake-up function of low-power chips or battery-powered chips. By adjusting the resistance of the matching circuit 12, the quality factor of the antenna 11 can be adjusted, thereby adjusting the gain of the input signal and realizing automatic gain. Control, and can further reduce power consumption at the same time.

本實施例提供了一種低頻接收機，該低頻接收機包括依次連接的天線11、匹配電路12以及處理電路13，天線11用於接收輸入訊號，匹配電路12用於構成具有預設品質因數的天線匹配網路，處理電路13用於處理具有預設品質因數的輸入訊號，並根據輸入訊號的大小而生成相應的回授訊號，利用回授訊號來調整匹配電路12的電阻，從而對輸入訊號的增益進行調整，能夠通過調整天線11的品質因數來調整輸入訊號的增益，使得輸出訊號的幅度穩定在預設範圍內。 This embodiment provides a low-frequency receiver. The low-frequency receiver includes an antenna 11, a matching circuit 12, and a processing circuit 13, which are sequentially connected. The antenna 11 is used to receive input signals, and the matching circuit 12 is used to form an antenna with a preset quality factor. Matching network, the processing circuit 13 is used to process the input signal with a preset quality factor, and generate a corresponding feedback signal according to the size of the input signal. The feedback signal is used to adjust the resistance of the matching circuit 12, so as to affect the input signal For gain adjustment, the gain of the input signal can be adjusted by adjusting the quality factor of the antenna 11, so that the amplitude of the output signal is stable within a preset range.

參閱第2圖，第2圖系本發明提供的低頻接收機第二實施例的結構示意圖，該低頻接收機包括：天線21、匹配電路22以及處理電路23。 Referring to FIG. 2, FIG. 2 is a schematic structural diagram of a second embodiment of a low-frequency receiver provided by the present invention. The low-frequency receiver includes an antenna 21, a matching circuit 22 and a processing circuit 23.

天線21用於接收輸入訊號，天線21包括線圈L，天線21採用線圈L直接耦合的方式。 The antenna 21 is used to receive input signals, the antenna 21 includes a coil L, and the antenna 21 adopts a method of directly coupling the coil L.

匹配電路22連接天線21，從而構成具有預設品質因數的天線匹配網路；該匹配電路22可以包括電容、電阻或開關等，在一具體的實施例中，該匹配電路22包括：第一匹配電路221和第二匹配電路222。 The matching circuit 22 is connected to the antenna 21 to form an antenna matching network with a preset quality factor; the matching circuit 22 may include a capacitor, a resistor, or a switch, etc., in a specific embodiment, the matching circuit 22 includes: a first matching The circuit 221 and the second matching circuit 222.

第一匹配電路221與天線21連接，其用於與天線21進行阻抗匹配；在一具體的實施例中，該第一匹配電路221包括與線圈L並聯的第一電阻R1和第一電容C1。 The first matching circuit 221 is connected to the antenna 21 and is used for impedance matching with the antenna 21; in a specific embodiment, the first matching circuit 221 includes a first resistor R1 and a first capacitor C1 connected in parallel with the coil L.

第二匹配電路222分別與第一匹配電路221以及處理電路23連接，其用於根據回授訊號而調節其接入221第一匹配電路和處理電路23的阻抗值，從而調整匹配電路22的阻抗；在一具體的實施例中，該第二匹配電路222包括：第二電阻R2、開關2221以及第三電阻R3。 The second matching circuit 222 is respectively connected to the first matching circuit 221 and the processing circuit 23, and is used to adjust the impedance value of the first matching circuit and the processing circuit 23 connected to 221 according to the feedback signal, thereby adjusting the impedance of the matching circuit 22 In a specific embodiment, the second matching circuit 222 includes: a second resistor R2, a switch 2221, and a third resistor R3.

第二電阻R2包括第一端和第二端，第二電阻R2的第一端與第一電容C1的一端連接。 The second resistor R2 includes a first end and a second end, and the first end of the second resistor R2 is connected to one end of the first capacitor C1.

開關2221包括第一端、第二端以及第三端，開關2221的第一端與第二電阻R2的第二端連接，開關2221的第二端與處理電路23的輸出端連接；開關2221可以為金屬氧化半導體場效應管。 The switch 2221 includes a first terminal, a second terminal, and a third terminal. The first terminal of the switch 2221 is connected to the second terminal of the second resistor R2, and the second terminal of the switch 2221 is connected to the output terminal of the processing circuit 23; the switch 2221 can It is a metal oxide semiconductor field effect tube.

第三電阻R3包括第一端和第二端，第三電阻R3的第一端與開關2221的第三端連接，第三電阻R3的第二端與第一電容C1的另一端連接，第三電阻R3的電阻值可以與第二電阻R2的電阻值相同。 The third resistor R3 includes a first end and a second end. The first end of the third resistor R3 is connected to the third end of the switch 2221, and the second end of the third resistor R3 is connected to the other end of the first capacitor C1. The resistance value of the resistor R3 may be the same as the resistance value of the second resistor R2.

開關2221為類比開關，其是否導通受控於處理電路23輸出的回授訊號，當回授訊號的電壓大於開關2221的閾值電壓Vth時，開關2221導通，開關2221的阻抗Ron較小，此時第二匹配電路222的總電阻值為第二電阻R2的電阻值、開關2221的阻抗Ron以及第三電阻R3的電阻值之和；當回授訊號的電壓小於於開關2221的閾值電壓Vth時，相比第二電阻R2和第三電阻R3的電阻值，此時開關2221的阻抗Ron無窮大，第二電阻R2和第三電阻R3兩者之間相當於斷路；因此可以根據回授訊號來調整其接入第一匹配電路221和處理電路23的阻抗值，從而調整匹配電路22的阻抗。 The switch 2221 is an analog switch, and whether it is turned on is controlled by the feedback signal output by the processing circuit 23. When the voltage of the feedback signal is greater than the threshold voltage V th of the switch 2221, the switch 2221 is turned on, and the impedance R on of the switch 2221 is small. at this time, the resistance value of the second matching circuit 222 total resistance value of the second resistor R2, the switch 2221 and the resistance R on the impedance value and the third resistor R3; when the threshold voltage is less than the feedback voltage signal to the switch 2221 when V th, the resistance value than the second resistor R2 and the third resistor R3, the switch 2221 at this time impedance R on infinity, corresponding to disconnection between the second resistor R2 and the third resistor R3; thus can back The instruction signal is used to adjust the impedance value connected to the first matching circuit 221 and the processing circuit 23, thereby adjusting the impedance of the matching circuit 22.

處理電路23連接匹配電路22，以處理具有默認品質因數的輸入訊號，並根據輸入訊號的大小而生成相應的回授訊號，以調整匹配電路22的電阻，從而對輸入訊號的增益進行調整，該處理電路23是一個負回授的閉合回路。 The processing circuit 23 is connected to the matching circuit 22 to process the input signal with the default quality factor, and generates a corresponding feedback signal according to the size of the input signal to adjust the resistance of the matching circuit 22, thereby adjusting the gain of the input signal. The processing circuit 23 is a closed loop with negative feedback.

進一步地，該處理電路23包括：限幅放大電路231和回授電路232。 Further, the processing circuit 23 includes: a limiting amplifier circuit 231 and a feedback circuit 232.

限幅放大電路231與匹配電路22的輸出端連接，其用於對輸入訊號進行放大，該限幅放大電路231可以包括多個依次連接的限幅放大器2311。 The limiting amplifier circuit 231 is connected to the output terminal of the matching circuit 22 and is used to amplify the input signal. The limiting amplifier circuit 231 may include a plurality of limiting amplifiers 2311 connected in sequence.

回授電路232與限幅放大電路231的輸出端連接，其用於根據放大後的輸入訊號生成回授訊號，並將回授訊號輸入至匹配電路22。 The feedback circuit 232 is connected to the output terminal of the limiting amplifier circuit 231, and is used to generate a feedback signal according to the amplified input signal, and input the feedback signal to the matching circuit 22.

在一具體的實施例中，該回授電路232包括：檢波電路2321、加法器2322、跨導放大器2323(OTA，Operational Transconductance Amplifier)以及第二電容C2。 In a specific embodiment, the feedback circuit 232 includes: a detection circuit 2321, an adder 2322, a transconductance amplifier 2323 (OTA, Operational Transconductance Amplifier), and a second capacitor C2.

檢波電路2321與限幅放大電路231的輸出端連接，其用於對放大後的輸入訊號進行處理，以得到放大後的輸入訊號中的有用訊號。 The detection circuit 2321 is connected to the output end of the limiting amplifier circuit 231, and is used to process the amplified input signal to obtain useful signals in the amplified input signal.

檢波電路2321包括多個依次連接的幅度檢波器23211，限幅放大器2311的數量與幅度檢波器23211的數量相同，每個限幅放大器2311的輸出端分別與一幅度檢波器23211的輸入端連接。 The detection circuit 2321 includes a plurality of amplitude detectors 23211 connected in sequence. The number of limit amplifiers 2311 is the same as the number of amplitude detectors 23211. The output end of each limit amplifier 2311 is connected to the input end of an amplitude detector 23211 respectively.

由於限幅放大器2311為差分放大器，第二匹配電路222與限幅放大器2311連接，為了與差分放大器的輸入端匹配，第二匹配電路222中包括兩個電阻值相同的第二電阻R2和第三電阻R3。 Since the limiting amplifier 2311 is a differential amplifier, the second matching circuit 222 is connected to the limiting amplifier 2311. In order to match with the input terminal of the differential amplifier, the second matching circuit 222 includes two second resistors R2 and a third resistor with the same resistance value. Resistance R3.

加法器2322與每個幅度檢波器23211的輸出端連接，其用於對幅度檢波器23211輸出的有用訊號進行迭加，以生成輸入跨導放大器2323的訊號，加法器2322能夠將幅度檢波器23211輸出訊號進行累加，生成電壓訊號RSSI(Received Signal Strength Indication，接收訊號強度指針)。 The adder 2322 is connected to the output end of each amplitude detector 23211, and is used to superimpose the useful signal output by the amplitude detector 23211 to generate the signal input to the transconductance amplifier 2323. The adder 2322 can convert the amplitude detector 23211 The output signal is accumulated to generate a voltage signal RSSI (Received Signal Strength Indication).

跨導放大器2323與檢波電路2321的輸出端連接，其用於根據有用訊號和參考訊號生成電流訊號。 The transconductance amplifier 2323 is connected to the output end of the detection circuit 2321, and is used to generate a current signal according to the useful signal and the reference signal.

第二電容C2與跨導放大器2323的輸出端連接，其用於接收電流訊號，以生成調整匹配電路22的電阻的電壓訊號。 The second capacitor C2 is connected to the output terminal of the transconductance amplifier 2323, and is used to receive a current signal to generate a voltage signal for adjusting the resistance of the matching circuit 22.

跨導放大器2323為差分輸入、單端輸出的放大器，其可以將差分輸入電壓轉換為輸出電流，而輸出電流會給第二電容C2進行充電，從而產生控制匹配電路22的電壓訊號；在一具體的實施例中，跨導放大器2323的輸入端用於接收加法器2322的輸出訊號以及參考訊號REF，參考訊號REF可以由電阻分壓得到；跨導放大器2323輸出穩定的電流為第二電容C2的電容進行充電，使得第二電容C2的電 壓逐漸升高，形成回授訊號，並將回授訊號輸入至開關2221的第二端，使得開關2221閉合，從而使得天線21的並聯電阻減小，使得輸入至處理電路23的訊號減小，降低輸入訊號的增益，實現輸入訊號的增益隨輸入訊號的強度而自動調整。 The transconductance amplifier 2323 is a differential input, single-ended output amplifier, which can convert the differential input voltage into an output current, and the output current will charge the second capacitor C2, thereby generating a voltage signal for controlling the matching circuit 22; In the embodiment, the input terminal of the transconductance amplifier 2323 is used to receive the output signal of the adder 2322 and the reference signal REF. The reference signal REF can be obtained by the resistor divider; the output of the transconductance amplifier 2323 is the stable current of the second capacitor C2 The capacitor is charged so that the electricity of the second capacitor C2 The voltage gradually increases to form a feedback signal, and the feedback signal is input to the second end of the switch 2221, so that the switch 2221 is closed, so that the parallel resistance of the antenna 21 is reduced, and the signal input to the processing circuit 23 is reduced. Reduce the gain of the input signal so that the gain of the input signal is automatically adjusted with the strength of the input signal.

在一具體的實施例中，假定輸入訊號的頻率為f0，即可以設定天線21和匹配電路22的諧振頻率為f0，其可以表示以下方程式。 In a specific embodiment, it is assumed that the frequency of the input signal is f 0 , that is, the resonant frequency of the antenna 21 and the matching circuit 22 can be set to f 0 , which can be expressed by the following equation.

Figure 109108796-A0305-02-0011-1
Figure 109108796-A0305-02-0011-1

其中，電感L和電容C分別表示線圈的電感值以及與其並聯的電容值。 Among them, the inductance L and the capacitance C respectively represent the inductance value of the coil and the capacitance value in parallel with it.

為了保證天線21和匹配電路22組成的天線匹配網路可以接收到輸入訊號，且滿足不失真的要求，使用Qmax表示天線匹配網路的品質因數的最高值，具體運算式如以下方程式。 In order to ensure that the antenna matching network composed of the antenna 21 and the matching circuit 22 can receive the input signal and meet the requirement of non-distortion, Q max is used to represent the highest value of the quality factor of the antenna matching network. The specific calculation formula is as follows.

Figure 109108796-A0305-02-0011-2
Figure 109108796-A0305-02-0011-2

其中，fc是載波頻率，△fc是載波頻率的容差(最大允許偏差)，△f0是諧振頻率的容差，BWsig表示訊號頻率，以上參數可根據實際應用選定。 Among them, fc is the carrier frequency, △fc is the tolerance of the carrier frequency (maximum allowable deviation), △f 0 is the tolerance of the resonance frequency, BW sig is the signal frequency, the above parameters can be selected according to the actual application.

對於最高品質因數Qmax來說，忽略線圈L的寄生並聯電阻，天線匹配網路的並聯電阻R可以表示為以下方程式。 For the highest quality factor Q max , ignoring the parasitic parallel resistance of the coil L, the parallel resistance R of the antenna matching network can be expressed as the following equation.

R=Q max * 2πf 0 * L (3) R = Q max * 2π f 0 * L (3)

常規天線匹配網路的設計中，計算各參數的順序如下：選定線圈L，獲取線圈L的電感值；由公式(1)得到天線21的並聯電容值，即第一電容C1的電容值；由公式(2)得到天線21的最高 品質因素Qmax；由公式(3)得到天線21的並聯電阻值，即第一匹配電路221中的電阻值或者第一匹配電路221與第二匹配電路222的並聯電阻值，天線匹配網路的品質因數可表示為以下方程式。 In the design of a conventional antenna matching network, the sequence of calculating various parameters is as follows: select the coil L and obtain the inductance value of the coil L; obtain the parallel capacitance value of the antenna 21 from the formula (1), that is, the capacitance value of the first capacitor C1; The formula (2) obtains the highest quality factor Q max of the antenna 21; the formula (3) obtains the parallel resistance value of the antenna 21, that is, the resistance value in the first matching circuit 221 or the first matching circuit 221 and the second matching circuit 222 The parallel resistance value and the quality factor of the antenna matching network can be expressed as the following equation.

Figure 109108796-A0305-02-0012-3
Figure 109108796-A0305-02-0012-3

由上式可知，天線21的並聯電阻R與品質因數是成正比的，在開關2221閉合時，第二匹配電路222會增加天線21的並聯電阻，使得天線21的整體並聯電阻降低，從而降低天線21的品質因數，實現天線21的輸出增益的改變。 It can be seen from the above formula that the parallel resistance R of the antenna 21 is proportional to the quality factor. When the switch 2221 is closed, the second matching circuit 222 will increase the parallel resistance of the antenna 21, reducing the overall parallel resistance of the antenna 21, thereby reducing the antenna The quality factor of 21 realizes the change of the output gain of the antenna 21.

加法器2322可以輸出RSSI訊號，該RSSI訊號與參考訊號REF同時輸入到跨導放大器2323中，跨導放大器2323輸出的電流給第二電容C2充電，產生模擬電壓訊號，該模擬電壓訊號輸入至匹配電路22，控制開關2221閉合，該開關2221可以為類比開關，由於開關2221的阻抗Ron具有隨控制電壓單調變化的特性，具體如以下方程式。 The adder 2322 can output an RSSI signal. The RSSI signal and the reference signal REF are simultaneously input to the transconductance amplifier 2323. The current output by the transconductance amplifier 2323 charges the second capacitor C2 to generate an analog voltage signal, which is input to the matching circuit 22, a control switch 2221 is closed, the analog switch may be a switch 2221, the switch 2221 has a characteristic impedance R on the control voltage varies monotonically with, particularly as the following equation.

Figure 109108796-A0305-02-0012-4
Figure 109108796-A0305-02-0012-4

其中，μn是載流子遷移率，Cox是單位面積柵氧化層電容，W和L分別是柵長和柵寬，VGS為柵極和源極之間的電壓差，VTH為閾值電壓。 Among them, μ n is the carrier mobility, Cox is the gate oxide capacitance per unit area, W and L are the gate length and gate width, respectively, V GS is the voltage difference between the gate and the source, and V TH is the threshold Voltage.

當源極和漏極之間的電壓差VDS=0時，開關2221的阻抗Ron與柵極和源極之間的電壓差VGS成反比，同時由於存在額外固定電阻，即第二電阻R2和第三電阻R3，因此整個天線21在開關2221閉合時的並聯電阻Rtot為：

Figure 109108796-A0305-02-0012-5
When the voltage difference between the source and the drain V DS =0, the impedance Ron of the switch 2221 is inversely proportional to the voltage difference V GS between the gate and the source, and at the same time due to the presence of an additional fixed resistance, that is, the second resistance R2 And the third resistance R3, so the parallel resistance R tot of the entire antenna 21 when the switch 2221 is closed is:
Figure 109108796-A0305-02-0012-5

Figure 109108796-A0305-02-0013-6
Figure 109108796-A0305-02-0013-6

回授訊號的電壓升高至開關2221的開啟電壓值時，第二匹配電路222連接在第一匹配電路221和限幅放大電路231之間，並聯電阻Rtot減小，並聯電阻Rtot隨回授訊號的電壓變化而反向變化，該阻抗的變化實現了對天線匹配網路的品質因數Qmatch的調節。例如，當檢測到RSSI訊號較大時，匹配電路22的開關2221可以導通，天線匹配網路的匹配品質因數減小，等效阻抗減小，輸入至處理電路23的訊號就會較低；反之，當檢測到RSSI訊號較小時，匹配電路22的開關2221是斷開狀態，所以第二匹配電路222中的第二電阻R2和第三電阻R3不會對天線匹配網路的品質因數產生影響。 When the voltage of the feedback signal rises to the turn-on voltage value of the switch 2221, the second matching circuit 222 is connected between the first matching circuit 221 and the limiting amplifier circuit 231, the parallel resistance R tot decreases, and the parallel resistance R tot follows The voltage of the grant signal changes in the opposite direction, and the change in impedance realizes the adjustment of the quality factor Q match of the antenna matching network. For example, when the RSSI signal is detected to be large, the switch 2221 of the matching circuit 22 can be turned on, the matching quality factor of the antenna matching network is reduced, the equivalent impedance is reduced, and the signal input to the processing circuit 23 will be lower; , When the RSSI signal is detected to be small, the switch 2221 of the matching circuit 22 is off, so the second resistor R2 and the third resistor R3 in the second matching circuit 222 will not affect the quality factor of the antenna matching network .

頻率與輸入訊號的曲線圖如第3圖所示，橫軸f0是諧振頻率，不同的並聯電阻Rtot對應不同的增益曲線，並聯電阻Rtot越大，品質因數越高，諧振頻點f0增益越高；輸入訊號與回授訊號以及並聯電阻的波形圖如第4圖所示，當處理電路23檢測到輸入訊號過大時會啟動匹配電路22，回授訊號便會變高，負回授給匹配電路22，輸入訊號由於匹配電路22的影響其幅度會逐漸變小，最終穩定在某一電壓值附近。 The graph of frequency and input signal is shown in Figure 3. The horizontal axis f 0 is the resonance frequency. Different parallel resistance R tot corresponds to different gain curves. The larger the parallel resistance Rt ot , the higher the quality factor, and the resonance frequency point f 0 The higher the gain; the waveform diagram of the input signal, the feedback signal and the parallel resistance is shown in Figure 4. When the processing circuit 23 detects that the input signal is too large, the matching circuit 22 will be activated, and the feedback signal will become high and negative feedback. Given to the matching circuit 22, the amplitude of the input signal will gradually decrease due to the influence of the matching circuit 22, and finally stabilize near a certain voltage value.

在其他具體的實施例中，匹配電路22還可以如第5圖所示，匹配電路22包括：並聯的第一電容C1和可變電阻Rv，可變電阻Rv的控制端與處理電路23的輸出端連接，以通過回授訊號調整可變電阻Rv的電阻值。 In other specific embodiments, the matching circuit 22 may also be as shown in Figure 5. The matching circuit 22 includes: a first capacitor C1 and a variable resistor Rv connected in parallel, a control terminal of the variable resistor Rv and a processing circuit 23 The output terminal is connected to adjust the resistance value of the variable resistor R v through the feedback signal.

此實施例中天線21的前端無匹配電阻，僅有線圈L，而影響天線匹配網路品質因數的並聯可變電阻Rv可以設置在處理電路23所在的晶片中，且可以根據處理電路23輸出的回授訊號而調整可 變電阻Rv的電阻值。可變電阻Rv可由帶類比開關2221的電阻網路實現，回授訊號會控制匹配電路22中的開關2221，實現整個前端天線匹配網路品質因數的調節，此時品質因數Qv可表示為：

Figure 109108796-A0305-02-0014-7
In this embodiment, the front end of the antenna 21 has no matching resistance, only the coil L, and the parallel variable resistance Rv that affects the quality factor of the antenna matching network can be set in the chip where the processing circuit 23 is located, and can be output according to the processing circuit 23 Adjust the resistance value of the variable resistor R v based on the feedback signal. The variable resistor R v can be realized by a resistor network with an analog switch 2221. The feedback signal will control the switch 2221 in the matching circuit 22 to adjust the quality factor of the entire front-end antenna matching network. At this time, the quality factor Q v can be expressed as :
Figure 109108796-A0305-02-0014-7

當並聯可變電阻Rv增大時，品質因數Qv會增大，此時輸入訊號增益也會大；反之當並聯可變電阻Rv減小時，品質因數Qv也會減小，此時輸入訊號增益也會減小，因而通過處理電路23的回授調整並聯可變電阻Rv即可實現增益的自動調節。 When the parallel variable resistor R v increases, the quality factor Q v will increase, and the input signal gain will also increase at this time; on the contrary, when the parallel variable resistor R v decreases, the quality factor Q v will also decrease. The gain of the input signal will also be reduced, so the automatic adjustment of the gain can be realized by adjusting the parallel variable resistor Rv through feedback of the processing circuit 23.

低頻接收機接收輸入訊號的動態範圍很高，不需要十分精確的動態增益控制，傳統方案採用主動式的VGA模組和複雜的模數轉換模組(ADC，Analog-to-Digital Converter)以及數位訊號處理模組(DSP，Digital Signal Processing)，VGA模組需要精確控制，主動式VGA設計較複雜，同時ADC模組以及DSP模組增加了設計難度和功耗，對電路版圖匹配要求較高，導致對晶片面積要求較高；而本實施例根據低頻接收機不需要精確控制動態增益的特點，通過調整天線21品質因數的方式實現動態增益控制，採用跨導放大器2323和第二電容C2便可控制被動式的匹配電路22，由於是模擬控制方式，只需控制類比開關2221的柵極，設計相對簡單，特別是被動式的匹配電路22容易設計，而跨導放大器2323和第二電容C2的功耗較低，無較高的匹配需求，可以有效地減小功耗和晶片面積，便於實現低功耗設計。 The low-frequency receiver has a high dynamic range for receiving the input signal and does not require very precise dynamic gain control. The traditional solution uses active VGA modules and complex analog-to-digital converter modules (ADC, Analog-to-Digital Converter) and digital Signal processing modules (DSP, Digital Signal Processing), VGA modules require precise control, active VGA design is more complicated, while ADC modules and DSP modules increase design difficulty and power consumption, and require higher circuit layout matching. This results in higher requirements for the chip area; however, in this embodiment, based on the feature that the low-frequency receiver does not need to accurately control the dynamic gain, the dynamic gain control is achieved by adjusting the quality factor of the antenna 21, using the transconductance amplifier 2323 and the second capacitor C2. Controlling the passive matching circuit 22, because it is an analog control method, only needs to control the gate of the analog switch 2221, the design is relatively simple, especially the passive matching circuit 22 is easy to design, and the power consumption of the transconductance amplifier 2323 and the second capacitor C2 Lower, no higher matching requirements, can effectively reduce power consumption and chip area, and facilitate the realization of low-power design.

參閱第6圖，第6圖系本發明提供的胎壓監測設備實施例的結構示意圖，該胎壓監測設備包括發射機61與接收機62，發射機61用於發射射頻胎壓訊號，接收機62用於接收低頻訊號，其中，接收機62為上述實施例中的接收機。 Referring to Figure 6, Figure 6 is a schematic structural diagram of an embodiment of a tire pressure monitoring device provided by the present invention. The tire pressure monitoring device includes a transmitter 61 and a receiver 62. The transmitter 61 is used to transmit radio frequency tire pressure signals, and the receiver 62 is used to receive low-frequency signals, where the receiver 62 is the receiver in the above-mentioned embodiment.

當發射機61發射射頻胎壓訊號時，接收機62通過電阻R、電容C以及電感L並聯組成的天線63接收低頻訊號，再經過數位處理電路64進行處理，判斷接收訊號的正確性，如果接收的訊號正確，接收機62就會喚醒中央處理器65(CPU，Central Processing Unit)，進行胎壓監測的操作，實現對汽車胎壓的監測和傳輸。 When the transmitter 61 transmits the radio frequency tire pressure signal, the receiver 62 receives the low frequency signal through the antenna 63 composed of resistor R, capacitor C and inductor L in parallel, and then processed by the digital processing circuit 64 to determine the correctness of the received signal. If the signal is correct, the receiver 62 will wake up the central processing unit 65 (CPU, Central Processing Unit) to perform the operation of tire pressure monitoring to realize the monitoring and transmission of the tire pressure of the automobile.

參閱第7圖，第7圖系本發明提供的電池供電系統的結構示意圖，該電池供電系統70包括電池71和電子設備72，電池71用於為電子設備72供電，其中，電子設備72包括接收機721，接收機721為上述實施例中的接收機；該電池供電系統可以應用於與物聯網相關的應用中。 Referring to Figure 7, Figure 7 is a schematic structural diagram of the battery power supply system provided by the present invention. The battery power supply system 70 includes a battery 71 and an electronic device 72. The battery 71 is used to supply power to the electronic device 72, wherein the electronic device 72 includes a receiver The receiver 721 and the receiver 721 are the receivers in the foregoing embodiment; the battery-powered system can be applied to applications related to the Internet of Things.

以上僅為本發明的實施例，並非因此限制本發明的專利範圍，凡是利用本發明說明書及圖式內容所作的等效結構或等效流程變換，或直接或間接運用在其他相關的技術領域，均同理包括在本發明的專利保護範圍內。 The above are only the embodiments of the present invention, and do not limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description and drawings of the present invention, or directly or indirectly applied to other related technical fields, The same reasoning is included in the scope of patent protection of the present invention.

11:天線 11: Antenna

12:匹配電路 12: matching circuit

13:處理電路 13: Processing circuit

Claims (10)

一種低頻接收機，包括：天線，用於接收輸入訊號；匹配電路，連接該天線，以構成具有預設品質因數的天線匹配網路，該匹配電路的電阻可以調節以調整該天線的品質因數來調整該輸入信號的增益；處理電路，連接該匹配電路，以處理具有預設品質因數的輸入訊號，並根據該輸入訊號的大小而生成相應的回授訊號，以調整該匹配電路的電阻，從而對該輸入訊號的增益進行調整。 A low-frequency receiver includes: an antenna for receiving input signals; a matching circuit connected to the antenna to form an antenna matching network with a preset quality factor; the resistance of the matching circuit can be adjusted to adjust the quality factor of the antenna Adjust the gain of the input signal; a processing circuit connected to the matching circuit to process an input signal with a preset quality factor, and generate a corresponding feedback signal according to the size of the input signal to adjust the resistance of the matching circuit, thereby Adjust the gain of the input signal. 根據申請專利範圍第1項的低頻接收機，其中，該匹配電路包括：第一匹配電路，與該天線連接，用於與該天線進行阻抗匹配；第二匹配電路，用於根據該回授訊號而調節其接入第一匹配電路和該處理電路的阻抗值，從而調整該匹配電路的阻抗。 The low-frequency receiver according to item 1 of the scope of patent application, wherein the matching circuit includes: a first matching circuit connected to the antenna for impedance matching with the antenna; and a second matching circuit for performing impedance matching with the antenna; The impedance value of the first matching circuit and the processing circuit is adjusted to adjust the impedance of the matching circuit. 根據申請專利範圍第2項的低頻接收機，其中，該天線包括線圈，該第一匹配電路包括並聯的第一電阻和第一電容，該第一電阻與該線圈並聯。 The low-frequency receiver according to item 2 of the scope of patent application, wherein the antenna includes a coil, the first matching circuit includes a first resistor and a first capacitor connected in parallel, and the first resistor is connected in parallel with the coil. 根據申請專利範圍第3項的低頻接收機，其中，該第二匹配電路包括：第二電阻，其包括第一端和第二端，該第二電阻的第一端與該第一電容的一端連接；開關，其包括第一端、第二端以及第三端，該開關的第一端與該第二電阻的第二端連接，該開關的第二端與該處理電路的輸出端連接；第三電阻，其包括第一端和第二端，該第三電阻的第一端與該開關的第三端連接，該第三電阻的第二端與該第一電容的另一端連接。 The low-frequency receiver according to item 3 of the scope of patent application, wherein the second matching circuit includes: a second resistor, which includes a first end and a second end, the first end of the second resistor and one end of the first capacitor Connection; a switch including a first end, a second end and a third end, the first end of the switch is connected to the second end of the second resistor, and the second end of the switch is connected to the output end of the processing circuit; A third resistor includes a first end and a second end, the first end of the third resistor is connected to the third end of the switch, and the second end of the third resistor is connected to the other end of the first capacitor. 根據申請專利範圍第1項的低頻接收機，其中，該匹配電路包括：並聯的第一電容和可變電阻，該可變電阻的控制端與該處理電路的輸出端連接，以通過該回授訊號調整該可變電阻的電阻值。 The low-frequency receiver according to item 1 of the scope of patent application, wherein the matching circuit includes a first capacitor and a variable resistor connected in parallel, and the control terminal of the variable resistor is connected to the output terminal of the processing circuit to pass the feedback The signal adjusts the resistance value of the variable resistor. 根據申請專利範圍第1項的低頻接收機，其中，該處理電路包括：限幅放大電路，與該匹配電路的輸出端連接，用於對該輸入訊號進行放大；回授電路，與該限幅放大電路的輸出端連接，用於根據放大後的該輸入訊號生成該回授訊號，並將該回授訊號輸出至該匹配電路。 According to the first item of the scope of patent application, the low frequency receiver, wherein the processing circuit includes: a limiting amplifier circuit connected to the output terminal of the matching circuit for amplifying the input signal; a feedback circuit, and the limiting amplifier circuit The output terminal of the amplifying circuit is connected to generate the feedback signal according to the amplified input signal, and output the feedback signal to the matching circuit. 根據申請專利範圍第6項的低頻接收機，其中，該回授電路包括：檢波電路，與該限幅放大電路的輸出端連接，用於對放大後的該輸入訊號進行處理，以得到放大後的該輸入訊號中的有用訊號；跨導放大器，與該檢波電路的輸出端連接，用於根據該有用訊號和參考訊號生成電流訊號；第二電容，與該跨導放大器的輸出端連接，用於接收該電流訊號，以生成調整該匹配電路的電阻的電壓訊號。 According to item 6 of the scope of patent application, the low-frequency receiver, wherein the feedback circuit includes: a detection circuit connected to the output terminal of the limiting amplifier circuit for processing the amplified input signal to obtain the amplified signal A useful signal in the input signal; a transconductance amplifier, connected to the output end of the detection circuit, for generating a current signal according to the useful signal and a reference signal; a second capacitor, connected to the output end of the transconductance amplifier, with After receiving the current signal, a voltage signal for adjusting the resistance of the matching circuit is generated. 根據申請專利範圍第7項的低頻接收機，該限幅放大電路包括多個依次連接的限幅放大器，其中，該檢波電路包括多個依次連接的幅度檢波器，該限幅放大器的數量與該幅度檢波器的數量相同，每個該限幅放大器的輸出端分別與一該幅度檢波器的輸入端連接。 According to the low-frequency receiver of item 7 of the scope of the patent application, the limiting amplifier circuit includes a plurality of limiting amplifiers connected in sequence, wherein the detection circuit includes a plurality of amplitude detectors connected in sequence, and the number of the limiting amplifiers is proportional to the The number of amplitude detectors is the same, and the output terminal of each limiting amplifier is respectively connected to an input terminal of the amplitude detector. 一種胎壓監測設備，包括發射機與接收機，該發射機用於發射射頻胎壓訊號，該接收機用於接收低頻訊號，其中，該接收機包括：天線，用於接收輸入訊號； 匹配電路，連接該天線，以構成具有預設品質因數的天線匹配網路，該匹配電路的電阻可以調節以調整該天線的品質因數來調整該輸入信號的增益；處理電路，連接該匹配電路，以處理具有預設品質因數的輸入訊號，並根據該輸入訊號的大小而生成相應的回授訊號，以調整該匹配電路的電阻，從而對該輸入訊號的增益進行調整。 A tire pressure monitoring device includes a transmitter and a receiver. The transmitter is used to transmit radio frequency tire pressure signals, and the receiver is used to receive low-frequency signals. The receiver includes: an antenna for receiving input signals; The matching circuit is connected to the antenna to form an antenna matching network with a preset quality factor. The resistance of the matching circuit can be adjusted to adjust the quality factor of the antenna to adjust the gain of the input signal; the processing circuit is connected to the matching circuit, To process an input signal with a preset quality factor, and generate a corresponding feedback signal according to the size of the input signal to adjust the resistance of the matching circuit, thereby adjusting the gain of the input signal. 一種電池供電系統，包括電池和電子裝置，該電池用於為該電子裝置供電，其中，該電子裝置包括一接收機，該接收機包括：天線，用於接收輸入訊號；匹配電路，連接該天線，以構成具有預設品質因數的天線匹配網路，該匹配電路的電阻可以調節以調整該天線的品質因數來調整該輸入信號的增益；處理電路，連接該匹配電路，以處理具有預設品質因數的輸入訊號，並根據該輸入訊號的大小而生成相應的回授訊號，以調整該匹配電路的電阻，從而對該輸入訊號的增益進行調整。 A battery power supply system includes a battery and an electronic device. The battery is used to supply power to the electronic device. The electronic device includes a receiver. The receiver includes an antenna for receiving input signals; a matching circuit connected to the antenna. , To form an antenna matching network with a preset quality factor, the resistance of the matching circuit can be adjusted to adjust the quality factor of the antenna to adjust the gain of the input signal; the processing circuit is connected to the matching circuit to process the preset quality Factor input signal, and generate a corresponding feedback signal according to the size of the input signal to adjust the resistance of the matching circuit, thereby adjusting the gain of the input signal.
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