Surface-mounted sampling phase-locked oscillator

By designing a surface-mounted sample-locked oscillator, using a microcontroller and other circuit components, the convenience of debugging of the dielectric resonator oscillator and the balance of low phase noise of the voltage-controlled oscillator is achieved, which solves the problems of inconvenient debugging and high phase noise in the prior art, and has the advantages of compact structure and low cost.

CN222563799UActive Publication Date: 2025-03-04CHENGDU LIXING TECH CO LTD
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Patent Information

Application Number
CN202421065771.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-16
Publication Date
2025-03-04
Estimated Expiration
2034-05-16

AI Technical Summary

Technical Problem

In the prior art, dielectric resonator oscillators are inconvenient in debugging, while voltage-controlled oscillators have high phase noise, making it difficult to take into account both the convenient modulation and low phase noise performance.

Method used

A surface sampling phase lock oscillator is designed, using a single chip computer, a phase detection circuit, a lock detection circuit, a preset voltage circuit and a power supply circuit. The components are compact through patch installation technology, and the preset voltage circuit and an op amp circuit are used to reduce noise, achieving easy debugging and low phase noise.

Benefits of technology

The oscillator is easy to adjust and low phase noise. The overall structure is compact, small in size, light in weight, simple in circuit structure and low in cost.

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Abstract

The utility model discloses a surface-mounted sampling phase-locked oscillator, which comprises a single chip microcomputer, a phase discrimination circuit, a locking detection circuit, a preset voltage circuit and an oscillator, the single-chip microcomputer is connected with the input end of a preset voltage circuit and the input end of an operational amplifier circuit, and the output end of the preset voltage circuit and the output end of the operational amplifier circuit are connected to the input end of an oscillator through a switching circuit formed by diodes. The oscillator is provided with two output ends, one output end is connected with the input end of the phase discrimination circuit, and the other output end outputs a radio frequency signal through the radio frequency amplifier; a reference signal and a sampled oscillator signal are respectively input into two input ends of the phase discrimination circuit, and the reference signal and the sampled oscillator signal are output to the locking detection circuit after phase discrimination; the preset voltage circuit adopts an analog integral circuit structure, and the preset voltage circuit outputs a preset voltage to the input end of the operational amplifier circuit; the single-chip microcomputer, the phase discrimination circuit, the locking detection circuit, the preset voltage circuit and the oscillator employ a paster installation technology.
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Description

Technical Field

[0001] The utility model relates to the technical field of radio, in particular to a surface-mounted sampling phase-locked oscillator. Background Art

[0002] Phase-Locked Dielectric Resonator Oscillator (PDRO) is a common frequency source that combines the advantages of dielectric resonator oscillator (DRO) and phase-locked loop (PLL) to provide an oscillation signal with high frequency stability, low phase noise and a wide frequency tuning range. Although the dielectric oscillator DRO has the advantages of high frequency stability, low noise, small size and low power consumption, it is not easy to debug.

[0003] A voltage-controlled oscillator (VCO) is an oscillation circuit whose oscillation frequency is controlled by an input control voltage. A voltage-controlled oscillator is usually used to generate a variable frequency signal, and the frequency of its output signal is proportional to the input control voltage. By adjusting the control voltage, the frequency of the carrier signal can be easily changed, thereby realizing functions such as frequency modulation or frequency synthesis. Compared with a dielectric oscillator (DRO), it is easier to debug, but its phase noise is relatively high. Utility Model Content

[0004] The utility model aims to provide a surface-mounted sampling phase-locked oscillator, which has the advantages of easy adjustment and low phase noise.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A surface-mounted sampling phase-locked oscillator comprises a single-chip microcomputer, a phase-detection circuit, a lock detection circuit, a preset voltage circuit, a power supply circuit, and an oscillator; the power supply circuit is connected to the single-chip microcomputer, the phase-detection circuit, the lock detection circuit, the preset voltage circuit, and the oscillator;

[0007] The single-chip microcomputer is connected to the input end of the preset voltage circuit and the operational amplifier circuit, and the output end of the preset voltage circuit and the operational amplifier circuit is connected to the input end of the oscillator through a switch circuit formed by a diode; the oscillator has two output ends, one of which is connected to the input end of the phase detection circuit, and the other output end outputs the radio frequency signal through the radio frequency amplifier; the two input ends of the phase detection circuit respectively input the reference signal and the sampled oscillator signal, and output them to the lock detection circuit after phase detection, and the lock detection circuit outputs positive feedback after locking judgment on the signal;

[0008] The preset voltage circuit adopts a preset voltage circuit of an analog integral circuit structure, and the preset voltage circuit outputs a preset voltage which is added to the input end of the operational amplifier circuit;

[0009] The single-chip microcomputer, phase-detection circuit, locking detection circuit, preset voltage circuit, power supply circuit and oscillator are respectively a single-chip microcomputer, phase-detection circuit, locking detection circuit, preset voltage circuit, power supply circuit and oscillator which adopt the surface mount mounting technology.

[0010] As a preferred technical solution, the phase detection circuit includes a transformer U8, the model of the transformer U8 is TC4-1W, and the pin 1 of the transformer U8 is connected to one end of the capacitor C53, one end of the capacitor C46, ​​and one end of the inductor L10; the other end of the capacitor C46 is connected to one end of the capacitor C45, the other end of the inductor L10, one end of the capacitor C52, and one end of the inductor L11; the other end of the capacitor C45 is connected to the other end of the inductor L11, one end of the capacitor C51, and one end of the capacitor C48; the other end of the capacitor C48 is connected to the other end of the inductor L11, one end of the capacitor C51, and one end of the capacitor C48. Connect one end of the inductor L8, the collector of the transistor U9, and one end of the resistor R30; the emitter of the transistor U9 is connected to one end of the resistor R35, and the other end of the resistor R35 is grounded; the base of the transistor U9 is connected to one end of the capacitor C50, one end of the resistor R27, and one end of the capacitor C54; the other end of the capacitor C50 is connected to the other end of the resistor R30; the other end of the capacitor C54 is connected to the 2nd pin of the attenuator R31; the reference voltage is input to the 1st pin of the attenuator R31, and the 3rd pin of the attenuator R31 is grounded; the attenuator R The model of 31 is PAT0510S-C-3DB-T10; the other end of resistor R27 is connected to one end of capacitor C29, one end of capacitor C38, and pin 2 of active bias controller U7; the other end of capacitor C38 is connected to the other end of capacitor C39 and grounded; pin 1 of active bias controller U7 is grounded, and pin 3 of active bias controller U7 is connected to one end of capacitor C43, one end of capacitor C41, one end of capacitor C42, one end of resistor R25, and one end of inductor L7; the other end of capacitor C43 The other end of the inductor L7 is connected to the other end of the capacitor C41 and the other end of the capacitor C42 and grounded; the other end of the inductor L7 is connected to the 3rd pin of the filter U6; the 2nd and 4th pins of the filter U6 are grounded; the 1st pin of the filter U6 is connected to the +9V common terminal; the model of the filter U6 is NFM21HC471R1H3; the 4th pin of the active bias controller U7 is connected to one end of the capacitor C36, the other end of the resistor R25, one end of the capacitor C37, and the other end of the inductor L8; the other end of the capacitor C36 and the other end of the capacitor C37 are grounded;

[0011] Pin 6 of transformer U8 is connected to one end of capacitor C49, and the other end of capacitor C49 is connected to one end of resistor R32, one end of capacitor C44, and pin 1 of sampling phase detector to D3; the model of sampling phase detector to D3 is MSPD2018; pin 2 of sampling phase detector to D3 is connected to the other end of capacitor C44, one end of resistor R26, and one end of capacitor C40, and the other end of capacitor C40 is connected to pin 4 of transformer U8; the other ends of resistor R32 and resistor R26 are grounded;

[0012] The sampling phase detector to the 4th pin of D3 is connected to one end of the resistor R28 and one end of the capacitor C47; the other end of the resistor R28 is the VC port connected to the lock detection circuit; the other end of the capacitor C47 is connected to the 2nd pin of the attenuator R33; the 3rd pin of the attenuator R33 is grounded, the 1st pin of the attenuator R33 is connected to the 2nd pin of the attenuator R34, the 3rd pin of the attenuator R34 is grounded, and the 1st pin of the attenuator R34 is connected to the 10th pin (RF output pin) of the oscillator U11; the model of the oscillator U11 is HMC736LP4; the models of the attenuators R33 and R34 are both PAT0510S-C-3DB-T10;

[0013] Pin 3 of the sampling phase detector to D3 is connected to one end of resistor R29 and is connected to the lock detection circuit as a V1 port; Pin 5 of the sampling phase detector to D3 is connected to the other end of resistor R29 and is connected to the lock detection circuit as a V2 port.

[0014] As a preferred technical solution, the lock detection circuit includes a comparator Q1, a comparator Q2, an operational amplifier A2, and an operational amplifier A3; the models of the comparator Q1 and the comparator Q2 are both TPS3701DDCR; the models of the operational amplifier A2 and the operational amplifier A3 are both THS4032;

[0015] Pin 1 of operational amplifier A2 is connected to pin 2 and one end of resistor R40; pin 3 of operational amplifier A2 is connected to port V1 of phase detection circuit; pin 4 of operational amplifier A2 is grounded; pin 5 of operational amplifier A2 is connected to port V2 of phase detection circuit; pin 6 of operational amplifier A2 is connected to pin 7 and one end of resistor R47; the other end of resistor R47 is connected to one end of sliding rheostat R44, and the other end of sliding rheostat R44 is connected to the other end of resistor R40; the sliding end of sliding rheostat is connected to pin 2 of operational amplifier A3, one end of resistor R42, and one end of resistor R39;

[0016] Pin 8 of operational amplifier A2 is connected to one end of capacitor C58, one end of capacitor C59, one end of resistor R49, and one end of resistor R37; the other end of capacitor C58 is connected to the other end of capacitor C59 and grounded;

[0017] The other end of the resistor R49 is connected to one end of the resistor R51, one end of the capacitor C61, one end of the resistor R53, one end of the capacitor C68, one end of the capacitor C72, one end of the capacitor C69, one end of the capacitor C74 and connected to the VC end of the phase detection circuit; the other end of the capacitor C68 is connected to the other end of the capacitor C72, the other end of the capacitor C69, the other end of the capacitor C74 and grounded; the other end of the resistor R51 and the other end of the capacitor C61 are grounded; the other end of the resistor R53 is connected to one end of the capacitor C70, one end of the resistor R54, and the 3rd pin of the operational amplifier A3;

[0018] The other end of the resistor R37 is connected to one end of the capacitor C55, one end of the capacitor C56, and the 7th pin of the operational amplifier A3 and connected to the common terminal 9V1; the other end of the capacitor C55 and the other end of the capacitor C56 are grounded; the 4th pin of the operational amplifier A3 is grounded; the 6th pin of the operational amplifier A3 is connected to one end of the capacitor C62, one end of the capacitor C57, and the other end of the resistor R39 and serves as a VT port; the other end of the capacitor C62 is connected to the other end of the resistor R54; the other end of the capacitor C57 is connected to the other end of the resistor R42;

[0019] Pin 1 of comparator Q1 is connected to one end of resistor R41, pin 6 of comparator Q1 and connected to the common terminal OUT1; pin 2 of comparator Q1 is grounded; pin 3 of comparator Q1 is connected to one end of resistor R46 and one end of resistor R55; the other end of resistor R46 is connected to VT port and one end of capacitor C80; pin 4 of comparator Q1 is connected to the other end of resistor R55 and one end of resistor R57; the other end of resistor R57 is grounded; pin 5 of comparator Q1 is connected to the other end of resistor R41, one end of capacitor C60, one end of resistor R58, pin 5 of comparator Q2 and the common terminal 5V1; the other end of capacitor C60 is grounded;

[0020] Pin 1 of comparator Q2 is connected to pin 6, the other end of resistor R58, and one end of resistor R59; the other end of resistor R59 is used as LDout port for external output;

[0021] Pin 2 of comparator Q2 is grounded; pin 3 of comparator Q2 is connected to the common terminal OUT1; pin 4 of comparator Q2 is connected to one end of resistor R64, one end of capacitor C81, and one end of resistor R62; the other end of resistor R64 is connected to the other end of capacitor C81 and grounded; the other end of resistor R62 is connected to the other end of capacitor C80 and the cathode of diode D4; the anode of diode D4 is grounded.

[0022] As a preferred technical solution, the preset voltage circuit includes an analog switch chip A4 and an analog switch chip A6, and the models of the analog switch chip A4 and the analog switch chip A6 are AD1633; the pin 1 of the analog switch chip A4 is connected to one end of the resistor R52, the pin 2 of the analog switch chip A4 is connected to the pin 3 and grounded; the pin 4 of the analog switch chip A4 is connected to one end of the resistor R45; the pins 5, 6 and 13 of the analog switch chip A4 are respectively connected to the pins 12, 13 and 11 of the microcontroller U2; the model of the microcontroller U2 is C8051F330; the pin 8 of the analog switch chip A4 is connected to the pin 5 of the analog switch chip A4, the pin 16 of the analog switch chip A4, the pin 5 of the analog switch chip A6, the pin 8 of the analog switch chip A6, and the pin 16 of the analog switch chip A6; the pin 1 of the analog switch chip A4 Pin 9 is connected to one end of resistor R38, and the other end of resistor R38 is connected to one end of resistor R36 and one end of resistor R43; the other end of resistor R36 is grounded; the other end of resistor R43 is connected to the other end of resistor R45 and one end of resistor R48; the other end of resistor R48 is connected to the other end of resistor R52 and one end of resistor R60; pin 10 of analog switch chip A4 is connected to pin 11 of analog switch chip A4, one end of resistor R50 and grounded; the other end of resistor R50 is connected to pin 12 of analog switch chip A4; pin 14 of analog switch chip A4 is grounded; pin 15 of analog switch chip A4 is connected to one end of capacitor C71, one end of capacitor C73, one end of capacitor C77 and connected to the common terminal 9V1; the other end of capacitor C71, the other end of capacitor C73 and the other end of capacitor C77 are grounded;

[0023] Pin 1 of analog switch chip A6 is connected to one end of resistor R70, and pin 2 of analog switch chip A6 is connected to pin 3 and grounded; pin 4 of analog switch chip A6 is connected to one end of resistor R66; pins 6, 7, and 13 of analog switch chip A6 are connected to pins 9, 10, and 8 respectively; pin 9 of analog switch chip A6 is connected to one end of resistor R63; pin 10 of analog switch chip A6 is connected to pin 11 and one end of resistor R69 and grounded; pin 12 of analog switch chip A6 is connected to the other end of resistor R69; pin 14 of analog switch chip A6 is grounded; pin 16 of analog switch chip A6 is connected to one end of capacitor C84, one end of capacitor C85, and one end of capacitor C86 and connected to the common terminal 9V1; the other end of capacitor C84, the other end of capacitor C85, and the other end of capacitor C86 are grounded;

[0024] The other end of the resistor R45 is connected to one end of the resistor R48 and one end of the resistor R43; the other end of the resistor R43 is connected to the other end of the resistor R38 and one end of the resistor R36, and the other end of the resistor R36 is grounded; the other end of the resistor R48 is connected to the other end of the resistor R52 and one end of the resistor R60; the other end of the resistor R60 is connected to one end of the resistor R63 and one end of the resistor R65; the other end of the resistor R65 is connected to the other end of the resistor R66 and one end of the resistor R68; the other end of the resistor R68 is connected to the other end of the resistor R70 as the output end of the preset voltage circuit and connected to one end of the resistor R71;

[0025] The other end of the resistor R71 is connected to the 3rd pin of the diode D6; the 1st pin of the diode D6 is connected to the 2nd pin of the diode D6, the 1st pin of the diode D5, the 2nd pin of the diode D5 and one end of the resistor R67; the model of the diode D5 and the diode D6 is BAW156T; the diode D5 and the diode D6 constitute the switch circuit;

[0026] The other end of the resistor R67 is connected to the pin 22 of the oscillator U11 and one end of the capacitor C83; the other end of the capacitor C83 is grounded.

[0027] As a preferred technical solution, the model of the oscillator U11 is HMC736LP4;

[0028] Pin 20 of the oscillator U11 is connected to one end of the capacitor C82, one end of the capacitor C79, one end of the capacitor C78, ​​and pin 3 of the power filter U10. Pins 2 and 4 of the power filter U10 are grounded; pin 1 of the power filter U10 is connected to the +9V common terminal;

[0029] Pin 16 of oscillator U11 is connected to one end of capacitor C75, and the other end of capacitor C75 is connected to pin 2 of RF amplifier A5; pin 8 of RF amplifier A5 is connected to one end of inductor L12 and one end of capacitor C76; the other end of inductor L12 is connected to one end of capacitor C66, one end of capacitor C67, and one end of resistor R56; the other end of capacitor C66 and the other end of capacitor C67 are grounded; the other end of resistor R56 is connected to one end of capacitor C65, one end of capacitor C63, and one end of capacitor C64 and connected to the common terminal 9V1; the other end of capacitor C65 is connected to the other end of capacitor C63, the other end of capacitor C64 and grounded; the other end of capacitor C76 serves as the RF signal output terminal RFout; pin 10 of oscillator U11 is connected to pin 1 of attenuator R34 in the above-mentioned phase-locking circuit.

[0030] As an optimal technical solution, the operational amplifier circuit includes an operational amplifier A1; the model of the operational amplifier A1 is OPA172; the 3rd pin of the diode D5 is connected to one end of the resistor R24, and the other end of the resistor R24 ​​is connected to one end of the resistor R21 and one end of the capacitor C35; the other end of the capacitor C35 is grounded; the other end of the resistor R21 is connected to one end of the resistor R14 and the 1st pin of the operational amplifier A1; the pin of the operational amplifier A1 is grounded; the 3rd pin of the operational amplifier A1 is connected to one end of the resistor R4; the other end of the resistor R4 is connected to the 1st pin of the single-chip computer U2, one end of the capacitor C9, and one end of the resistor R3; the other end of the capacitor C9 is connected to the other end of the resistor R3 and grounded; the 4th pin of the operational amplifier A1 is connected to one end of the resistor R8 and the other end of the resistor R14; the other end of the resistor R8 is grounded; the 5th pin of the operational amplifier A1 is connected to one end of the capacitor C11 and the common end 9V1; the other end of the capacitor C11 is grounded.

[0031] Compared with the prior art, the utility model has the following beneficial effects:

[0032] In the utility model, the single chip microcomputer, the phase detection circuit, the locking detection circuit, the preset voltage circuit, the power supply circuit and the oscillator are respectively single chip microcomputers, the phase detection circuit, the locking detection circuit, the preset voltage circuit, the power supply circuit and the oscillator which adopt the patch mounting technology, so that the overall structure is compact, the volume is small and the weight is light.

[0033] The circuit structure of the utility model is simple, so the cost is low.

[0034] In the utility model, the preset voltage circuit adopts an analog integration circuit, which will not introduce other noises. The traditional use of a DAC circuit to achieve preset will introduce noise through the output line of the DAC, which will affect the module phase noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is the circuit schematic diagram of the single chip microcomputer;

[0036] Figure 2 The schematic diagram of the power supply circuit is shown in FIG.

[0037] Figure 3 This is the circuit schematic diagram of the phase detection circuit;

[0038] Figure 4 is a circuit schematic diagram of a lock detection circuit;

[0039] Figure 5 This is the circuit schematic diagram of the oscillator;

[0040] Figure 6 is the circuit schematic diagram of the operational amplifier circuit;

[0041] Figure 7 This is the circuit schematic diagram of the preset voltage circuit. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0043] On the contrary, the present application covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present application as defined by the claims. Further, in order to make the public have a better understanding of the present application, some specific details are described in detail in the detailed description of the present application below. Those skilled in the art can fully understand the present application without the description of these details.

[0044] Example

[0045] like Figure 1 As shown, a surface-mounted sampling phase-locked oscillator (PVCO) includes a single-chip microcomputer, a phase detection circuit, a lock detection circuit, a preset voltage circuit, a power supply circuit, and an oscillator.

[0046] The power supply circuit is connected with the single chip microcomputer, the phase detection circuit, the lock detection circuit, the preset voltage circuit and the oscillator.

[0047] The single chip microcomputer is connected with a preset voltage circuit. The preset voltage circuit adopts an analog integration circuit and will not introduce other noise. The traditional use of a DAC circuit to achieve preset will introduce noise through the output line of the DAC, which will affect the module phase noise. The preset voltage is added to the input end of the operational amplifier circuit, and the operational amplifier plays an isolation role. The output ends of the preset voltage circuit and the operational amplifier circuit are connected to the input end of the oscillator through a switch circuit formed by a diode, thereby determining whether the input voltage of the oscillator comes from the preset circuit or the operational amplifier circuit;

[0048] The oscillator has two output ends. The VCO output frequency division end is fed back to the input end of the phase detection circuit, and the other output end outputs the RF signal through the RF amplifier. The two input ends of the phase detection circuit respectively input the reference signal and the sampled oscillator signal, and after phase detection, they are output to the lock detection circuit. The lock detection circuit outputs positive feedback after locking judgment on the signal.

[0049] In this embodiment, the initial phase is set and the output frequency is dynamically adjusted by setting a preset voltage, so that the overall debugging is convenient.

[0050] The main components of the single chip microcomputer, phase detection circuit, lock detection circuit, preset voltage circuit, power supply circuit and oscillator in this embodiment are all installed by using the surface mount technology, so that the overall size is small and the weight is light.

[0051] like Figure 1As shown, the single-chip microcomputer U2 and its basic circuit, wherein the model of the single-chip microcomputer U2 is C8051F330; the single-chip microcomputer is connected to a reset chip U4, and the model of the reset chip U4 is MAX809.

[0052] like Figure 2 As shown in the figure, it is the circuit schematic diagram of the power supply circuit, which inputs a 12V voltage, provides a +9V common terminal, a +5V-PLL1 common terminal, and a +3.3V_MCU common terminal, and outputs multiple voltages by stabilizing and stepping down the voltage.

[0053] like Figure 3 As shown, the phase detection circuit includes a transformer U8, the model of the transformer U8 is TC4-1W, and the pin 1 of the transformer U8 is connected to one end of the capacitor C53, one end of the capacitor C46, ​​and one end of the inductor L10; the other end of the capacitor C46 is connected to one end of the capacitor C45, the other end of the inductor L10, one end of the capacitor C52, and one end of the inductor L11; the other end of the capacitor C45 is connected to the other end of the inductor L11, one end of the capacitor C51, and one end of the capacitor C48; the other end of the capacitor C48 is connected to the inductor L8 The emitter of transistor U9 is connected to one end of resistor R35, and the other end of resistor R35 is grounded; the base of transistor U9 is connected to one end of capacitor C50, one end of resistor R27, and one end of capacitor C54; the other end of capacitor C50 is connected to the other end of resistor R30; the other end of capacitor C54 is connected to pin 2 of attenuator R31; the reference voltage is input to pin 1 of attenuator R31, and pin 3 of attenuator R31 is grounded; the type of attenuator R31 The number is PAT0510S-C-3DB-T10; the other end of resistor R27 is connected to one end of capacitor C29, one end of capacitor C38, and pin 2 of active bias controller U7; the other end of capacitor C38 is connected to the other end of capacitor C39 and grounded; pin 1 of active bias controller U7 is grounded, and pin 3 of active bias controller U7 is connected to one end of capacitor C43, one end of capacitor C41, one end of capacitor C42, one end of resistor R25, and one end of inductor L7; the other end of capacitor C43 is connected to The other end of capacitor C41 and the other end of capacitor C42 are connected to ground; the other end of inductor L7 is connected to pin 3 of filter U6; pins 2 and 4 of filter U6 are grounded; pin 1 of filter U6 is connected to the +9V common terminal; the model of filter U6 is NFM21HC471R1H3; pin 4 of active bias controller U7 is connected to one end of capacitor C36, the other end of resistor R25, one end of capacitor C37, and the other end of inductor L8; the other end of capacitor C36 and the other end of capacitor C37 are grounded.

[0054] Pin 6 of transformer U8 is connected to one end of capacitor C49, and the other end of capacitor C49 is connected to one end of resistor R32, one end of capacitor C44, and pin 1 of sampling phase detector to D3; the model of sampling phase detector to D3 is MSPD2018; pin 2 of sampling phase detector to D3 is connected to the other end of capacitor C44, one end of resistor R26, and one end of capacitor C40, and the other end of capacitor C40 is connected to pin 4 of transformer U8; the other ends of resistor R32 and resistor R26 are grounded;

[0055] The sampling phase detector to the 4th pin of D3 is connected to one end of the resistor R28 and one end of the capacitor C47; the other end of the resistor R28 is the VC port connected to the lock detection circuit; the other end of the capacitor C47 is connected to the 2nd pin of the attenuator R33; the 3rd pin of the attenuator R33 is grounded, the 1st pin of the attenuator R33 is connected to the 2nd pin of the attenuator R34, the 3rd pin of the attenuator R34 is grounded, and the 1st pin of the attenuator R34 is connected to the 10th pin (RF output pin) of the oscillator U11; the model of the oscillator U11 is HMC736LP4; the models of the attenuators R33 and R34 are both PAT0510S-C-3DB-T10;

[0056] Pin 3 of the sampling phase detector to D3 is connected to one end of resistor R29 and is connected to the lock detection circuit as a V1 port; Pin 5 of the sampling phase detector to D3 is connected to the other end of resistor R29 and is connected to the lock detection circuit as a V2 port.

[0057] The lock detection circuit includes a comparator Q1, a comparator Q2, an operational amplifier A2, and an operational amplifier A3; the models of the comparator Q1 and the comparator Q2 are both TPS3701DDCR; the models of the operational amplifier A2 and the operational amplifier A3 are both THS4032.

[0058] Pin 1 of operational amplifier A2 is connected to pin 2 and one end of resistor R40; pin 3 of operational amplifier A2 is connected to port V1 of phase detection circuit; pin 4 of operational amplifier A2 is grounded; pin 5 of operational amplifier A2 is connected to port V2 of phase detection circuit; pin 6 of operational amplifier A2 is connected to pin 7 and one end of resistor R47; the other end of resistor R47 is connected to one end of sliding rheostat R44, and the other end of sliding rheostat R44 is connected to the other end of resistor R40; the sliding end of sliding rheostat is connected to pin 2 of operational amplifier A3, one end of resistor R42, and one end of resistor R39;

[0059] Pin 8 of operational amplifier A2 is connected to one end of capacitor C58, one end of capacitor C59, one end of resistor R49, and one end of resistor R37; the other end of capacitor C58 is connected to the other end of capacitor C59 and grounded;

[0060] The other end of the resistor R49 is connected to one end of the resistor R51, one end of the capacitor C61, one end of the resistor R53, one end of the capacitor C68, one end of the capacitor C72, one end of the capacitor C69, one end of the capacitor C74 and connected to the VC end of the phase detection circuit; the other end of the capacitor C68 is connected to the other end of the capacitor C72, the other end of the capacitor C69, the other end of the capacitor C74 and grounded; the other end of the resistor R51 and the other end of the capacitor C61 are grounded; the other end of the resistor R53 is connected to one end of the capacitor C70, one end of the resistor R54, and the 3rd pin of the operational amplifier A3;

[0061] The other end of the resistor R37 is connected to one end of the capacitor C55, one end of the capacitor C56, and the 7th pin of the operational amplifier A3 and connected to the common terminal 9V1; the other end of the capacitor C55 and the other end of the capacitor C56 are grounded; the 4th pin of the operational amplifier A3 is grounded; the 6th pin of the operational amplifier A3 is connected to one end of the capacitor C62, one end of the capacitor C57, and the other end of the resistor R39 and serves as a VT port; the other end of the capacitor C62 is connected to the other end of the resistor R54; the other end of the capacitor C57 is connected to the other end of the resistor R42;

[0062] Pin 1 of comparator Q1 is connected to one end of resistor R41, pin 6 of comparator Q1 and connected to the common terminal OUT1; pin 2 of comparator Q1 is grounded; pin 3 of comparator Q1 is connected to one end of resistor R46 and one end of resistor R55; the other end of resistor R46 is connected to the VT port and one end of capacitor C80; pin 4 of comparator Q1 is connected to the other end of resistor R55 and one end of resistor R57; the other end of resistor R57 is grounded; pin 5 of comparator Q1 is connected to the other end of resistor R41, one end of capacitor C60, one end of resistor R58, pin 5 of comparator Q2, and the common terminal 5V1; the other end of capacitor C60 is grounded; the common terminal 5V1 is connected to the common terminal +5V-PLL1.

[0063] Pin 1 of comparator Q2 is connected to pin 6, the other end of resistor R58, and one end of resistor R59; the other end of resistor R59 is used as LDout port for external output;

[0064] Pin 2 of the comparator Q2 is grounded; Pin 3 of the comparator Q2 is connected to the common terminal OUT1; Pin 4 of the comparator Q2 is connected to one end of the resistor R64, one end of the capacitor C81, and one end of the resistor R62; the other end of the resistor R64 is connected to the other end of the capacitor C81 and grounded; the other end of the resistor R62 is connected to the other end of the capacitor C80 and the cathode of the diode D4. The anode of the diode D4 is grounded.

[0065] The preset voltage circuit includes an analog switch chip A4 and an analog switch chip A6, and the models of the analog switch chip A4 and the analog switch chip A6 are AD1633; the pin 1 of the analog switch chip A4 is connected to one end of the resistor R52, the pin 2 of the analog switch chip A4 is connected to the pin 3 and grounded; the pin 4 of the analog switch chip A4 is connected to one end of the resistor R45; the pins 5, 6 and 13 of the analog switch chip A4 are respectively connected to the pins 12, 13 and 11 of the microcontroller U2; the model of the microcontroller U2 is C8051F330; the pin 8 of the analog switch chip A4 is connected to the pin 5 of the analog switch chip A4, the pin 16 of the analog switch chip A4, the pin 5 of the analog switch chip A6, the pin 8 of the analog switch chip A6, and the pin 16 of the analog switch chip A6; the pin 9 of the analog switch chip A4 is connected to the resistor One end of R38 and the other end of resistor R38 are connected to one end of resistor R36 and one end of resistor R43; the other end of resistor R36 is grounded; the other end of resistor R43 is connected to the other end of resistor R45 and one end of resistor R48; the other end of resistor R48 is connected to the other end of resistor R52 and one end of resistor R60; pin 10 of analog switch chip A4 is connected to pin 11 of analog switch chip A4, one end of resistor R50 and grounded; the other end of resistor R50 is connected to pin 12 of analog switch chip A4; pin 14 of analog switch chip A4 is grounded; pin 15 of analog switch chip A4 is connected to one end of capacitor C71, one end of capacitor C73, one end of capacitor C77 and connected to the common terminal 9V1; the other end of capacitor C71, the other end of capacitor C73 and the other end of capacitor C77 are grounded;

[0066] Pin 1 of analog switch chip A6 is connected to one end of resistor R70, and pin 2 of analog switch chip A6 is connected to pin 3 and grounded; pin 4 of analog switch chip A6 is connected to one end of resistor R66; pins 6, 7, and 13 of analog switch chip A6 are connected to pins 9, 10, and 8 respectively; pin 9 of analog switch chip A6 is connected to one end of resistor R63; pin 10 of analog switch chip A6 is connected to pin 11 and one end of resistor R69 and grounded; pin 12 of analog switch chip A6 is connected to the other end of resistor R69; pin 14 of analog switch chip A6 is grounded; pin 16 of analog switch chip A6 is connected to one end of capacitor C84, one end of capacitor C85, and one end of capacitor C86 and connected to the common terminal 9V1; the other end of capacitor C84, the other end of capacitor C85, and the other end of capacitor C86 are grounded;

[0067] The other end of resistor R45 is connected to one end of resistor R48 and one end of resistor R43; the other end of resistor R43 is connected to the other end of resistor R38 and one end of resistor R36, and the other end of resistor R36 is grounded; the other end of resistor R48 is connected to the other end of resistor R52 and one end of resistor R60; the other end of resistor R60 is connected to one end of resistor R63 and one end of resistor R65; the other end of resistor R65 is connected to the other end of resistor R66 and one end of resistor R68; the other end of resistor R68 is connected to the other end of resistor R70 as the output end of the preset voltage circuit and connected to one end of resistor R71.

[0068] The other end of the resistor R71 is connected to the 3rd pin of the diode D6; the 1st pin of the diode D6 is connected to the 2nd pin of the diode D6, the 1st pin of the diode D5, the 2nd pin of the diode D5 and one end of the resistor R67; the model of the diode D5 and the diode D6 is BAW156T; the diode D5 and the diode D6 constitute the switching circuit.

[0069] The other end of the resistor R67 is connected to the 22nd pin of the oscillator U11 and one end of the capacitor C83; the other end of the capacitor C83 is grounded; the model of the oscillator U11 is HMC736LP4;

[0070] Pin 20 of the oscillator U11 is connected to one end of the capacitor C82, one end of the capacitor C79, one end of the capacitor C78, ​​and pin 3 of the power filter U10. Pins 2 and 4 of the power filter U10 are grounded; pin 1 of the power filter U10 is connected to the +9V common terminal;

[0071] Pin 16 of the oscillator U11 is connected to one end of the capacitor C75, and the other end of the capacitor C75 is connected to pin 2 of the RF amplifier A5; pin 8 of the RF amplifier A5 is connected to one end of the inductor L12 and one end of the capacitor C76; the other end of the inductor L12 is connected to one end of the capacitor C66, one end of the capacitor C67, and one end of the resistor R56; the other end of the capacitor C66 and the other end of the capacitor C67 are grounded; the other end of the resistor R56 is connected to one end of the capacitor C65, one end of the capacitor C63, and one end of the capacitor C64 and connected to the common terminal 9V1; the other end of the capacitor C65 is connected to the other end of the capacitor C63, the other end of the capacitor C64 and grounded; the other end of the capacitor C76 serves as the RF signal output terminal RFout; pin 10 of the oscillator U11 is connected to pin 1 of the attenuator R34 in the above-mentioned phase-locking circuit;

[0072] Among them, the model of RF amplifier A5 is PMA3-83LN+GND;

[0073] The operational amplifier circuit includes an operational amplifier A1; the model of the operational amplifier A1 is OPA172; the 3rd pin of the diode D5 is connected to one end of the resistor R24, the other end of the resistor R24 ​​is connected to one end of the resistor R21 and one end of the capacitor C35; the other end of the capacitor C35 is grounded; the other end of the resistor R21 is connected to one end of the resistor R14 and the 1st pin of the operational amplifier A1; the pin of the operational amplifier A1 is grounded; the 3rd pin of the operational amplifier A1 is connected to one end of the resistor R4; the other end of the resistor R4 is connected to the 1st pin of the single-chip computer U2, one end of the capacitor C9, and one end of the resistor R3; the other end of the capacitor C9 is connected to the other end of the resistor R3 and grounded; the 4th pin of the operational amplifier A1 is connected to one end of the resistor R8 and the other end of the resistor R14; the other end of the resistor R8 is grounded; the 5th pin of the operational amplifier A1 is connected to one end of the capacitor C11 and the common terminal 9V1; the other end of the capacitor C11 is grounded.

[0074] In this embodiment, the overall circuit structure is simple, so the cost is relatively low, and the electronic components used are mostly surface-mount electronic components, so that the overall structure is compact, small in size, and light in weight.

[0075] It is worth noting that, based on the above structural design, in order to solve the same technical problem, even if some insubstantial improvements are made on the present invention, they also fall within the protection scope of the present invention.

Claims

1. A surface mount sampling phase locked oscillator, characterized in that: It includes a single chip microcomputer, a phase detection circuit, a lock detection circuit, a preset voltage circuit, a power supply circuit, and an oscillator; the power supply circuit is connected to the single chip microcomputer, the phase detection circuit, the lock detection circuit, the preset voltage circuit, and the oscillator; The single-chip microcomputer is connected to the input end of the preset voltage circuit and the operational amplifier circuit, and the output end of the preset voltage circuit and the operational amplifier circuit is connected to the input end of the oscillator through a switch circuit formed by a diode; the oscillator has two output ends, one of which is connected to the input end of the phase detection circuit, and the other output end outputs the radio frequency signal through the radio frequency amplifier; the two input ends of the phase detection circuit respectively input the reference signal and the sampled oscillator signal, and output them to the lock detection circuit after phase detection, and the lock detection circuit outputs positive feedback after locking judgment on the signal; The preset voltage circuit adopts a preset voltage circuit of an analog integral circuit structure, and the preset voltage circuit outputs a preset voltage which is added to the input end of the operational amplifier circuit; The single-chip microcomputer, phase-detection circuit, locking detection circuit, preset voltage circuit, power supply circuit and oscillator are respectively a single-chip microcomputer, phase-detection circuit, locking detection circuit, preset voltage circuit, power supply circuit and oscillator which adopt the surface mount mounting technology.

2. A surface mount sampling phase locked oscillator according to claim 1, characterized in that: The phase detection circuit includes a transformer U8, the model of the transformer U8 is TC4-1W, and the pin 1 of the transformer U8 is connected to one end of the capacitor C53, one end of the capacitor C46, ​​and one end of the inductor L10; the other end of the capacitor C46 is connected to one end of the capacitor C45, the other end of the inductor L10, one end of the capacitor C52, and one end of the inductor L11; the other end of the capacitor C45 is connected to the other end of the inductor L11, one end of the capacitor C51, and one end of the capacitor C48; the other end of the capacitor C48 is connected to one end of the inductor L8. The emitter of transistor U9 is connected to one end of resistor R35, and the other end of resistor R35 is grounded; the base of transistor U9 is connected to one end of capacitor C50, one end of resistor R27, and one end of capacitor C54; the other end of capacitor C50 is connected to the other end of resistor R30; the other end of capacitor C54 is connected to pin 2 of attenuator R31; pin 1 of attenuator R31 inputs reference voltage, and pin 3 of attenuator R31 is grounded; the model of attenuator R31 is PAT0510S-C-3DB-T10; the other end of resistor R27 is connected to one end of capacitor C29, one end of capacitor C38, and pin 2 of active bias controller U7; the other end of capacitor C38 is connected to the other end of capacitor C39 and grounded; pin 1 of active bias controller U7 is grounded, and pin 3 of active bias controller U7 is connected to one end of capacitor C43, one end of capacitor C41, one end of capacitor C42, one end of resistor R25, and one end of inductor L7; the other end of capacitor C43 is connected The other end of capacitor C41 and the other end of capacitor C42 are grounded; the other end of inductor L7 is connected to pin 3 of filter U6; pins 2 and 4 of filter U6 are grounded; pin 1 of filter U6 is connected to the +9V common terminal; the model of filter U6 is NFM21HC471R1H3; pin 4 of active bias controller U7 is connected to one end of capacitor C36, the other end of resistor R25, one end of capacitor C37, and the other end of inductor L8; the other end of capacitor C36 and the other end of capacitor C37 are grounded; Pin 6 of transformer U8 is connected to one end of capacitor C49, and the other end of capacitor C49 is connected to one end of resistor R32, one end of capacitor C44, and pin 1 of sampling phase detector to D3; the model of sampling phase detector to D3 is MSPD2018; pin 2 of sampling phase detector to D3 is connected to the other end of capacitor C44, one end of resistor R26, and one end of capacitor C40, and the other end of capacitor C40 is connected to pin 4 of transformer U8; the other ends of resistor R32 and resistor R26 are grounded; The sampling phase detector to the 4th pin of D3 is connected to one end of the resistor R28 and one end of the capacitor C47; the other end of the resistor R28 is the VC port connected to the lock detection circuit; the other end of the capacitor C47 is connected to the 2nd pin of the attenuator R33; the 3rd pin of the attenuator R33 is grounded, the 1st pin of the attenuator R33 is connected to the 2nd pin of the attenuator R34, the 3rd pin of the attenuator R34 is grounded, and the 1st pin of the attenuator R34 is connected to the 10th pin of the oscillator U11; the model of the oscillator U11 is HMC736LP4; the models of the attenuators R33 and R34 are both PAT0510S-C-3DB-T10; Pin 3 of the sampling phase detector to D3 is connected to one end of resistor R29 and is connected to the lock detection circuit as a V1 port; Pin 5 of the sampling phase detector to D3 is connected to the other end of resistor R29 and is connected to the lock detection circuit as a V2 port.

3. A surface mount sampling phase locked oscillator according to claim 2, characterized in that: The lock detection circuit includes a comparator Q1, a comparator Q2, an operational amplifier A2, and an operational amplifier A3; the models of the comparator Q1 and the comparator Q2 are both TPS3701DDCR; the models of the operational amplifier A2 and the operational amplifier A3 are both THS4032; Pin 1 of operational amplifier A2 is connected to pin 2 and one end of resistor R40; pin 3 of operational amplifier A2 is connected to port V1 of phase detection circuit; pin 4 of operational amplifier A2 is grounded; pin 5 of operational amplifier A2 is connected to port V2 of phase detection circuit; pin 6 of operational amplifier A2 is connected to pin 7 and one end of resistor R47; the other end of resistor R47 is connected to one end of sliding rheostat R44, and the other end of sliding rheostat R44 is connected to the other end of resistor R40; the sliding end of sliding rheostat is connected to pin 2 of operational amplifier A3, one end of resistor R42, and one end of resistor R39; Pin 8 of operational amplifier A2 is connected to one end of capacitor C58, one end of capacitor C59, one end of resistor R49, and one end of resistor R37; the other end of capacitor C58 is connected to the other end of capacitor C59 and grounded; The other end of the resistor R49 is connected to one end of the resistor R51, one end of the capacitor C61, one end of the resistor R53, one end of the capacitor C68, one end of the capacitor C72, one end of the capacitor C69, one end of the capacitor C74 and connected to the VC end of the phase detection circuit; the other end of the capacitor C68 is connected to the other end of the capacitor C72, the other end of the capacitor C69, the other end of the capacitor C74 and grounded; the other end of the resistor R51 and the other end of the capacitor C61 are grounded; the other end of the resistor R53 is connected to one end of the capacitor C70, one end of the resistor R54, and the 3rd pin of the operational amplifier A3; The other end of the resistor R37 is connected to one end of the capacitor C55, one end of the capacitor C56, and the 7th pin of the operational amplifier A3 and connected to the common terminal 9V1; the other end of the capacitor C55 and the other end of the capacitor C56 are grounded; the 4th pin of the operational amplifier A3 is grounded; the 6th pin of the operational amplifier A3 is connected to one end of the capacitor C62, one end of the capacitor C57, and the other end of the resistor R39 and serves as a VT port; the other end of the capacitor C62 is connected to the other end of the resistor R54; the other end of the capacitor C57 is connected to the other end of the resistor R42; Pin 1 of comparator Q1 is connected to one end of resistor R41, pin 6 of comparator Q1 and connected to the common terminal OUT1; pin 2 of comparator Q1 is grounded; pin 3 of comparator Q1 is connected to one end of resistor R46 and one end of resistor R55; the other end of resistor R46 is connected to VT port and one end of capacitor C80; pin 4 of comparator Q1 is connected to the other end of resistor R55 and one end of resistor R57; the other end of resistor R57 is grounded; pin 5 of comparator Q1 is connected to the other end of resistor R41, one end of capacitor C60, one end of resistor R58, pin 5 of comparator Q2 and the common terminal 5V1; the other end of capacitor C60 is grounded; Pin 1 of comparator Q2 is connected to pin 6, the other end of resistor R58, and one end of resistor R59; the other end of resistor R59 is used as LDout port for external output; Pin 2 of comparator Q2 is grounded; pin 3 of comparator Q2 is connected to the common terminal OUT1; pin 4 of comparator Q2 is connected to one end of resistor R64, one end of capacitor C81, and one end of resistor R62; the other end of resistor R64 is connected to the other end of capacitor C81 and grounded; the other end of resistor R62 is connected to the other end of capacitor C80 and the cathode of diode D4; the anode of diode D4 is grounded.

4. A surface mount sampling phase locked oscillator according to claim 1, characterized in that: The preset voltage circuit includes an analog switch chip A4 and an analog switch chip A6, and the models of the analog switch chip A4 and the analog switch chip A6 are AD1633; the pin 1 of the analog switch chip A4 is connected to one end of the resistor R52, the pin 2 of the analog switch chip A4 is connected to the pin 3 and grounded; the pin 4 of the analog switch chip A4 is connected to one end of the resistor R45; Pins 5, 6, and 13 of the analog switch chip A4 are connected to pins 12, 13, and 11 of the microcontroller U2 respectively; The model of the microcontroller U2 is C8051F330; the 8th pin of the analog switch chip A4 is connected to the 5th pin of the analog switch chip A4, the 16th pin of the analog switch chip A4, the 5th pin of the analog switch chip A6, the 8th pin of the analog switch chip A6, and the 16th pin of the analog switch chip A6; Pin 9 of analog switch chip A4 is connected to one end of resistor R38, and the other end of resistor R38 is connected to one end of resistor R36 and one end of resistor R43; the other end of resistor R36 is grounded; the other end of resistor R43 is connected to the other end of resistor R45 and one end of resistor R48; the other end of resistor R48 is connected to the other end of resistor R52 and one end of resistor R60; pin 10 of analog switch chip A4 is connected to pin 11 of analog switch chip A4, one end of resistor R50 and grounded; The other end of the resistor R50 is connected to the 12th pin of the analog switch chip A4; the 14th pin of the analog switch chip A4 is grounded; Pin 15 of analog switch chip A4 is connected to one end of capacitor C71, one end of capacitor C73, one end of capacitor C77 and connected to common terminal 9V1; the other end of capacitor C71, the other end of capacitor C73 and the other end of capacitor C77 are grounded; Pin 1 of the analog switch chip A6 is connected to one end of the resistor R70, and pin 2 of the analog switch chip A6 is connected to pin 3 and grounded; pin 4 of the analog switch chip A6 is connected to one end of the resistor R66; Pin 6, Pin 7, and Pin 13 of analog switch chip A6 are connected to Pin 9, Pin 10, and Pin 8 respectively; Pin 9 of analog switch chip A6 is connected to one end of resistor R63; Pin 10 of analog switch chip A6 is connected to Pin 11, one end of resistor R69 and grounded; Pin 12 of analog switch chip A6 is connected to the other end of resistor R69; Pin 14 of analog switch chip A6 is grounded; Pin 16 of the analog switch chip A6 is connected to one end of the capacitor C84, one end of the capacitor C85, one end of the capacitor C86 and connected to the common terminal 9V1; the other end of the capacitor C84, the other end of the capacitor C85, and the other end of the capacitor C86 are grounded; The other end of the resistor R45 is connected to one end of the resistor R48 and one end of the resistor R43; the other end of the resistor R43 is connected to the other end of the resistor R38 and one end of the resistor R36, and the other end of the resistor R36 is grounded; the other end of the resistor R48 is connected to the other end of the resistor R52 and one end of the resistor R60; the other end of the resistor R60 is connected to one end of the resistor R63 and one end of the resistor R65; the other end of the resistor R65 is connected to the other end of the resistor R66 and one end of the resistor R68; the other end of the resistor R68 is connected to the other end of the resistor R70 as the output end of the preset voltage circuit and connected to one end of the resistor R71; The other end of the resistor R71 is connected to the pin 3 of the diode D6; the pin 1 of the diode D6 is connected to the pin 2 of the diode D6, the pin 1 of the diode D5, the pin 2 of the diode D5 and one end of the resistor R67; The diode D5 and the diode D6 are of the BAW156T type; The diode D5 and the diode D6 constitute the switch circuit; The other end of the resistor R67 is connected to the pin 22 of the oscillator U11 and one end of the capacitor C83; the other end of the capacitor C83 is grounded.

5. A surface mount sampling phase locked oscillator according to claim 4, characterized in that: The model of oscillator U11 is HMC736LP4; Pin 20 of the oscillator U11 is connected to one end of the capacitor C82, one end of the capacitor C79, one end of the capacitor C78, ​​and pin 3 of the power filter U10. Pins 2 and 4 of the power filter U10 are grounded; pin 1 of the power filter U10 is connected to the +9V common terminal; Pin 16 of oscillator U11 is connected to one end of capacitor C75, and the other end of capacitor C75 is connected to pin 2 of RF amplifier A5; pin 8 of RF amplifier A5 is connected to one end of inductor L12 and one end of capacitor C76; the other end of inductor L12 is connected to one end of capacitor C66, one end of capacitor C67, and one end of resistor R56; the other end of capacitor C66 and the other end of capacitor C67 are grounded; the other end of resistor R56 is connected to one end of capacitor C65, one end of capacitor C63, and one end of capacitor C64 and connected to the common terminal 9V1; the other end of capacitor C65 is connected to the other end of capacitor C63, the other end of capacitor C64 and grounded; the other end of capacitor C76 serves as the RF signal output terminal RFout; pin 10 of oscillator U11 is connected to pin 1 of attenuator R34 in the above-mentioned phase-locking circuit.

6. A surface mount sampling phase locked oscillator according to claim 4, characterized in that: The operational amplifier circuit includes an operational amplifier A1; the model of the operational amplifier A1 is OPA172; the 3rd pin of the diode D5 is connected to one end of the resistor R24, the other end of the resistor R24 ​​is connected to one end of the resistor R21 and one end of the capacitor C35; the other end of the capacitor C35 is grounded; the other end of the resistor R21 is connected to one end of the resistor R14 and the 1st pin of the operational amplifier A1; the pin of the operational amplifier A1 is grounded; the 3rd pin of the operational amplifier A1 is connected to one end of the resistor R4; the other end of the resistor R4 is connected to the 1st pin of the single-chip computer U2, one end of the capacitor C9, and one end of the resistor R3; the other end of the capacitor C9 is connected to the other end of the resistor R3 and grounded; the 4th pin of the operational amplifier A1 is connected to one end of the resistor R8 and the other end of the resistor R14; the other end of the resistor R8 is grounded; the 5th pin of the operational amplifier A1 is connected to one end of the capacitor C11 and the common terminal 9V1; the other end of the capacitor C11 is grounded.