CN113922814B - Signal generator based on phase-locked loop technology - Google Patents
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop
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- H—ELECTRICITY
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- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
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Abstract
The invention discloses a signal generator based on a phase-locked loop technology, which relates to the fields of radar, communication, automatic control, navigation technology and the like, and comprises two parts: the invention discloses a phase-locked loop module and a signal generator system, and designs a signal generator based on a phase-locked loop technology, so that the accurate piezoelectric control of a temperature compensation crystal oscillator is realized, the frequency change generated by the ambient temperature change is compensated through a temperature compensation circuit, the precision and the stability of the frequency are improved, a three-order passive loop filter is used for filtering a high-frequency component generated by a phase discriminator, and the high-frequency component and a phase-locked loop chip form a phase-locked loop control loop to control the output of signals.
Description
Technical Field
The invention relates to the fields of radar, communication, automatic control, navigation technology and the like.
Background
With the rapid development of radio technology, signal generators have become instruments and equipment commonly used in scientific research units and laboratories, are widely used in the fields of radar, communication, automatic control, civil aviation and the like, and have the characteristics of high precision, high stability and the like.
With the rapid development of electronic technology, a frequency synthesis technology can be used to generate a frequency source with high stability and meet the requirement of frequent frequency replacement in industry and research, so that a signal source meeting the requirement generated by the frequency synthesis technology is the core of the whole system design, and a method for synthesizing frequency by using a phase-locked loop technology is an important method in the frequency synthesis technology.
For harmonic treatment, the passive filter is a mature product, but can only filter specific harmonic times, so that the load filtering effect on working conditions such as large harmonic capacity, wide range, quick change and the like is poor. The active power filter is a novel power harmonic wave treatment special device which is made by adopting a modern power electronic technology and a digital signal processing technology based on a high-speed DSP device, integrates dynamic filtering, dynamic current compensation and dynamic reactive power compensation into a whole, has excellent performance, high filtering efficiency, wide filtering range, quick dynamic response, small volume and filtering effect which is not influenced by system change, but causes the limitation of engineering popularization and application due to the capacity limitation and the price reason.
A Temperature compensated crystal Oscillator (TCXO) is a quartz crystal Oscillator that compensates for a crystal oscillation frequency change caused by an ambient Temperature change by a Temperature compensation circuit added to an internal Temperature compensated crystal Oscillator chip, thereby achieving a high precision frequency Temperature stability. The temperature compensation crystal oscillator is widely applied to various communication devices, such as smart phones, wireless interphones, wireless communication base stations and the like.
When the temperature compensation crystal oscillator is produced, temperature calibration needs to be carried out, and a temperature compensation crystal oscillator chip in the temperature compensation crystal oscillator is programmed. The common method is to lead out a special chip pin on a chip of the temperature compensation crystal oscillator for communicating with external temperature compensation crystal oscillator chip test equipment. Fig. 1 is a schematic diagram illustrating a conventional temperature calibration and programming for a temperature compensated crystal oscillator chip.
In the traditional method, 3 wires are needed for a communication bus for communication between external test equipment of the temperature compensation crystal oscillator chip and the temperature compensation crystal oscillator chip, and the temperature compensation crystal oscillator chip also needs 3 extra pins to realize communication. However, the dedicated programming pin increases the complexity of the temperature compensation crystal oscillator chip, greatly increases the area and cost of the chip, and brings great disadvantages.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a signal generator based on a phase-locked loop technology.
The invention is realized by adopting the following technical scheme:
a signal generator based on phase-locked loop technology comprises a phase-locked loop module and a signal generator system, wherein the phase-locked loop module comprises a voltage-controlled oscillator, a phase discriminator and a loop filter; the output end of the phase discriminator is connected with the input end of a loop filter, the output end of the loop filter is connected with the input end of a voltage-controlled oscillator, and the output end of the voltage-controlled oscillator is connected with the input end of the phase discriminator;
the phase discriminator is used for detecting the phase difference of input signals, converting the detected phase difference into voltage signals for output, and forming control voltage of the voltage-controlled oscillator after the output voltage of the phase discriminator passes through the low-pass filter;
the loop filter important parameter adjusting device can change the loop capture band size, the loop capture time, the tracking time and the loop stability noise index by changing the parameters of the loop filter; the phase discriminator is used for filtering high-frequency components generated by the phase discriminator, outputting ripples, limiting out-of-band noise, and taking out average components to control the frequency of the voltage-controlled oscillator;
the signal generator system comprises a serial port liquid crystal screen, a power supply module, a single chip microcomputer, an AMS1117 module, a phase-locked loop chip, a temperature compensation crystal oscillator module and a second loop filter;
the output end of the power supply module is respectively connected with the input end of a serial port liquid crystal screen and the input end of the AMS1117 module, the output end of the serial port liquid crystal screen is connected with the input end of the single chip microcomputer, the output end of the AMS1117 module is connected with the input end of the single chip microcomputer, the output end of the single chip microcomputer is connected with the input end of a phase-locked loop chip, the output end of the temperature compensation crystal oscillator module is connected with the input end of the phase-locked loop chip, and the output end and the input end of the phase-locked loop chip are respectively connected with the input end of a second loop filter; the output end of the second loop filter is connected with the input end of the singlechip;
the power module comprises a chip U1, resistors R10, R11 and R12, diodes D4, D5 and D6, capacitors C5, C6, C7, C8, C9, C10 and C11, and inductors L4 and L5;
one end of a first resistor R10 is connected with the live wire L, the other end of the first resistor R10 is connected with the anode of a first diode D4, the cathode of the first diode D4 is respectively connected with one end of a first capacitor C5 and one end of a first inductor L4, the other end of the first inductor L4 is respectively connected with one end of a second capacitor C6 and a Drn pin of the chip U1, the other end of the first capacitor C5 is respectively connected with the other end of the second capacitor C6, the anode of the second diode D5, one end of a sixth capacitor C10, one end of a seventh capacitor C11 and a zero line N, one end of a third capacitor C7 is connected with a V pin of the chip U1, the other end of the third capacitor C7 is respectively connected with a Src pin of the chip U1, a Sre pin of the chip U1, one end of a fourth capacitor C8, one end of a second resistor R11, one end of the second inductor L5, the other end of the fourth capacitor C8, the other end of the fourth resistor C8 is respectively connected with a pin of the chip U1, the other end of the second resistor R11, the other end of the fifth capacitor C12 is respectively connected with a cathode of the third resistor R6, the cathode of the fifth resistor R5 is respectively connected with a 9, the cathode of the fifth capacitor C6 is connected with one end of the fifth capacitor C6 of the fifth diode D6, and the other end of the fifth diode D6, and the fifth diode D6 are respectively connected with the cathode of the fifth diode D5, and the other end of the fifth diode D6 of the fifth capacitor C6, and the fifth diode D6.
Furthermore, the phase discriminator adopts a sine wave phase detector and a pulse sampling and holding phase comparator.
Furthermore, the loop filter comprises a power supply bus, an active filter, a passive filter and a harmonic load source, wherein the active filter, the passive filter and the harmonic load source are connected in parallel to the power supply bus, the active filter and the passive filter are connected in series with a current transformer and a control switch, the current transformer and the control switch are connected in series to the power supply bus, one end of the passive filter is electrically connected with a switching switch, and the other end of the switching switch is respectively electrically connected with the power supply bus and the active filter; the active filter comprises an inductor L3, one end of the inductor L3 is electrically connected with a capacitor C3, the other end of the capacitor C3 is electrically connected with a double-winding inductor, the other end of the double-winding inductor is electrically connected with a circuit inverter, and the circuit inverter and the capacitor C4 form a closed loop.
Further, the passive filter includes a capacitor C1, one end of the capacitor C1 is electrically connected to the inductor L1, the other end of the inductor L1 is electrically connected to the resistor R1, the other end of the resistor R1 is connected to the inductor L2 and the capacitor C2, the other end of the inductor L2 is electrically connected to the resistor R2, the inductor L2 and the resistor R2 are connected in series, and the inductor L2 and the resistor R2 are connected to the resistor R1 in parallel with the capacitor C2: and the active filter and the fling-cut switch are respectively connected with the access end of the current transformer and the output end of the control switch.
Furthermore, the temperature compensation crystal oscillator module comprises a temperature compensation crystal oscillator chip, and the temperature compensation crystal oscillator chip comprises a piezoelectric control pin and a pin definition switching unit; when the temperature compensation crystal oscillator chip carries out temperature test calibration, the pin definition switching unit defines the piezoelectric control pin as a sharing protocol communication pin, so that external test equipment of the temperature compensation crystal oscillator chip communicates with the temperature compensation crystal oscillator chip through a sharing protocol of a communication bus and programs the temperature compensation crystal oscillator chip to store temperature adjustment parameters; after the temperature test is calibrated, when the temperature compensation crystal oscillator chip receives a programming instruction sent by external test equipment of the temperature compensation crystal oscillator chip through a communication bus, the pin definition switching unit switches the piezoelectric control pin to a high voltage for programming the temperature compensation crystal oscillator chip, and the temperature compensation crystal oscillator chip permanently writes a temperature adjustment parameter on the temperature compensation crystal oscillator chip; after the programming of the temperature adjustment parameters is completed, the pin definition switching unit cuts off the communication and programming functions of the piezoelectric control pin and restarts the same, and then the piezoelectric control pin is switched back to the piezoelectric control function.
Compared with the prior art, the invention adopting the technical scheme has the following beneficial effects:
the invention designs a signal generator based on the phase-locked loop technology, realizes the precise piezoelectric control of the temperature compensation crystal oscillator, compensates the frequency change generated by the ambient temperature change through a temperature compensation circuit, improves the precision and the stability of the frequency, filters out the high-frequency component generated by a phase discriminator by using a three-order passive loop filter, forms a phase-locked loop control loop with a phase-locked loop chip, and controls the output of signals.
The invention can provide a5V and 200mA non-isolated power supply for supplying power and can realize the accurate constant voltage regulation function; the power is supplied by the self-excited isolated power supply, and the power supply of the strong power area is supplied by the non-isolated power supply, so that 220V alternating current is prevented from entering the weak power area, and the reliability of the system is improved;
the piezoelectric control pin is arranged on the temperature compensation crystal oscillator chip, the shared piezoelectric control pin is defined, the piezoelectric control pin is enabled to be simultaneously used as a communication control pin of the temperature compensation crystal oscillator chip, communication and programming between the temperature compensation crystal oscillator chip and external test equipment of the temperature compensation crystal oscillator chip are realized, temperature adjustment and calibration of the temperature compensation crystal oscillator chip are completed, a special communication programming pin of the temperature compensation crystal oscillator chip is omitted, cost is saved, and substantial promotion is made on miniaturization and usability of the temperature compensation crystal oscillator module.
Drawings
FIG. 1 is a flow diagram of a phase locked loop module of the present invention;
FIG. 2 is a flow chart of the signal generator system of the present invention;
FIG. 3 is a circuit diagram of the power module of the present invention;
FIG. 4 is a schematic diagram of a loop filter of the present invention;
FIG. 5 is a schematic diagram of a temperature compensated crystal oscillator module according to the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be explained below with reference to the accompanying drawings:
the invention provides a phase-locked loop technology-based signal generator, which comprises a phase-locked loop module and a signal generator system, realizes accurate piezoelectric control of a temperature compensation crystal oscillator, compensates frequency change caused by ambient temperature change through a temperature compensation circuit, improves the precision and stability of frequency, filters high-frequency components generated by a phase discriminator by using a three-order passive loop filter, forms a phase-locked loop control loop with a phase-locked loop chip, and controls the output of signals.
The phase discriminator is used for detecting the phase difference of input signals, converting the detected phase difference into voltage signals to be output, and the output voltage of the phase discriminator forms the control voltage of the voltage-controlled oscillator after passing through the low-pass filter.
The loop filter is an important parameter adjusting device, and the loop capture band size, the loop capture time, the tracking time and the loop stability noise index can be changed by changing the parameters of the loop filter. The phase discriminator is used for filtering high-frequency components generated by the phase discriminator, outputting ripple and limiting out-of-band noise, and taking out average components to control the frequency of the voltage-controlled oscillator.
The phase discriminator, also called phase comparator, is an important component in the phase-locked loop, and the output voltage of the phase discriminator forms the control voltage of the voltage-controlled oscillator after passing through the low-pass filter. In a phase-locked loop, a loop filter is a low-pass filter essentially and is composed of a linear circuit composed of a capacitor and a resistor, on one hand, high-frequency components generated by a phase discriminator are filtered, and average components are taken out to control the output of a voltage-controlled oscillator, on the other hand, the loop filter is also an important parameter adjusting device, and the size of a loop capture band, the loop capture time, the tracking time, the loop stability, the noise index and the like can be changed by changing the parameters of the loop filter, so that the loop filter can directly influence the phase noise of an output signal, the purity of a frequency spectrum and the like. The voltage-controlled oscillator is a device for converting voltage into frequency, the output signal and the control voltage have corresponding functional relation, and the output signal and the control voltage are linear within a certain range, and the sensitivity is reduced when the output signal exceeds the range.
As shown in fig. 2, the signal generator system includes a serial liquid crystal display, a power module, a single chip, an AMS1117 module, a phase-locked loop chip, a temperature compensation crystal oscillator module, and a second loop filter; the signal generator can be used as a signal standard frequency source, a radio frequency signal source or test equipment, and a phase-locked loop chip and a loop filter are selected to form a phase-locked loop.
The output end of the power supply module is respectively connected with the input end of the serial port liquid crystal screen and the input end of the AMS1117 module, the output end of the serial port liquid crystal screen is connected with the input end of the single chip microcomputer, the output end of the AMS1117 module is connected with the input end of the single chip microcomputer, the output end of the single chip microcomputer is connected with the input end of the phase-locked loop chip, the output end of the temperature compensation crystal oscillator module is connected with the input end of the phase-locked loop chip, and the output and input end of the phase-locked loop chip is connected with the input end of the second loop filter; the output end of the second loop filter is connected with the input end of the singlechip;
as shown in fig. 3, the power module includes a chip U1, resistors R10, R11, and R12, diodes D4, D5, and D6, capacitors C5, C6, C7, C8, C9, C10, and C11, and inductors L4 and L5;
as shown in fig. 4, the loop filter includes a power supply bus 1, an active filter 4, a passive filter 5, and a harmonic load source 7, which are connected in parallel to the power supply bus 1, the active filter 4 and the passive filter 5 are connected in series with a current transformer 2 and a control switch 3, the current transformer 2 and the control switch 3 are connected in series to the power supply bus 1, one end of the passive filter 5 is electrically connected to a switching switch 6, and the other end of the switching switch 6 is electrically connected to the power supply bus 1 and the active filter 4, respectively.
Wherein, active filter 4 includes inductor L3, inductor L3's one end and electric capacity C3 electric connection, electric capacity C3's the other end and the 9 electric connection of bifilar inductor, and bifilar inductor 9's the other end electric connection circuit inverter 8, circuit inverter 8 forms closed loop with electric capacity C4, passive filter 5 includes electric capacity C1, electric capacity C1's one end electric connection inductor L1, inductor L1's the other end electric connection resistance R1, inductor L2 and electric capacity C2 are connected respectively to resistance R1's the other end, inductor L2's the other end electric connection resistance R2, and inductor L2 and resistance R2 series connection, inductor L2 and resistance R2 and the parallelly connected access resistance R1 of electric capacity C2, active filter 4 and fling-cut switch 6 insert current transformer 2's the access end and control switch's the access end that connects out respectively.
The harmonic load source 7 connected on the power supply bus 1 can generate a large amount of harmonic waves in the working process, the passive filter 5 sets a series branch circuit for the harmonic current of main characteristic times, so that the branch circuit presents low impedance to certain harmonic waves, the current always flows to the low impedance, therefore, the characteristic harmonic current flows to the series branch circuit and cannot flow to a system to cause system pollution, the current always flows to the low impedance, therefore, the characteristic harmonic current flows to the series branch circuit and cannot flow to the system to cause the system pollution, and the current transformer 2 and the active filter 4 in the circuit detect the current and voltage load values in the circuit in real time and quickly divide the harmonic current in favor, thereby leading the current flowing to the system to be an ideal alternating current sine wave shape, and the passive filter 5 mainly absorbs characteristic low-order harmonic waves and completes the compensation filtering task.
The invention provides a temperature compensation crystal oscillator module, which comprises a temperature compensation crystal oscillator chip. As shown in fig. 5, the temperature compensated crystal oscillator chip 100 includes a piezoelectric control pin 110 and a pin definition switching unit 120. When the temperature compensation crystal oscillator chip 100 performs temperature test calibration, the pin definition switching unit 120 defines the piezoelectric control pin 110 as a sharing protocol communication pin, so that the external test device 200 of the temperature compensation crystal oscillator chip communicates with the temperature compensation crystal oscillator chip 100 through the sharing protocol of the communication bus 300 and programs the temperature compensation crystal oscillator chip 100 to store the temperature adjustment parameter. After the temperature test is calibrated, when the temperature compensation crystal oscillator chip 100 receives a programming instruction sent by the external test device 200 of the temperature compensation crystal oscillator chip through the communication bus 300, the pin definition switching unit 120 switches the piezoelectric control pin 110 to a high voltage for programming the temperature compensation crystal oscillator chip 100, so that the temperature compensation crystal oscillator chip 100 permanently writes the temperature adjustment parameter on the temperature compensation crystal oscillator chip 100. Preferably, the high voltage for programming is 6.5V. The piezoelectric control pin 110 of the temperature compensation crystal oscillator chip 100 is used for defining the shared piezoelectric control pin 110, so that the piezoelectric control pin 110 simultaneously becomes a communication control pin of the temperature compensation crystal oscillator chip 110, communication and programming between the temperature compensation crystal oscillator chip 110 and external test equipment of the temperature compensation crystal oscillator chip are realized, temperature adjustment and calibration of the temperature compensation crystal oscillator chip 100 are completed, and a special communication programming pin of the temperature compensation crystal oscillator chip 100 is omitted.
The shared piezoelectric control pin is defined by the piezoelectric control pin of the temperature compensation crystal oscillator chip, so that the piezoelectric control pin simultaneously serves as the control pin of the temperature compensation crystal oscillator chip, communication and programming between the temperature compensation crystal oscillator chip and external test equipment of the temperature compensation crystal oscillator chip are realized, temperature adjustment and calibration of the temperature compensation crystal oscillator chip are completed, and a special communication programming pin of the temperature compensation crystal oscillator chip is omitted.
Claims (5)
1. A signal generator based on phase-locked loop technology, characterized by: the phase-locked loop circuit comprises a phase-locked loop module and a signal generator system, wherein the phase-locked loop module comprises a phase discriminator, a loop filter and a voltage-controlled oscillator;
the phase discriminator is used for detecting the phase difference of input signals, converting the detected phase difference into voltage signals to be output, and forming the control voltage of the voltage-controlled oscillator after the output voltage of the phase discriminator passes through the low-pass filter;
the loop filter is used for filtering high-frequency components generated by the phase discriminator, outputting ripple and limiting out-of-band noise, and taking out average components to control the voltage-controlled oscillator;
the signal generator system comprises a serial port liquid crystal screen, a power supply module, a single chip microcomputer, an AMS1117 module, a phase-locked loop chip, a temperature compensation crystal oscillator module and a second loop filter; the output end of the temperature compensation crystal oscillator module is connected with the input end of a phase discriminator, and the phase discriminator, a loop filter and a voltage-controlled oscillator are sequentially connected end to end; the output end of the power supply module is respectively connected with the input end of a serial port liquid crystal screen and the input end of the AMS1117 module, the output end of the serial port liquid crystal screen is connected with the input end of the single chip microcomputer, the output end of the AMS1117 module is connected with the input end of the single chip microcomputer, the output end of the single chip microcomputer is connected with the input end of a phase-locked loop chip, the output end of the temperature compensation crystal oscillator module is connected with the input end of the phase-locked loop chip, and the output end and the input end of the phase-locked loop chip are respectively connected with the input end of a second loop filter; the output end of the second loop filter is connected with the input end of the singlechip;
the power supply module comprises a chip U1, resistors R10, R11 and R12, diodes D4, D5 and D6, capacitors C5, C6, C7, C8, C9, C10 and C11, and inductors L4 and L5;
one end of a first resistor R10 is connected with the live wire L, the other end of the first resistor R10 is connected with the anode of a first diode D4, the cathode of the first diode D4 is respectively connected with one end of a first capacitor C5 and one end of a first inductor L4, the other end of the first inductor L4 is respectively connected with one end of a second capacitor C6 and a Drn pin of the chip U1, the other end of the first capacitor C5 is respectively connected with the other end of the second capacitor C6, the anode of the second diode D5, one end of a sixth capacitor C10, one end of a seventh capacitor C11 and a zero line N, one end of a third capacitor C7 is connected with a V pin of the chip U1, the other end of the third capacitor C7 is respectively connected with a Src pin of the chip U1, a Sre pin of the chip U1, one end of a fourth capacitor C8, one end of a second resistor R11, one end of the second inductor L5, the other end of the fourth capacitor C8, the other end of the fourth resistor C8 is respectively connected with a pin of the chip U1, the other end of the second resistor R11, the other end of the fifth capacitor C12 is respectively connected with a cathode of the third resistor R6, the cathode of the fifth resistor R5 is respectively connected with a 9, the cathode of the fifth capacitor C6 is connected with one end of the fifth capacitor C6 of the fifth diode D6, and the other end of the fifth diode D6, and the fifth diode D6 are respectively connected with the cathode of the fifth diode D5, and the other end of the fifth diode D6 of the fifth capacitor C6, and the fifth diode D6.
2. A signal generator based on phase-locked loop technology according to claim 1, characterized in that: the phase discriminator adopts a sine wave phase detector and a pulse sampling and holding phase comparator.
3. A phase-locked loop technology based signal generator as claimed in claim 1, wherein: the loop filter comprises a power supply bus, an active filter, a passive filter and a harmonic load source, wherein the active filter, the passive filter and the harmonic load source are connected in parallel to the power supply bus, the active filter and the passive filter are connected in series with a current transformer and a control switch, the current transformer and the control switch are connected in series to the power supply bus, one end of the passive filter is electrically connected with a switching switch, and the other end of the switching switch is respectively electrically connected with the power supply bus and the active filter; the active filter comprises an inductor L3, one end of the inductor L3 is electrically connected with a capacitor C3, the other end of the capacitor C3 is electrically connected with a double-winding inductor, the other end of the double-winding inductor is electrically connected with a circuit inverter, and the circuit inverter and the capacitor C4 form a closed loop.
4. A phase-locked loop technology based signal generator as claimed in claim 3, wherein: passive filter includes electric capacity C1, electric capacity C1's one end electric connection inductor L1, inductor L1's other end electric connection resistance R1, inductor L2 and electric capacity C2 are connected respectively to resistance R1's the other end, inductor L2's other end electric connection resistance R2, and inductor L2 and resistance R2 series connection, inductor L2 and resistance R2 and electric capacity C2 access resistance R1 that connects in parallel: and the active filter and the fling-cut switch are respectively connected with the access end of the current transformer and the output end of the control switch.
5. A signal generator based on phase-locked loop technology according to claim 1, characterized in that: the temperature compensation crystal oscillator module comprises a temperature compensation crystal oscillator chip, and the temperature compensation crystal oscillator chip comprises a piezoelectric control pin and a pin definition switching unit; when the temperature compensation crystal oscillator chip carries out temperature test calibration, the pin definition switching unit defines the piezoelectric control pin as a sharing protocol communication pin, so that external test equipment of the temperature compensation crystal oscillator chip communicates with the temperature compensation crystal oscillator chip through a sharing protocol of a communication bus and programs the temperature compensation crystal oscillator chip to store temperature adjustment parameters; after the temperature test is calibrated, when the temperature compensation crystal oscillator chip receives a programming instruction sent by external test equipment of the temperature compensation crystal oscillator chip through a communication bus, the pin definition switching unit switches the piezoelectric control pin to a high voltage for programming the temperature compensation crystal oscillator chip, and the temperature compensation crystal oscillator chip permanently writes a temperature adjustment parameter on the temperature compensation crystal oscillator chip; after the programming of the temperature adjustment parameters is completed, the pin definition switching unit cuts off the communication and programming functions of the piezoelectric control pin and restarts the same, and then the piezoelectric control pin is switched back to the piezoelectric control function.
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|---|---|---|---|---|
| CN103780253A (en) * | 2014-01-10 | 2014-05-07 | 苏州广纳达电子系统有限公司 | Reference signal generator using FPGA to control automatic frequency correction |
| CN104135280B (en) * | 2014-06-26 | 2020-09-18 | 西安空间无线电技术研究所 | Harmonic generation and mixing frequency source circuit |
| CN212012609U (en) * | 2020-03-25 | 2020-11-24 | 成都九洲迪飞科技有限责任公司 | Internal and external reference self-adaptive switching circuit |
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2021
- 2021-09-30 CN CN202111158058.5A patent/CN113922814B/en active Active
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