CN211481235U - Oscillator circuit - Google Patents
Oscillator circuit Download PDFInfo
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- CN211481235U CN211481235U CN202020236017.8U CN202020236017U CN211481235U CN 211481235 U CN211481235 U CN 211481235U CN 202020236017 U CN202020236017 U CN 202020236017U CN 211481235 U CN211481235 U CN 211481235U
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Abstract
The embodiment of the utility model discloses oscillator circuit. The oscillator circuit includes: the system comprises a control interface, a controller, a crystal oscillation circuit, a filter network circuit and a frequency output interface; the controller comprises a first input end and a second input end; the first input end of the controller is connected with the control interface, and the output end of the crystal oscillation circuit is connected with the input end of the filter network circuit; the filter network circuit comprises a first output end and a second output end; the first output end of the filter network circuit is connected with the second input end of the controller, the second output end of the filter network circuit is connected with the frequency output interface, and the frequency output interface outputs the oscillation frequency; realizes the purpose of completing the crystal without depending on a temperature compensation network circuit and an adjustable resistor voltage division circuitThe temperature stability and the frequency accuracy of the oscillator are adjusted, the frequency calibration degree of the crystal oscillator is improved, and the adjustment resolution reaches 1020Simple operation and low cost and volume.
Description
Technical Field
The embodiment of the utility model provides a relate to crystal oscillation technical field, especially relate to an oscillator circuit.
Background
A crystal oscillator is an electronic component for generating high-precision oscillation frequency, and in practical applications, the temperature stability and frequency precision of the crystal oscillator are two of the most important indicators.
The temperature stability of the traditional temperature compensation crystal oscillator overcomes the change of crystal oscillator frequency caused by temperature change by a temperature compensation network circuit combined by external independent thermistors, and has poor consistency and inconvenient debugging. In addition, the traditional frequency modulation method for the frequency precision is realized by voltage division of an adjustable resistor or by building a digital-to-analog converter circuit, and the precision is also limited.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides an oscillator circuit to the realization is adjusting at the temperature stability and the frequency precision that do not rely on temperature compensation network circuit and adjustable varistor bleeder circuit to accomplish the crystal oscillator, improves the frequency calibration degree and easy and simple to handle of crystal oscillator.
An embodiment of the utility model provides an oscillator circuit, this oscillator circuit includes: the system comprises a control interface, a controller, a crystal oscillation circuit, a filter network circuit and a frequency output interface;
the controller comprises a first input end and a second input end; the first input end of the controller is connected with the control interface, the output end of the controller is connected with the input end of the crystal oscillation circuit, and the output end of the crystal oscillation circuit is connected with the input end of the filter network circuit;
the filter network circuit comprises a first output end and a second output end; the first output end of the filter network circuit is connected with the second input end of the controller, the second output end of the filter network circuit is connected with the frequency output interface, and the frequency output interface outputs the oscillation frequency.
Optionally, the control interface is a serial port.
Optionally, the controller further includes a reference interface, and the reference interface is accessed to the reference pulse signal; the oscillator circuit further comprises a temperature sensor, and the temperature sensor is connected with the controller.
Optionally, the filter network circuit comprises a first amplifying circuit, a second amplifying circuit and a filter circuit;
the input end of the first amplifying circuit is used as the input end of the filter network circuit, the output end of the first amplifying circuit is connected with the first output end of the filter network circuit and the input end of the second amplifying circuit, the control end of the first amplifying circuit is connected with a set power supply signal, and the first amplifying circuit is grounded;
the output end of the second amplifying circuit is connected with the input end of the filter circuit, and the output end of the filter circuit is used as the second output end of the filter network circuit.
Optionally, the filter network circuit further comprises a first resistor; the output end of the first amplifying circuit is connected with the first output end of the filter network circuit through a first resistor.
Optionally, the first amplification circuit comprises an amplifier; the amplifier is used for amplifying the frequency input to the filter network circuit by the crystal oscillation circuit.
Optionally, the first amplifying circuit further comprises a first capacitor and a second resistor;
the first end of the first capacitor is used as the input end of the first amplifying circuit, the second end of the first capacitor is connected with the input end of the amplifier, and the output end of the amplifier is used as the output end of the first amplifying circuit;
the first end of the second resistor is connected with the input end of the amplifier, and the second end of the second resistor is connected with the output end of the amplifier.
Optionally, the filter network circuit further includes a third resistor and a second capacitor;
a first end of the third resistor is connected with a set power supply signal, and a second end of the third resistor is connected with a control end of the first amplifying circuit;
the first end of the second capacitor is connected with the second end of the third resistor, and the second end of the second capacitor is grounded.
Optionally, the filter circuit includes a first inductor, a second inductor, a third capacitor, a fourth capacitor, a fifth capacitor, and a sixth capacitor;
the first end of the first inductor is used as the input end of the filter circuit, and the second end of the first inductor is connected with the first end of the third capacitor;
the second end of the third capacitor is connected with the first end of the fourth capacitor;
the second end of the fourth capacitor is connected with the first end of the second inductor;
the second end of the second inductor is used as the output end of the filter circuit;
the first end of the fifth capacitor is connected with the second end of the second inductor, and the second end of the fifth capacitor is grounded;
the first end of the sixth capacitor is connected with the second end of the third capacitor, and the second end of the sixth capacitor is grounded.
The embodiment of the utility model provides an oscillator circuit includes: the system comprises a control interface, a controller, a crystal oscillation circuit, a filter network circuit and a frequency output interface; the controller comprises a first input end and a second input end; the first input end of the controller is connected with the control interface, the output end of the controller is connected with the input end of the crystal oscillation circuit, and the output end of the crystal oscillation circuit is connected with the input end of the filter network circuit; the filter network circuit comprises a first output end and a second output end; the first output end of the filter network circuit is connected with the second input end of the controller, the second output end of the filter network circuit is connected with the frequency output interface, and the frequency output interface outputs the oscillation frequency. Therefore, the problem that the change of crystal oscillator frequency caused by temperature change is overcome by a temperature compensation network circuit combined by external independent thermistors, the consistency is poor, and the debugging is inconvenient is solved; and the frequency modulation mode of the frequency precision is realized by voltage division of the adjustable rheostat or by building a digital-to-analog converter circuit, the precision is limited, the temperature stability and the frequency precision of the crystal oscillator are adjusted without depending on a temperature compensation network circuit and the adjustable rheostat voltage division circuit, the frequency calibration degree of the crystal oscillator is improved, and the adjustment resolution can reach 1020Simple operation and low cost and volume.
Drawings
Fig. 1 is a schematic diagram of an oscillator circuit according to an embodiment of the present invention;
fig. 2 is a temperature stability learning curve of an oscillator circuit according to an embodiment of the present invention;
fig. 3 is a curve of a corresponding relationship between a current temperature and a temperature stability output from the frequency output interface before temperature compensation of the oscillator circuit according to the embodiment of the present invention;
fig. 4 is a curve of a corresponding relationship between a current temperature and a temperature stability output from the frequency output interface after temperature compensation of the oscillator circuit provided by the embodiment of the present invention;
fig. 5 is a schematic diagram of another oscillator circuit structure according to an embodiment of the present invention;
fig. 6 is a circuit diagram of a filter network circuit of an oscillator circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic diagram of an oscillator circuit according to an embodiment of the present invention, as shown in fig. 1, the oscillator circuit includes: a control interface 10, a controller 20, a crystal oscillation circuit 30, a filter network circuit 40 and a frequency output interface 50;
the controller 20 comprises a first input and a second input; a first input end of the controller 20 is connected with the control interface 10, an output end of the controller 20 is connected with an input end of the crystal oscillation circuit 30, and an output end of the crystal oscillation circuit 30 is connected with an input end G of the filter network circuit 40;
the filter network circuit 40 comprises a first output E and a second output F; a first output E of the filter network circuit 40 is connected to a second input of the controller 20, a second output F of the filter network circuit 40 is connected to the frequency output interface 50, and the frequency output interface 50 outputs the oscillation frequency.
Specifically, as in the oscillator circuit shown in fig. 1, the smaller the amplitude of the change in the crystal frequency due to the change in the ambient temperature, the better the temperature stability of the crystal oscillator, a 1pps reference pulse signal is input to the controller 20, and the controller 20 outputs a driving voltage from its output terminal to the input terminal of the crystal oscillator circuit 30 according to the reference pulse signal. For example, the controller 20 outputs a driving voltage d1 from its output terminal to the input terminal of the crystal oscillator circuit 30 according to the reference pulse signal, the controller 20 records the output driving voltage d1, the temperature sensor can be used to collect the current temperature of the surrounding environment where the crystal oscillator is located, the controller 20 records the current temperature when the driving voltage d1 is correspondingly output as t1, the crystal oscillator circuit 30 outputs a crystal oscillator frequency f1 corresponding to the driving voltage d1 (i.e. corresponding to the current temperature t1) from its output terminal to the input terminal G of the filter network circuit 40 according to the driving voltage d1, the filter network circuit 40 divides the crystal oscillator frequency f1 into two paths and outputs one path from its first output terminal E to the second input terminal of the controller 20, the controller 20 calculates the temperature stability of the oscillator circuit corresponding to the crystal oscillator frequency f1 according to the crystal oscillator frequency f1 from the filter network circuit 40 and records the temperature stability, the temperature stability refers to the change of the environment temperature, the drift degree of the crystal oscillator frequency caused by the environmental change is that the actual crystal oscillator frequency is F1, the nominal crystal oscillator frequency determined by the oscillator circuit is F0, the temperature stability is equal to (F1-F0)/F0, and the filter network circuit 40 outputs the other path from the second output end F to the frequency output interface 50 for the user to use; then, the controller 20 automatically changes the driving voltage value outputted to the crystal oscillation circuit 30 according to the reference pulse signal, for example, the driving voltages d2, d3, d4 … … are input, and the current temperature corresponding to each input driving voltage is collected, and recording the temperature stability corresponding to each current temperature to complete the temperature compensation learning of the oscillator circuit and obtain the corresponding relationship between the temperature and the temperature stability, fig. 2 is a temperature stability learning curve of the oscillator circuit according to the embodiment of the present invention, as shown in fig. 2, the horizontal axis represents sequentially recorded temperatures, the unit is, the temperature acquisition range is from-60 ℃ to 120 ℃, the vertical axis represents sequentially recorded temperature stability corresponding to the current temperature, the temperature stability for the current temperature ranges from 47ppm to 72ppm, for example 67ppm for an oscillator circuit at 40 ℃ when a current temperature of 40 ℃ is detected.
A frequency modulation value command is input to the controller 20 from a first input end of the controller 20 through the control interface 10, the controller 20 converts the frequency modulation value command into a driving voltage D1, meanwhile, the controller 20 obtains a temperature compensation driving voltage D2 corresponding to the current temperature according to the current temperature acquired by the temperature sensor and a learned temperature stability learning curve, and inputs the sum D3 of D1 and D2 as a total driving voltage to the crystal oscillation circuit 30, the crystal oscillation circuit 30 outputs a crystal oscillator frequency to the filter network circuit 40 according to the driving voltage D3, the filter network circuit 40 outputs the crystal oscillator frequency from a second output end F to the frequency output interface 50, and the crystal oscillator frequency output to the frequency output interface 50 is directly used by a user through the frequency output interface 50. Fig. 3 is a graph of a corresponding relationship between a current temperature and a temperature stability output from a frequency output interface before temperature compensation of an oscillator circuit provided by an embodiment of the present invention, where a horizontal axis is a temperature recorded in sequence, and a unit is a temperature, an acquisition range of the temperature is from-40 ℃ to 85 ℃, a vertical axis is a temperature stability recorded in sequence and corresponding to the current temperature, and a temperature stability range corresponding to the current temperature is-1.2 ppm to 1.5ppm, for example, a temperature stability of the oscillator circuit corresponding to-15 ℃ is 1.5ppm when the current temperature is-15 ℃ is acquired; fig. 4 is a graph of a corresponding relationship between a current temperature and a temperature stability output from a frequency output interface after temperature compensation of an oscillator circuit provided by an embodiment of the present invention, where a horizontal axis represents sequentially recorded temperatures, and a unit is, a temperature acquisition range is from-40 ℃ to 85 ℃ below zero, a vertical axis represents sequentially recorded temperature stabilities corresponding to the current temperatures, and a temperature stability range corresponding to the current temperatures is-30 ppb to 50ppb, for example, when a current temperature is acquired to be-15 ℃, a temperature stability of an oscillator circuit corresponding to-15 ℃ is-5 ppb; comparing fig. 4 with fig. 3, it can be seen that the temperature stability curve after temperature compensation is more stable than the temperature stability curve after temperature compensation and both the maximum value and the minimum value are greatly reduced, so that the frequency of the oscillator circuit after temperature compensationThe calibration degree is obviously improved, and the adjustment resolution can reach 1020。
The oscillator circuit is not subjected to temperature compensation, that is, only the frequency accuracy is adjusted by the controller 20, the temperature stability curve before temperature compensation is obtained by inputting a frequency modulation value command from a first input end of the controller 20 to the controller 20 through the control interface 10, the controller 20 converts the frequency modulation value command into a driving voltage D1, and inputs D1 as a total driving voltage to the crystal oscillation circuit 30, the crystal oscillation circuit 30 outputs the crystal oscillation frequency to the filter network circuit 40 according to the driving voltage D1, and the filter network circuit 40 outputs the crystal oscillation frequency from a second output end F to the frequency output interface 50. In summary, regardless of whether the oscillator circuit is temperature compensated, the controller 20 can receive the frequency modulation value from the control interface 10 through the first input terminal thereof, and adjust the driving voltage input to the crystal oscillation circuit 30 according to the frequency modulation value command to adjust the crystal frequency output from the filter network circuit 40 to the frequency output interface 50, so as to achieve the adjustment of the temperature stability and the frequency accuracy of the crystal oscillator without depending on the temperature compensation network circuit and the adjustable resistor voltage dividing circuit, and the operation is simple and the cost and the volume are low.
The embodiment of the utility model provides an oscillator circuit includes control interface, controller, crystal oscillation circuit, filter network circuit and frequency output interface; inputting the crystal oscillator frequency input from the crystal oscillation circuit to a controller through a filter network circuit to complete temperature compensation learning of the oscillator circuit; the controller obtains a temperature compensation driving voltage corresponding to the current temperature according to a current temperature acquired by the temperature sensor and a learned temperature stability learning curve, and inputs the sum of a frequency modulation command input from the control interface and the temperature compensation driving voltage as a total driving voltage to the crystal oscillation circuit, so that the frequency calibration degree of the oscillator circuit is improved, and the adjustment resolution can reach 1020The temperature stability and the frequency accuracy of the crystal oscillator can be adjusted without depending on a temperature compensation network circuit and an adjustable resistor voltage division circuit, the operation is simple and convenient, and the cost and the volume are low.
Alternatively, referring to fig. 1, the control interface 10 is a serial port.
Specifically, the control interface 10 is a serial port, the controller 20 is connected to the control interface 10 by the serial port, and the controller 20 receives a serial command corresponding to the fm value command from the control interface 10.
Optionally, fig. 5 is a schematic diagram of another oscillator circuit structure provided in the embodiment of the present invention, as shown in fig. 5, the controller 20 further includes a reference interface 60, and the reference interface 60 accesses the reference pulse signal; the oscillator circuit further comprises a temperature sensor 70, the temperature sensor 70 being connected to the controller 20.
Specifically, as shown in fig. 5, the oscillator circuit accesses a 1pps reference pulse signal to the controller 20 through the reference interface 60, the controller 20 outputs a driving voltage to the input end of the crystal oscillation circuit 30 from the output end thereof according to the reference pulse signal and records the input driving voltage, the temperature sensor 70 is used to collect the current temperature of the ambient environment where the crystal oscillator is located, the temperature sensor 70 feeds back the collected current temperature to the controller 20, and the controller 20 records the current temperature.
Optionally, fig. 6 is a circuit diagram of a filter network circuit of an oscillator circuit provided in the present invention, as shown in fig. 6, the filter network circuit 40 includes a first amplifying circuit 100, a second amplifying circuit 200 and a filter circuit 300;
the input end of the first amplifying circuit 100 is used as the input end G of the filter network circuit 40, the output end of the first amplifying circuit 100 is connected with the first output end E of the filter network circuit 40 and the input end of the second amplifying circuit 200, the control end of the first amplifying circuit 100 is connected with a set power supply signal, and the first amplifying circuit 100 is grounded;
the output terminal of the second amplifying circuit 200 is connected to the input terminal of the filter circuit 300, and the output terminal of the filter circuit 300 is used as the second output terminal F of the filter network circuit 40.
Specifically, the crystal oscillation circuit 30 outputs the crystal oscillation frequency from the output terminal thereof to the first amplifying circuit 100 according to the driving voltage, the first amplifying circuit 100 amplifies and divides the crystal oscillation frequency, the power is divided into one square wave signal and one sine wave signal, the one square wave signal is fed back to the controller 20 through the first output terminal E of the filter network circuit 40, the one sine wave signal is output to the second amplifying circuit 200, the second amplifying circuit 200 amplifies and shapes the one sine wave signal and outputs the one sine wave signal to the filter circuit 300, and the filter circuit 300 filters the one shaped and amplified sine wave signal and outputs the one sine wave signal to the second output terminal F of the filter network circuit 40.
Optionally, referring to fig. 6, the filter network circuit 40 further includes a first resistor R1; the output of the first amplifier circuit 100 is connected to the first output E of the filter network circuit 40 via a first resistor R1.
Specifically, the first amplifying circuit 100 outputs the divided one-path square wave signal to the first output terminal E of the filter network circuit 40 through the first resistor R1, and outputs the signal to the controller 20.
Alternatively, referring to fig. 6, the first amplification circuit 100 includes an amplifier D1; the amplifier D1 is used to amplify the frequency input by the crystal oscillator circuit 30 to the filter network circuit 40. In addition, the second amplifying circuit 200 may also include an amplifier, for example, an amplifier D2, to amplify one of the sine wave signals.
Specifically, the crystal oscillation circuit 30 outputs the crystal oscillation frequency from its output terminal to the first amplification circuit 100 according to the drive voltage, and the first amplification circuit 100 amplifies the crystal oscillation frequency by the amplifier D1.
Optionally, referring to fig. 6, the first amplifying circuit 100 further includes a first capacitor C1 and a second resistor R2;
a first end of the first capacitor C1 is used as an input end of the first amplifying circuit 100, a second end of the first capacitor C1 is connected with an input end of the amplifier, and an output end of the amplifier is used as an output end of the first amplifying circuit 100;
a first terminal of the second resistor R2 is connected to the input terminal of the amplifier, and a second terminal of the second resistor R2 is connected to the output terminal of the amplifier.
Specifically, the first capacitor C1 filters the crystal oscillation frequency f1 output from the crystal oscillation circuit 30 to the first amplification circuit 100.
Optionally, referring to fig. 6, the filter network circuit 40 further includes a third resistor R3 and a second capacitor C2;
a first end of the third resistor R3 is connected to a set power supply signal Vcc, and a second end of the third resistor R3 is connected to a control end of the first amplifying circuit 100;
the first end of the second capacitor C2 is connected to the second end of the third resistor R3, and the second end of the second capacitor C2 is grounded.
Specifically, the filter network circuit 40 is powered by the set power supply signal Vcc through the third resistor R3 and the second capacitor C2, so that the filter network circuit 40 operates normally.
Optionally, referring to fig. 6, the filter circuit 300 includes a first inductor L1, a second inductor L2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6;
a first end of the first inductor L1 is used as an input end of the filter circuit 300, and a second end of the first inductor L1 is connected with a first end of the third capacitor C3;
the second end of the third capacitor C3 is connected with the first end of the fourth capacitor C4;
a second end of the fourth capacitor C4 is connected to a first end of the second inductor L2;
a second terminal of the second inductor L2 serves as an output terminal of the filter circuit 300;
a first end of the fifth capacitor C5 is connected to the second end of the second inductor L2, and a second end of the fifth capacitor C5 is grounded;
the first terminal of the sixth capacitor C6 is connected to the second terminal of the third capacitor C3, and the second terminal of the sixth capacitor C6 is grounded.
Specifically, the filter circuit 300 filters the shaped and amplified sinusoidal signal and outputs the filtered sinusoidal signal to the second output terminal F of the filter network circuit 40. In addition, the second amplifying circuit 200 and the filtering circuit 300 can isolate two paths of signals, i.e., one path of square wave signal and one path of sine wave signal, which are power-divided, so as to prevent the square wave signal output to the controller 20 from being affected by the sine wave signal output to the frequency output interface 50, the frequency fluctuation caused by load fluctuation and output impedance mismatching, and thus, the accuracy of the obtained corresponding relationship between the temperature and the temperature stability is affected.
The embodiment of the utility model provides an oscillator electricityThe circuit comprises a control interface, a controller, a reference interface, a temperature sensor, a crystal oscillation circuit, a filter network circuit and a frequency output interface; the filter network circuit comprises a first amplifying circuit, a second amplifying circuit and a filter circuit. The method comprises the steps that a reference pulse signal is input into a controller from a reference interface, the controller outputs a driving voltage corresponding to the reference pulse signal to a crystal oscillation circuit, the controller records the driving voltage, the crystal oscillation circuit outputs a crystal oscillator frequency corresponding to the driving voltage to a filter network circuit, the filter network circuit divides the crystal oscillator frequency shaping power into a square wave signal and a sine wave signal and feeds the square wave signal back to the controller, the controller records the fed-back crystal oscillator frequency, meanwhile, a temperature sensor is used for collecting the current temperature and the controller records the current temperature, temperature control point collection is completed, the controller sequentially and automatically changes the driving voltage value to carry out next temperature control point collection, temperature compensation learning of the oscillator circuit is completed, and the corresponding relation between the temperature and the temperature stability is obtained. The method comprises the steps that a serial frequency modulation value instruction is output to a controller from a control interface, the controller inputs the sum of a driving voltage corresponding to the frequency modulation value instruction and a temperature compensation driving voltage corresponding to the current temperature obtained according to a temperature compensation learning curve to a crystal oscillator as a total driving voltage, the crystal oscillator outputs a crystal oscillator frequency corresponding to the total driving voltage to a filter network circuit, the filter network circuit amplifies and filters the crystal oscillator frequency and outputs the crystal oscillator frequency to a frequency output interface for a user, the frequency calibration degree of the oscillator circuit is improved, and the adjustment resolution can reach 1020The temperature stability and the frequency accuracy of the crystal oscillator can be adjusted without depending on a temperature compensation network circuit and an adjustable resistor voltage division circuit, the operation is simple and convenient, and the cost and the volume are low.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (9)
1. An oscillator circuit, comprising: the system comprises a control interface, a controller, a crystal oscillation circuit, a filter network circuit and a frequency output interface;
the controller comprises a first input and a second input; the first input end of the controller is connected with the control interface, the output end of the controller is connected with the input end of the crystal oscillation circuit, and the output end of the crystal oscillation circuit is connected with the input end of the filter network circuit;
the filter network circuit comprises a first output end and a second output end; the first output end of the filter network circuit is connected with the second input end of the controller, the second output end of the filter network circuit is connected with the frequency output interface, and the frequency output interface outputs oscillation frequency.
2. The oscillator circuit of claim 1, wherein the control interface is a serial port.
3. The oscillator circuit of claim 1, wherein the controller further comprises a reference interface, the reference interface accessing a reference pulse signal;
the oscillator circuit further comprises a temperature sensor connected to the controller.
4. The oscillator circuit of claim 3, wherein the filter network circuit comprises a first amplification circuit, a second amplification circuit, and a filter circuit;
the input end of the first amplifying circuit is used as the input end of the filter network circuit, the output end of the first amplifying circuit is connected with the first output end of the filter network circuit and the input end of the second amplifying circuit, the control end of the first amplifying circuit is connected with a set power supply signal, and the first amplifying circuit is grounded;
the output end of the second amplifying circuit is connected with the input end of the filter circuit, and the output end of the filter circuit is used as the second output end of the filter network circuit.
5. The oscillator circuit of claim 4, wherein the filter network circuit further comprises a first resistor; the output end of the first amplifying circuit is connected with the first output end of the filter network circuit through the first resistor.
6. The oscillator circuit of claim 4, wherein the first amplification circuit comprises an amplifier; the amplifier is used for amplifying the frequency input to the filter network circuit by the crystal oscillation circuit.
7. The oscillator circuit of claim 6, wherein the first amplification circuit further comprises a first capacitor and a second resistor;
a first end of the first capacitor is used as an input end of the first amplifying circuit, a second end of the first capacitor is connected with an input end of the amplifier, and an output end of the amplifier is used as an output end of the first amplifying circuit;
the first end of the second resistor is connected with the input end of the amplifier, and the second end of the second resistor is connected with the output end of the amplifier.
8. The oscillator circuit of claim 7, wherein the filter network circuit further comprises a third resistor and a second capacitor;
a first end of the third resistor is connected to the set power supply signal, and a second end of the third resistor is connected with a control end of the first amplifying circuit;
and the first end of the second capacitor is connected with the second end of the third resistor, and the second end of the second capacitor is grounded.
9. The oscillator circuit of claim 4, wherein the filter circuit comprises a first inductor, a second inductor, a third capacitor, a fourth capacitor, a fifth capacitor, and a sixth capacitor;
a first end of the first inductor is used as an input end of the filter circuit, and a second end of the first inductor is connected with a first end of the third capacitor;
the second end of the third capacitor is connected with the first end of the fourth capacitor;
the second end of the fourth capacitor is connected with the first end of the second inductor;
a second end of the second inductor is used as an output end of the filter circuit;
a first end of the fifth capacitor is connected with a second end of the second inductor, and a second end of the fifth capacitor is grounded;
and the first end of the sixth capacitor is connected with the second end of the third capacitor, and the second end of the sixth capacitor is grounded.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112290935A (en) * | 2020-10-15 | 2021-01-29 | 上海鸿晔电子科技股份有限公司 | Crystal oscillator frequency adjusting method and circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112290935A (en) * | 2020-10-15 | 2021-01-29 | 上海鸿晔电子科技股份有限公司 | Crystal oscillator frequency adjusting method and circuit |
| CN112290935B (en) * | 2020-10-15 | 2022-09-30 | 上海鸿晔电子科技股份有限公司 | Crystal oscillator frequency adjusting method and circuit |
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| GR01 | Patent grant |