Temperature compensate crystal oscillator based on analog circuit

A technology of crystal oscillator and temperature compensation, which is applied in power oscillators, electrical components, automatic power control, etc., can solve the problems of restricting the frequency compensation accuracy of high-frequency temperature-compensated crystal oscillators, and achieve easy integration, mass production, and compensation process Simple, structured effect

Active Publication Date: 2017-10-20
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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  • Application Information

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Problems solved by technology

Seriously restricts the frequency compensation accuracy of high-frequency temperature-compensated crystal oscillators

Method used

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  • Temperature compensate crystal oscillator based on analog circuit
  • Temperature compensate crystal oscillator based on analog circuit
  • Temperature compensate crystal oscillator based on analog circuit

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Embodiment Construction

[0036] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0037] figure 2 It is the principle block diagram of the temperature compensation crystal oscillator based on the analog circuit of the present invention.

[0038] In this example, if figure 2 As shown, the temperature-compensated crystal oscillator based on an analog circuit of the present invention includes a voltage-controlled crystal oscillator 1 , a power divider 2 , a frequency-voltage conversion circuit 3 , a voltage comparison circuit 4 and a filter 5 . The current output frequency of the voltage-controlled crystal oscillator 1 is f=f by the power divider 2 0 T...

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Abstract

The invention discloses a temperature compensate crystal oscillator based on an analog circuit. The temperature compensate crystal oscillator adopts the closed-loop feedback compensation architecture, an output signal is divided into two paths, wherein one path is input into a frequency-voltage conversion circuit; a voltage signal corresponding to the current temperature point is obtained according to the output frequency of a voltage-controlled crystal oscillator, the voltage signal is subtracted from the reference voltage through the voltage comparison circuit, and then amplified to obtain a compensate voltage signal; the compensate voltage signal is filtered through a filter, and then is fed back to a voltage-controlled voltage control end of the voltage-controlled crystal oscillator to perform the compensation, so that the voltage-controlled crystal oscillator outputs the signal with an expected frequency, wherein the expected frequency is the target frequency f0. The temperature compensate crystal oscillator directly converts the frequency related to the temperature in real time into the compensate voltage signal, which is in one-to-one corresponding mapping relation with the temperature related frequency to perform the temperature compensation without needing a temperature sensor. The method can overcome the temperature hysteresis problem caused by asynchronous wafer temperature change of the temperature sensor and the crystal resonator in the existing TCXO (temperature compensate crystal oscillator).

Description

technical field [0001] The invention belongs to the technical field of crystal oscillators, and more specifically relates to a temperature-compensated crystal oscillator based on an analog circuit. Background technique [0002] Temperature Compensated Crystal Oscillator (TCXO, Temperature Compensate Xtal (crystal) Oscillator) is a kind of crystal oscillator that can work in a wide temperature range and maintain the output frequency of the crystal oscillator within a certain accuracy range (10 -6 ~10 -7 order of magnitude) crystal oscillator. It has the characteristics of low power, can work immediately after starting up, and has high stability. It is widely used in various communications, navigation, radar, satellite positioning systems, mobile communications, program-controlled telephone exchanges, and various electronic measuring instruments. [0003] The existing temperature-compensated crystal oscillator is essentially a voltage-controlled crystal oscillator (Voltage C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L1/02
CPCH03L1/02H03L1/023H03L1/028H03L7/00H03L7/06H03B5/04H03B5/366
Inventor 谭峰邱渡裕叶芃陈计全郭连平曾浩张硕唐科
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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