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High-stability time base oscillator automatic calibration circuit and method

An automatic calibration and oscillator technology, applied in the automatic control of power, electrical components, etc., can solve the problems of dependence on external references, oscillator frequency accuracy affected by the external environment, etc., to achieve the elimination of dependence, high stability of output voltage, and elimination of Effect of Frequency Offset

Active Publication Date: 2014-01-08
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0013] The invention proposes an automatic calibration circuit and method for a high-stable time-base oscillator, which solves the problems in the prior art that the frequency accuracy of the oscillator is affected by the external environment and relies on external references

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  • High-stability time base oscillator automatic calibration circuit and method

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Embodiment Construction

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0040] Such as figure 1 As shown, the high-stable time-base oscillator automatic calibration circuit of the present invention includes: a control system 20 , an FPGA control unit 40 , a D / A conversion unit 30 and a regulated power supply generation unit 60 .

[0041] The FPGA control unit 40 detects the current frequency of the crystal oscillator 50 , compares it with the nominal frequency of the crystal oscillator 50 , and outputs an offset value. The contro...

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Abstract

The invention provides a high-stability time base oscillator automatic calibration circuit, which comprises a control system, an FPGA (Field Programmable Gata Array) control unit, a D / A (Digital to Analog) conversion unit and a voltage-stabilizing power supply generating unit, wherein the FPGA control unit is used for detecting the current frequency of a crystal oscillator, and outputting an offset value; the control system is used for performing coarse tuning and high-precision calibration on the frequency of the crystal oscillator; the D / A conversion unit is used for receiving an aging rate DAC (Digital to Analog Conversion) array output by the control system, converting into an analog signal, and outputting EFC (Electrical Frequency Control) voltage to the voltage tuning end of the crystal oscillator; the voltage-stabilizing power supply generating unit comprises a switch voltage-stabilizing power supply and a linear voltage-stabilizing power supply, and is used for outputting reference voltage to the reference end of the D / A conversion unit. According to the high-stability time base oscillator automatic calibration circuit, the dependence on external accurate reference signals and frequency offset caused by the aging rate of the crystal oscillator existing in other calibration methods are eliminated.

Description

technical field [0001] The invention relates to the technical field of testing, in particular to an automatic calibration circuit for a high-stable time-base oscillator, and also relates to an automatic calibration method for a high-stable time-base oscillator. Background technique [0002] In modern society, in various fields such as satellite navigation, communication, broadcasting, radar, precision guidance, electronic countermeasures, remote control and telemetry, crystal oscillators are indispensable components, and the frequency accuracy of crystal oscillators is increasingly required. high. The industry has used temperature compensation techniques to design oven-controlled crystal oscillators (OCXOs) with greatly improved frequency stability. But with the passage of time, even the constant temperature crystal oscillator, its frequency accuracy will gradually deteriorate, the main reasons include aging, changes in the external environment, voltage control voltage offs...

Claims

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Application Information

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IPC IPC(8): H03L7/099
Inventor 任水生
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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