A high stability time base oscillator automatic calibration circuit and method

An automatic calibration, oscillator technology, applied in the direction of automatic power control, electrical components, etc., can solve the problem that the frequency accuracy of the oscillator is affected by the external environment, relying on external references, etc., and achieves elimination of dependence, low noise, and high output voltage. stable effect

Active Publication Date: 2017-05-24
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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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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  • A high stability time base oscillator automatic calibration circuit and method
  • A high stability time base oscillator automatic calibration circuit and method
  • A 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 present invention proposes an automatic calibration circuit for a high-stable time-base oscillator, including: a control system, an FPGA control unit, a D / A conversion unit, and a stabilized power supply generation unit; the FPGA control unit detects the current frequency of the crystal oscillator, output offset value; the control system performs rough adjustment and high-precision calibration on the frequency of the crystal oscillator; the D / A conversion unit receives the aging rate DAC array output by the control system, converts it into an analog signal, and outputs EFC The voltage is sent to the voltage tuning terminal of the crystal oscillator; the stable voltage power generation unit includes a switching power supply and a linear stable power supply, and outputs a reference voltage to the reference terminal of the D / A conversion unit. The high-stable time-base oscillator automatic calibration circuit of the present invention eliminates the dependence on external precision reference signals and the frequency offset caused by the aging rate of crystal oscillators in other calibration methods.

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...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/099
Inventor 任水生
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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