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Method for Taming and Holding a Crystal

A crystal oscillator, taming technology, applied in special data processing applications, instruments, complex mathematical operations, etc., can solve the problems of poor final frequency accuracy, large phase oscillation, long taming stabilization time, etc., to achieve high frequency accuracy and stability. , high-precision effect

Active Publication Date: 2020-05-19
成都盟升电子技术股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the taming algorithm, if the loop bandwidth is wide, the final frequency accuracy will be poor. If the loop bandwidth is narrow, the initial phase oscillation will be large and the taming stabilization time will be long; the frequency drift of the crystal oscillator cannot be eliminated in the hold algorithm, because the frequency drift of the crystal oscillator , the phase offset of the hold algorithm is proportional to the square of the hold time, so the phase offset (the time difference from the standard time) grows rapidly

Method used

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  • Method for Taming and Holding a Crystal
  • Method for Taming and Holding a Crystal
  • Method for Taming and Holding a Crystal

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Embodiment

[0040] First define the symbols, as shown in Table 1:

[0041] Table 1 Symbol Description

[0042] symbol Description counter0 Fitting stage counter, referred to as fitting counter counter1 Trace phase counter, abbreviated as trace counter counter2 Hold stage counter, referred to as hold counter dt Time difference measurement data N0 The number of continuous valid data required to complete the fitting phase N2 The maximum number of consecutive extrapolations for the hold phase a[] An array to store data during the fitting phase f Current crystal oscillator frequency control value Δt The time difference obtained in the fitting stage Δf The frequency difference obtained in the fitting stage k The number of filters in the tracking stage ParamArray[] k-group filter parameters CurParam Current filter parameters in the tracking phase VArray[] array of filter switch point counts ...

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Abstract

The invention discloses a quick taming and maintenance algorithm design of a crystal oscillator. The design comprises the three stages of fitting, tracking and maintaining. Fitting evaluation and a loop filter step-by-step bandwidth switching algorithm are used for crystal oscillator taming and maintaining, the crystal oscillator phase position can be quickly tamed, so that the frequency quickly achieves stability, and meanwhile, the accuracy and the stability of a higher frequency are obtained; after taming is conducted for a period of time, the output phase position and frequency can also maintain high precision in the maintaining process after external standard signals are lost.

Description

technical field [0001] The invention belongs to the technical field of crystal oscillator calculation in time-frequency systems and timing equipment, and in particular relates to a method for taming and maintaining the crystal oscillator. Background technique [0002] The existing crystal oscillator taming algorithms in time-frequency systems and timing equipment are mostly implemented by fixed phase-locked loops, and the holding algorithm is usually to maintain the crystal oscillator control state before the measurement fails. [0003] The traditional tame and hold algorithm has the following drawbacks: [0004] In the taming algorithm, if the loop bandwidth is wide, the final frequency accuracy will be poor. If the loop bandwidth is narrow, the initial phase oscillation will be large and the taming stabilization time will be long; the frequency drift of the crystal oscillator cannot be eliminated in the hold algorithm, because the frequency drift of the crystal oscillator ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/17G04G3/00
CPCG04G3/00G06F17/175
Inventor 向荣覃光全杨龚甫
Owner 成都盟升电子技术股份有限公司