OSC frequency automatic calibration circuit and automatic calibration method

An automatic calibration and frequency technology, applied to the automatic control of power, electrical components, etc., to achieve the effect of reducing the number of tests, simple detection principle, and accelerated calibration speed

Active Publication Date: 2014-03-12
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The error needs to be taken as an absolute value, and an additional absolute value calculation circuit is required

Method used

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  • OSC frequency automatic calibration circuit and automatic calibration method
  • OSC frequency automatic calibration circuit and automatic calibration method
  • OSC frequency automatic calibration circuit and automatic calibration method

Examples

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Embodiment Construction

[0044] Such as figure 2 Shown is the structure diagram of the OSC frequency automatic calibration circuit of the embodiment of the present invention; the OSC frequency automatic calibration circuit of the embodiment of the present invention includes: a parameter generator 1, an OSC circuit 2, a frequency error detection circuit 3, a calibration end judgment circuit 4, and a parameter adding Minus control circuit 5.

[0045] The output terminal of the parameter generator 1 outputs the control parameter PARAM to the OSC circuit 2 .

[0046] The output end of the OSC circuit 2 outputs a clock signal OSCOUT to the frequency error detection circuit 3, the frequency of the clock signal OSCOUT is regulated by the control parameter PARAM, the larger the control parameter PARAM, the greater the clock signal The higher the frequency of OSCOUT is, the smaller the control parameter PARAM is, and the smaller the frequency of the clock signal OSCOUT is.

[0047] The input terminal of the...

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PUM

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Abstract

The invention discloses an OSC frequency automatic calibration circuit comprising a parameter generator, an OSC circuit, a frequency error detection circuit, a calibration ending judgment circuit and a parameter adding and subtracting control circuit. The frequency error detection circuit is connected with a reference time window signal and a center frequency indication signal, and frequency error detection is performed on a clock signal according to the reference time window signal and the center frequency indication signal, and a frequency error value is calculated. The calibration ending judgment circuit judges whether frequency automatic calibration is ended or not and whether frequency automatic calibration is successful or failed. When calibration is not ended, the parameter adding and subtracting control circuit outputs a parameter adding and subtracting control signal to the parameter generator and adjusts a control parameter, wherein the adjusting amplitude is directly proportional to the frequency error value. The invention discloses an automatic calibration method of the OSC frequency automatic calibration circuit. The circuit is simple in detection principle and small in circuit area. Parameter adjustment is directly proportional to the frequency error value so that calibration speed can be enhanced.

Description

technical field [0001] The invention relates to the field of semiconductor integrated circuits, in particular to an OSC (oscillator) frequency automatic calibration circuit; the invention also relates to an automatic calibration method for the OSC frequency automatic calibration circuit. Background technique [0002] The existing OSC automatic calibration method is to count the clock signal output by the OSC circuit within a given length of time, subtract the count value of the standard frequency clock signal from the count value, and obtain the absolute value of the difference between the two As a frequency error, it is used to judge whether the frequency of the clock signal output by the OSC circuit reaches the calibration. [0003] like figure 1 Shown is the existing OSC frequency automatic calibration circuit structure diagram. The existing OSC frequency automatic calibration circuit includes: OSC circuit 101, timing counting circuit 102, absolute error calculation cir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/24
Inventor 雷冬梅赵锋张爱东
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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