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Resistance capacitance (RC) constant measuring method based on frequency measurement

A technology of frequency measurement and measurement method, applied in the direction of measuring electrical variables, measuring devices, measuring resistance/reactance/impedance, etc., to achieve the effect of improving the correction speed

Active Publication Date: 2013-01-02
GUANGZHOU RUNXIN INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the on-chip resistors and capacitors generally have a deviation of 10% to 25%, the corner frequency affecting the filter is as high as ±50%.

Method used

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Abstract

The invention discloses a resistance capacitance (RC) constant measuring method based on frequency measurement. Based on the output frequency measurement and the RC constant design, and the relationship between an output frequency of an oscillator and an RC constant in the frequency oscillator, the RC constant measurement based on the frequency measurement and the application of RC constant measurement in correction of a frequency oscillating circuit are realized. A measurement modular circuit effectively realizes the frequency oscillating circuit according to the fact that the RC constant setting and the output frequency have a definite inverse proportional relationship, and provides preconditions for the digital circuit measurement and correction adjustment. A digital circuit is convenient and flexible to measure an oscillating frequency and the RC constant; and a correction speed is greatly improved by a binary search algorithm.

Description

technical field The invention relates to a method for measuring RC (resistance-capacitance) constants, in particular to a method for measuring RC constants based on frequency measurement. Background technique At present, the measurement of RC constants is used in many applications and circuit structures, such as analog filters, frequency synthesizers, voltage-controlled oscillators and other circuits, RC constants need to be measured and corrected to an appropriate range. The measurement of the RC constant is generally not a direct measurement, but through certain means, the RC product constant is converted into other physical quantities, so as to carry out effective and accurate measurement. For the oscillator structure, the frequency of the oscillation output is inversely proportional to the product of the RC resistance and capacitance. For a fixed output frequency, the RC constant in the circuit should be constant, so the measurement and correction of the RC constant can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/00G01R35/00
Inventor 李正平方敏刘松艳黄伟朝
Owner GUANGZHOU RUNXIN INFORMATION TECH
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