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

A measurement method and frequency measurement technology, 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: 2011-10-05
GUANGZHOU RUNXIN INFORMATION TECH
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  • Abstract
  • Description
  • Claims
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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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  • Resistance capacitance (RC) constant measuring method based on frequency measurement
  • Resistance capacitance (RC) constant measuring method based on frequency measurement
  • Resistance capacitance (RC) constant measuring method based on frequency measurement

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Embodiment Construction

[0026] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] Such as Figure 1 to Figure 5 As shown, a method for measuring RC constants based on frequency measurement in the present invention includes a frequency oscillation circuit module, and the frequency oscillation circuit module 206 is as figure 1 As shown, the frequency oscillator consists of two integrators 103 forming a ring oscillator 101 loop. When the product of RC104 is a constant, the output of the ring oscillator is output by the voltage comparator 102 as a fixed-frequency square wave signal RCOUT202 (frequency oscillator output clock ), square wave signal frequency It is proportional to the RC resistance and capacitance, adjusting the size of RC104 can change the output frequency of the oscillator formed by the integration of the two integrators 103 , Calculated as follows:

[0028] ,( 1 )

[00...

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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 [0001] 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 [0002] 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 ...

Claims

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Application Information

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