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RC constant measuring method of differential capacitance

A technology of differential capacitance and measurement method, which is applied in the field of circuit devices to achieve the effect of convenient and flexible correction of RC constants and improvement of correction speed

Inactive Publication Date: 2011-10-26
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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  • RC constant measuring method of differential capacitance
  • RC constant measuring method of differential capacitance
  • RC constant measuring method of differential capacitance

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Embodiment Construction

[0034] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0035] Such as figure 1 and figure 2 As shown, a method for measuring the RC constant of a differential capacitance according to the present invention includes a differential capacitance circuit module 106 and Measurement module 201;

[0036] The differential capacitance circuit module 106 is used to realize the RC constant and the comparator output RCOUT time length ( ), the proportional relationship of the specific working state of the circuit and the Calculated as follows:

[0037] At time t0, the switch S1101 is closed to reset the circuit, at this time , the RCOUT output is low because the , the current flowing through the resistor R1102 is:

[0038] , (1)

[0039] At time t1, the switch S1101 is turned off, the reset process is over, and the current I flowing through the resistor R1102 passes thro...

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Abstract

The invention discloses an RC (resistance capacitance) constant measuring method of differential capacitance. The method provided by the invention is based on a circuit structure of which differential capacitance is an RC constant, converts the RC constant into a pulse width, and uses a digital circuit to measure the RC constant of the differential capacitance. The method measures the RC constant of the differential capacitance and corrects the same in a circuit, and the method can be widely used in the field of measurement and correction on the RC constant of the differential capacitance better. A measuring module circuit simply implements the conversion between the RC constant and an RC out voltage value, so that the condition for measuring and correcting the RC constant through the digital circuit is provided, the digital circuit can flexibly and conveniently correct the RC constant, and the correction speed is greatly improved through a binary search algorithm.

Description

technical field [0001] The invention relates to an RC constant measurement method based on a differential capacitance circuit structure, which is generally applied to the detection of small resistance-capacitance constant products, such as a circuit device for detecting and effectively correcting the RC constant value in an analog filter. Background technique [0002] Currently, in analog filter design, the corner frequency of the filter, which is inversely proportional to the product of the resistor and capacitor. For a particular filter, its RC constant should be constant. On-chip integrated filters are generally divided into active RC (resistor-capacitor) and (transconductance capacitance) two structures. When the structure achieves transconductance, resistors are generally used, so that . 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%. The corner frequency of the fi...

Claims

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Application Information

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