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Measuring method of RC constant of ground capacitance

A technology of ground capacitance and measurement method, which is applied in the field of circuit devices to achieve the effect of improving the calibration speed and the convenience and flexibility of calibrating RC constants

Inactive Publication Date: 2011-10-26
GUANGZHOU RUNXIN INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Measuring method of RC constant of ground capacitance
  • Measuring method of RC constant of ground capacitance
  • Measuring method of RC constant of ground capacitance

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Embodiment Construction

[0035] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0036] Such as figure 1 The shown ground capacitance circuit module 105 is used to realize the RC constant and comparator 101 output RCOUT time length ( ) proportional relationship, the circuit specific working state conversion and Calculated as follows:

[0037] 1) At time t0, the switch S1102 is closed to reset the circuit, at this time , RCOUT output is low, the current flowing through the resistor R1103 is:

[0038] , ( 1 )

[0039] 2) At time t1, the switch S1103 is turned off, the reset process ends, and the current I flowing through the resistor R1103 passes through C1104, there are:

[0040] ,roll out: , ( 2 )

[0041] At this time capacitor C1 is charged, the voltage rise, leading to , the output of comparator 101 reverses, RCOUT turns from low level to high level, and the process from the...

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Abstract

The invention discloses a measuring method of a RC constant of a ground capacitance. According to the invention, on the basis of a circuit structure that takes a RC constant as a ground capacitance, the RC constant is converted to a pulse width and a digital circuit is employed, so that a measuring method aiming at the RC constant as the ground capacitance is realized. The method enables the measurement of the RC constant as the ground capacitance and correction of the RC constant in the circuit to be realized. A ground capacitance circuit module enables the conversion of the RC constant and a time constant to be realized easily, thereby providing a condition for measurement and correction by employing the digital circuit. The correction of the RC constant of the digital circuit can be carried out conveniently and agilely; and the binary search algorithm enables the correction speed to be enhanced substantially. Therefore, the method can be better applied to measurement and correction of a RC constant in a circuit structure of a ground capacitance.

Description

technical field [0001] The invention relates to an RC constant measurement method based on a grounded capacitor circuit structure, which is generally applied to the detection of small resistance and capacitance constants, such as a circuit device for detecting and effectively correcting the value of an RC constant by a 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 (resistance capacitance) 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 freque...

Claims

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Application Information

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IPC IPC(8): G01R27/04G01R27/26
Inventor 李正平黄伟朝方敏刘松艳
Owner GUANGZHOU RUNXIN INFORMATION TECH
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