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Active filter

A source filter, filter circuit technology, applied in impedance networks, adaptive networks, electrical components and other directions, can solve problems such as fluctuations

Active Publication Date: 2013-05-01
SHANGHAI BEILING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the active filter design integrated with resistor-capacitor-operational amplifier (R-C-OPAMP), the resistor and capacitor values ​​directly determine the characteristics of the filter. However, in the integrated circuit design, the resistor and capacitor values ​​on the chip will vary with the process, There are great fluctuations due to changes in temperature and working voltage. Generally, the deviation of the resistance value provided by the process manufacturer is ±20%, and the deviation of the capacitance value is ±15%. The -3dB corner frequency of the filter corresponding to the capacitance value and resistance value will also Therefore, it is necessary to provide a method that can adaptively adjust the corner frequency of the filter to make its performance stable and usable

Method used

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Embodiment Construction

[0028] The composition and working principle of the active filter of the present invention will be described in detail below with reference to the drawings and specific implementation methods.

[0029] In general, the active filter of the present invention, on the basis of the active filter circuit, adds an adjustment circuit capable of self-adaptive adjustment, introduces a reference negative resistance as a reference in the adjustment circuit, and utilizes the adjustable resistance and the reference Negative resistances are connected in parallel to form a resistance matching unit. When the adjustable resistance changes due to different environments, the control signal is generated by the integral filter unit and the subsequent circuit, which is fed back to the adjustable resistance to adjust it, so as to achieve a stable circuit; and Correspondingly, in the active filter, the input resistance and feedback resistance of the integrators at all levels are set to be the same as t...

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Abstract

The invention discloses an active filter, comprising an active filtering circuit. The active filter further comprises an adjusting circuit; the adjusting circuit comprises a resistor matching unit, an integral filtering unit and a control signal generation unit, wherein the resistor matching unit comprises an adjustable resistor and a reference negative resistor matched with the adjustable resistor; the integral filtering unit is connected with the resistor matching unit and is used for carrying out integral operation and filtering treatment on current output by the resistor matching unit; and the control signal generation unit is connected with the integral filtering unit and is used for generating a signal output of the integral filtering unit and generating a control signal to adjust a resistance value of the adjustable resistor. The active filter disclosed by the invention can be used for self-adapted adjustment of the active filtering circuit.

Description

technical field [0001] The invention relates to an integrated active filter circuit, more specifically, an active filter with self-adaptive adjustment function. Background technique [0002] In the active filter design integrated with resistor-capacitor-operational amplifier (R-C-OPAMP), the resistor and capacitor values ​​directly determine the characteristics of the filter. However, in the integrated circuit design, the resistor and capacitor values ​​on the chip will vary with the process, There are great fluctuations due to changes in temperature and working voltage. Generally, the resistance value deviation provided by the process manufacturer is ±20%, and the capacitance value deviation is ±15%. The -3dB corner frequency of the filter corresponding to the capacitance value and resistance value will also Therefore, it is necessary to provide a method that can adaptively adjust the corner frequency of the filter to make its performance stable and usable. [0003] At pre...

Claims

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Application Information

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IPC IPC(8): H03H11/04H03H21/00
Inventor 李鹏张亮吴艳辉陈丽陈宁张辉
Owner SHANGHAI BEILING
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