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Bootstrap high-pass filtering circuit

A high-pass filter circuit and resistor technology, applied in the field of signal measurement, can solve the problems of high price, large attenuation, large volume and weight, etc., and achieve the effect of low cost and light weight

Inactive Publication Date: 2013-03-20
KUNSHAN BEIJI PHOTOELECTRON SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The traditional passive high-pass filter composed of LC network has the disadvantages of large volume and weight, high price and large attenuation, while the active filter composed of integrated operational amplifier and RC network has good isolation between input and output. It is convenient for cascading, therefore, a bootstrap high-pass filter circuit based on integrated operational amplifier and RC network is essential

Method used

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  • Bootstrap high-pass filtering circuit

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with accompanying drawing.

[0012] refer to figure 1 , an embodiment of the present invention is shown in the figure, a bootstrap high-pass filter circuit is characterized in that it includes: an operational amplifier A1, a capacitor C and resistors R1-R4, wherein:

[0013] Resistor R4 and capacitor C form a low-pass filter, and the cut-off frequency is fc=1.1R4*C;

[0014] Resistance R1=R2=R3=R0;

[0015] The voltage at the positive-phase input terminal and the negative-phase input terminal of the operational amplifier A1 are equal, and the current flowing through is zero, then the current I2 flowing through the resistor R2=fin / R0, the current I3=fo / R0 flowing through the resistor R3, and the feedback If= Vout / R1,

[0016] The voltage of the positive phase input terminal and the negative phase input terminal of the operational amplifier A1 are equal, and the current flowing is zero, then I2+I3=-If...

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Abstract

The invention discloses a bootstrap high-pass filtering circuit. The circuit comprises an operational amplifier A1, a capacitor C and resistors R1-R4. The bootstrap high-pass filtering circuit can achieve high-pass filtering to frequency signals and has the advantages of being light in weight, low in cost, small in attenuation, convenient to cascade and the like.

Description

technical field [0001] The invention belongs to the field of signal measurement, in particular to a bootstrap high-pass filter circuit. Background technique [0002] The traditional passive high-pass filter composed of LC network has the disadvantages of large volume and weight, high price and large attenuation, while the active filter composed of integrated operational amplifier and RC network has good isolation between input and output. It is convenient for cascading, therefore, a bootstrap high-pass filter circuit based on integrated operational amplifier and RC network is essential. Contents of the invention [0003] The purpose of the present invention is to provide a bootstrap high-pass filter circuit. [0004] The technical solution for achieving the above object is: a bootstrap high-pass filter circuit, characterized in that it includes: an operational amplifier A1, a capacitor C and resistors R1-R4, wherein: [0005] A resistor R2 is connected in series between ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H11/12
Inventor 杨向萍
Owner KUNSHAN BEIJI PHOTOELECTRON SCI & TECH
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