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Double-second-order active RC filter circuit and compensation method thereof

A filter circuit and compensation method technology, applied in the field of filters, can solve the problems of insufficient compensation, excessive compensation, uncontrollable leading phase amount, etc., and achieve the effect of reducing power consumption and minimizing sensitivity

Active Publication Date: 2014-05-14
GUANGZHOU RUNXIN INFORMATION TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] One of the purposes of the present invention is to propose a biquad active RC filter circuit, which can solve the problem of uncontrollable lead phase
[0020] The second object of the present invention is to propose a compensation method for a biquad active RC filter circuit, which can solve the problem of insufficient or excessive compensation

Method used

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  • Double-second-order active RC filter circuit and compensation method thereof
  • Double-second-order active RC filter circuit and compensation method thereof
  • Double-second-order active RC filter circuit and compensation method thereof

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Embodiment Construction

[0041] In the following, the present invention will be further described in conjunction with the drawings and specific embodiments.

[0042] Such as Figure 4 As shown, a biquad active RC filter circuit includes an Akerberg-Mossberg biquad unit and a resistor R5.

[0043] Described Akerberg-Mossberg biquad unit comprises resistance R1, resistance R2, resistance R3, resistance R4, resistance Rb1, resistance Rb2, electric capacity C1, electric capacity C2, operational amplifier A1, operational amplifier A2 and operational amplifier A3, the operational amplifier A1 The inverting input terminal is connected to a signal input terminal Vin through a resistor R1, the non-inverting input terminal of the operational amplifier A1 is grounded, the output terminal of the operational amplifier A1 passes between the resistor R3 and the non-inverting input terminal of the operational amplifier A2, and the capacitor C1 One end of the resistor R1 is connected between the inverting input termi...

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Abstract

The invention relates to a double-second-order active RC filter circuit and a compensation method thereof. The circuit comprises an Akerberg-Mossberg double-second-order unit and a resistor R5, wherein one end of the resistor R5 is connected with the inverted input end of an operational amplifier A1 of the Akerberg-Mossberg double-second-order unit, and the other end of the resistor R5 is connected with the output end of an operational amplifier A3 of the Akerberg-Mossberg double-second-order unit. According to the double-second-order active RC filter circuit and the compensation method thereof, the double-second-order active filter circuit with a high Q value is built by using the operational amplifiers with low gain bandwidth products, sensitiveness to the gain bandwidth products of the operational amplifiers of the Q value is minimized, and power consumption of a filter is reduced. An active feedback network is built by means of an existing reverse buffer, leading phase quantity matched with the gain bandwidth products of the operational amplifiers is provided, and the best phase compensation is conducted on consumption of two integrators of a feed-forward network in a frequency range of a filter transmission band.

Description

technical field [0001] The present invention relates to filter technology. Background technique [0002] The biquad unit is the basic building block of an active RC filter. A low-pass biquad cell is a circuit with the following transfer function, [0003] T ( s ) = H ω 0 2 s 2 + s ( ω 0 Q ) + ω 0 2 (Formula 1) [0004] Among them: the center frequency is ω0, the quality factor is Q, and the DC gain is H. [0005] Filters are com...

Claims

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Application Information

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IPC IPC(8): H03H11/12
Inventor 张伟锋王祥炜黎玉珠
Owner GUANGZHOU RUNXIN INFORMATION TECH
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