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Multi-output tunable filter circuit

A filter circuit, multi-output technology, applied in the field of filtering, can solve the problems of circuit Q value limitation, loss increase, inability to meet, etc., to achieve the effect of preventing electromagnetic interference, reducing filter loss, and preventing loss increase

Inactive Publication Date: 2017-05-24
宁波斯凯勒智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing active filter circuit generally chooses to connect an appropriate RC network in the input branch and feedback loop of the operational amplifier, but due to the open-loop gain of the operational amplifier, the input and output impedance cannot be ideal, which will lead to this The Q value of such circuits is greatly limited, which increases the loss, and its function is too single to meet the growing needs

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  • Multi-output tunable filter circuit

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Embodiment Construction

[0009] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0010] See figure 1, a multi-output adjustable filter circuit, including an input port Vin, a first output port Vout1, a second output port Vout2, a third output port Vout3, a fourth output port Vout4, a first resistor R1, a second resistor R2, a second Three resistors R3, fourth resistor R4, fifth resistor R5, sixth resistor R6, seventh resistor R7, eighth resistor R8, ninth resistor R9, tenth resistor R10, eleventh resistor R11, twelfth resistor R12 , the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the Seven capacitors C7, the first potentiometer RW1, the second potentiometer RW2, the third potentiometer RW3, the first op amp U1, the second op amp U2, the third...

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Abstract

The invention discloses a multi-output tunable filter circuit. Good sensitivity is obtained through the coordination of multi-level operational amplifiers, and the Q value can be increased through the attenuation and amplification of signals and a bootstrapping mode formed by feeding back to a double T network, and thus the reduction of efficiency caused by the increased loss can be prevented; the Q value can also be adjusted by adjusting the feedback quantity through a potentiometer to avoid an overlarge high frequency resonant gain; and additionally, the high-pass, low-pass, band-pass and notch filtering functions can be realized at the same time, and the diversity of the functions can be guaranteed.

Description

technical field [0001] The invention relates to the field of filtering, in particular to a multi-output adjustable filtering circuit. Background technique [0002] The Q value is the main parameter to measure the inductance device, which refers to the ratio of the inductive reactance presented by the inductor to its equivalent loss resistance when the inductor is operating at a certain frequency of AC voltage. [0003] The existing active filter circuit generally chooses to connect an appropriate RC network in the input branch and feedback loop of the operational amplifier, but due to the open-loop gain of the operational amplifier, the input and output impedance cannot be ideal, which will lead to this The Q value of such circuits is greatly limited, which increases the loss, and its function is too single to meet the growing needs. Contents of the invention [0004] The object of the present invention is a high-Q and adjustable filter circuit. [0005] The present inve...

Claims

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Application Information

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IPC IPC(8): H03H11/12H03H7/01
CPCH03H7/01H03H11/1234
Inventor 乐东岳张国锐
Owner 宁波斯凯勒智能科技有限公司