Active filter circuit

A source filter and circuit technology, applied in the network using active components, electrical components, impedance network and other directions, can solve problems such as quality factor change, and achieve the effect of changing gain, reducing cost and small space

Pending Publication Date: 2019-12-24
YANFENG AUTOMOTIVE TRIM SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the fact that the active analog filter in the prior art is based on operational amplifiers, resistors and capacitors. When the gain is changed, the quality factor of the active filter circuit will also change, requiring staff Only by adjusting the resistance and capacitance can the defect of quality factor be maintained, an active filter circuit is provided

Method used

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Embodiment Construction

[0044] The present invention is further illustrated below by means of examples, but the present invention is not limited to the scope of the examples.

[0045] Such as figure 2 As shown, the active filter circuit of this embodiment includes a base circuit 1, a first transistor Q1, a second transistor Q2, a first resistor R1 and a second resistor R2.

[0046] The first end of the base circuit 1 is electrically connected to the AC voltage supply terminal Vi(t), and the second end of the base circuit 1 is electrically connected to the base of the first triode Q1;

[0047] The collector of the first transistor Q1 is electrically connected to the base of the second transistor Q2, and the emitter of the first transistor Q1 is respectively connected to the third end of the base circuit 1, one end of the first resistor R1 and the second end of the first resistor R1. One end of the second resistor R2 is electrically connected, and the other end of the first resistor R1 is grounded; ...

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Abstract

The invention discloses an active filter circuit. The active filter circuit comprises a base circuit, a first triode, a second triode, a first resistor and a second resistor, the first end of the basecircuit is electrically connected with the alternating-current voltage power supply end, and the second end of the base circuit is electrically connected with the base of the first triode; the collector of the first triode is electrically connected with the base of the second triode, the emitter of the first triode is electrically connected with the third end of the base circuit, one end of the first resistor and one end of the second resistor, and the other end of the first resistor is grounded; the other end of the second resistor is electrically connected with the collector of the second triode and the AC voltage output end, and the emitter of the second triode is electrically connected with the DC power supply end. According to the circuit, the quality factor of the filter is not influenced while the gain of the filter is changed; in addition, the active filter circuit provided by the invention also has the advantages of occupying a small printing plate space and reducing the cost.

Description

technical field [0001] The invention relates to the technical field of circuit design, in particular to an active filter circuit. Background technique [0002] Active analog filters are widely used in analog signal reception and signal processing. They are mainly used to filter out signal out-of-band noise, improve the signal-to-noise ratio of the signal and the anti-interference ability of the circuit. [0003] With the rapid development of integrated operational amplifiers, active analog filters composed of operational amplifiers, resistors and capacitors have also been widely used. Such active filter circuits have the characteristics of no inductance and adjustable gain, but their existence The following defects: [0004] Take the Sallen-key low-pass filter (a low-pass filter) as an example, such as figure 1 As shown, including resistors R11 and R12, capacitors C11 and C12, K represents the magnification of the operational amplifier, Vi(t) represents the AC voltage inpu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H11/12
CPCH03H11/1213H03H11/1217
Inventor 王辉
Owner YANFENG AUTOMOTIVE TRIM SYST CO LTD
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