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Band-pass filter circuit

A technology of band-pass filtering and low-pass filtering, applied in the field of electronics, can solve problems such as narrow band-pass filtering range

Inactive Publication Date: 2010-06-16
BEIJING YINGHUADA SOFTWARE ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a band-pass filter circuit to solve the problem of narrow band-pass filter range in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1, see figure 1 As shown, the circuit is composed of a low-pass filter A1, a DC blocking circuit A2 and a high-pass filter A3 in series in sequence, and the high-pass cut-off frequency of the high-pass filter must be smaller than the low-pass cut-off frequency of the low-pass filter, so as to form a crossover Broadband filter band, otherwise the effect is full resistance effect.

[0012] In practical application, the signal to be filtered is connected to one side of the low-pass filter, processed by the low-pass filter, DC blocking circuit and high-pass filter, and then output to obtain a wide range of filtered signals.

Embodiment 2

[0013] Embodiment 2, see figure 2 As shown, the circuit is a closed loop composed of low-pass filter A1, DC blocking circuit A2, high-pass filter A3 and microcontroller A4. The high-pass cut-off frequency of the high-pass filter and the low-pass cut-off frequency of the low-pass filter are determined by Provided by MCU programming, and the high-pass cut-off frequency must be smaller than the low-pass cut-off frequency.

[0014] In practical application, the high-pass cut-off frequency and low-pass cut-off frequency are set through the single-chip microcomputer first, and then the signal to be filtered is connected to the side of the low-pass filter, and then output after being processed by the low-pass filter, DC blocking circuit and high-pass filter. A wide range of filtered signals can be obtained.

[0015] In this embodiment, since the cut-off frequency of the high and low pass is controllable, it can also be used in a narrow range of occasions, and the versatility is qui...

Embodiment 3

[0016] Embodiment 3, see image 3 Shown is the actual circuit diagram of Embodiment 2 of the present invention.

[0017] The model of the integrated filter chip U1 used therein is LMF100, and LMF100 can provide 2-way 2nd-order filtering. In the present invention, one of them adopts low-pass filtering, and a low-pass filtering circuit is composed of R1, R2, R3, R4, C1 and a part of U1 chips. Pin 1 outputs the signal after low-pass filtering, and the other channel uses high-pass filtering. The high-pass filtering circuit is composed of R5, R6, R7, R8, C3 and part of the U1 chip, and its pin 18 outputs the signal after high-pass filtering. Connect with a capacitor C2 (i.e. to achieve figure 1 with figure 2 The effect of the intermediate direct circuit). The high and low pass filtering frequencies of these 2-way filter circuits are provided by the programmable microcontroller A4.

[0018] The basis for the single-chip microcomputer to send the cut-off frequency in this embodi...

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PUM

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Abstract

The invention discloses a band-pass filter circuit, relating to the technical field of electrons, and used for solving the problem of narrow band-pass filter range in the prior art. The band-pass filter circuit comprises a low-pass filter, a direct current blocking circuit and a high-pass filter which are sequentially connected in series, wherein the high-pass cut-off frequency of the high-pass filter is lower than the low-pass cut-off frequency of the low-pass filter; and input signals to be filtered are input from one side of the low-pass filter and are outputted after being processed by the low-pass filter, the direct current blocking circuit and the high-pass filter. The band-pass filter circuit enhances the filtering range without influencing the quality of the band-pass filter circuit.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a band-pass filter circuit. Background technique [0002] Generally, active bandpass filter circuits can be divided into two types: discrete component combination and integrated circuit. Discrete components mainly refer to active filter circuits composed of operational amplifiers, resistors, capacitors, etc. The disadvantages are obvious, the circuit is complex, and the band-pass center frequency is difficult to change once it is determined, and it is useless when the center frequency needs to be changed at any time. The land of martial arts. The active filter circuit of the integrated circuit is simple and has few external components. Some integrated active band-pass filter circuits can control the center frequency of the band-pass. For example, in order to realize the controllable cut-off frequency, the integrated circuit LMF100 is directly used. Pin 19 can directly produ...

Claims

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Application Information

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IPC IPC(8): H03H7/12G05B19/042
Inventor 潘勇严可国
Owner BEIJING YINGHUADA SOFTWARE ENG
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