Dynamic pulse integral circuit not influenced by frequency

Abstract

The invention discloses a dynamic pulse integral circuit not influenced by frequency. The dynamic pulse integral circuit not influenced by the frequency mainly solves the problem that an existing dynamic pulse integral circuit is influenced by the frequency. The dynamic pulse integral circuit not influenced by the frequency comprises a frequency selection circuit (1), a band-pass filter (2), a comparator (3), an integrator (4) and a schmitt trigger (5), wherein the frequency selection circuit (1) outputs a frequency selection signal VFS which is connected with a first input end of the band-pass filter (2) and a first input end of the integrator (4) , a second input end of the band-pass filter (2) is connected with an input end VIN of a chip where the band-pass filter (2) is located, the band-pass filter (2) outputs a filtering signal VBPF, a comparison signal VCMP is output after the filtering signal VBPF passes the comparator (3), an integrated signal VINT is output to the schmitt trigger (5) after the comparison signal VCMP is integrated by the integrator (4), and after reforming of the schmitt trigger (5), an output signal VOUT of the dynamic pulse integral circuit is output. The dynamic pulse integral circuit not influenced by the frequency enables the dynamic pulse integral circuit to integrate input signals with various frequencies accurately.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and relates to an analog integrated circuit, in particular to a dynamic pulse integration circuit not affected by frequency. Background technique [0002] Infrared transmission circuits have the advantages of low cost, early popularization time, and high transmission speed, and are widely used in household appliances and car audio-visual navigation systems. The infrared receiver is an important part of the infrared transmission circuit. In the infrared receiver, an integrating circuit composed of an integrated operational amplifier is usually used to filter out the carrier frequency. The performance of the integrating circuit directly affects the performance of the infrared receiver. Therefore, the research on the integrating circuit in the infrared receiver has attracted more and more attention. [0003] figure 1 Shown is the circuit schematic diagram of the existing integration ci...

AI Technical Summary

Problems solved by technology

[0004] Since the time of the integral rising edge of the above integral circuit is fixed, the output of the integral circuit will change with the frequency of the integral signal, so that the integral circuit cannot accurately integrate the integral signal containing multiple frequencies, which limits the infrared The development of receiving circuits

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