Band-pass filtering dual-oscillation system based on Colpitts oscillator circuit

Abstract

The invention discloses a phase-shift processing based band-pass filtering oscillation system. The phase-shift processing based band-pass filtering oscillation system mainly comprises a signal transformation circuit, a signal amplification circuit connected with the signal transformation circuit, a band-pass filtering circuit connected with the signal amplification circuit, and a buffer circuit. The phase-shift processing based band-pass filtering oscillation system is characterized in that a phase-shift processing circuit is further arranged between the buffer circuit and the band-pass filtering circuit and comprises a phase-shift chip U1, a triode VT3, a triode VT2, a resistor R15, a polar capacitor C10 and the like, wherein one end of the resistor R15 is connected with a VCC+ pin of the phase-shift chip U1 while the other end of the resistor R15 is connected with an IN1 pin of the phase-shift chip U1, and a cathode of the polar capacitor C10 is connected with the IN1 pin of the phase-shift chip U1 after passing by a resistor R16 while an anode of the polar capacitor C10 is connected with an IN2 pin of the phase-shift chip U1. The phase-shift processing based band-pass filtering oscillation system has the advantages that by the aid of the phase-shift processing circuit, filtering stability of an oscillation circuit can be improved, and filtering incompleteness of the system due to instable voltage is avoided; meanwhile, an integrated chip LM741 which is high in sensitivity and cheap is adopted.

Description

technical field [0001] The invention relates to an oscillating system, in particular to a band-pass filter dual oscillating system based on a capacitive feedback three-point oscillating circuit. Background technique [0002] With the continuous development of electronic technology, oscillators are used more and more widely as electronic components that generate repetitive electronic signals (usually sine waves or square waves). There are many types, which can be divided into self-excited oscillators and other-excited oscillators according to the oscillation excitation method; can be divided into resistance-capacitance oscillators, inductor-capacitor oscillators, crystal oscillators, tuning fork oscillators, etc. according to the circuit structure; according to the output waveform can be divided into Divided into sine wave, square wave, sawtooth wave and other oscillators. At present, it is widely used in electronic industry, medical treatment, scientific research and so on....

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the defect that the oscillation frequency of the traditional oscillator system is unstable, and to provide a band-pass filter dual oscillation system based on a capacitive feedback three-point oscillation circuit

Images