Programmable controlled sine wave generating circuit

Abstract

The invention discloses a programmable controlled sine wave generating circuit. The circuit comprises a CPU, an oscillation module and a comparator U2; an output end of the oscillation module is inputted into the CPU after being compared by the comparator; and the CPU is used for comparing the frequency of a measured outputted sine wave signal with a set frequency value, and adjusting a first variable resistor R1 and a second variable resistor R2, so that the frequency of the outputted sine wave signal tends to the set value constantly. The programmable controlled sine wave generating circuit provided by the invention can accurately control a high frequency signal generation circuit through the CPU, output a set signal after setting the frequency and amplitude at random, and can detect the frequency and amplitude in a closed-loop way and compare the frequency and amplitude with the set value to perform fine adjustment on an output signal error, so as to generate a sinusoidal signal with accurate and stable frequency and amplitude.

Description

technical field [0001] The invention belongs to the field of signal generators, and in particular relates to a programmable control high-stability and amplitude-stabilized sine wave generating circuit, which can be used for signal amplitude modulation and frequency modulation in broadcasting, television, communication fields, industrial automatic control, measuring instruments, high Frequency heating and ultrasonic flaw detection, etc. Background technique [0002] In the prior art, high-frequency signal generation circuits abound, some of which directly control the signal generation chip to generate signals, but this kind of circuit has a low frequency band and cannot control the amplitude; it also uses the principle of frequency mixing to generate high-frequency signals, but the mixing There are a large number of harmonics in the post-frequency signal, which brings great difficulty to the subsequent filtering process; there are also high-frequency signals generated by an o...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, high-frequency signal generation circuits abound, some of which directly control the signal generation chip to generate signals, but this kind of circuit has a low frequency band and cannot control the amplitude; it also uses the principle of frequency mixing to generate high-frequency signals, but the mixing There are a large number of harmonics in the post-frequency signal, which brings great difficulty to the subsequent filtering process; there are also high-frequency signals generated by an oscillating circuit, but this circuit can only generate a signal with a fixed frequency and amplitude. The amplitude cannot be controlled, and the frequency and amplitude can only be adjusted manually, which cannot improve the stability of the signal frequency and amplitude

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