Sine-wave generator with high precise frequency

Abstract

This invention relates to a sine wave generator based on a general switch capacitance filter integrated chip, which utilizes an integrated band-pass switch capacitance filter, an outside adjustable clock or a crystal oscillator and an operation amplifier to compose a negative feed back circuit, in which, the clock circuit provides a clock signal of constant frequency to the switch capacitance band-pass filter, the output of which is connected with the input of the negative feed back circuit then to be cut in the input of the filter, which does not need any separated elements of capacitors or inductors to compose a sine-wave generator with accurate output frequency and high quality.

Description

technical field [0001] The invention relates to a high-precision frequency sine wave generator based on a switched capacitor filter. It belongs to the field of electrical technology. Background technique: [0002] Sine wave oscillation circuits are widely used in communication, broadcasting, television and other systems, such as carrier generation circuits in radio communication transmitters, local oscillation circuits in superheterodyne receivers, etc. For decades, among the oscillators that generate sine waves, LC oscillators and RC oscillators or active filter oscillators are the most widely used. Due to the existence of inductors or capacitors and many discrete components in these oscillators, the circuit is more complicated, and the parameters of these discrete components will inevitably drift with time, temperature, etc. stable applications. Invention content: [0003] The object of the present invention is to propose a high-precision frequency sine wave generator...

AI Technical Summary

Problems solved by technology

It can effectively overcome the complex circuit in the existing technology, and the parameters of discrete devices will drift with time, temperature, etc.

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