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Sine-wave generator with high precise frequency

A sine wave generator, high-precision technology, applied in the electrical field, can solve problems such as complex circuits, and achieve the effects of simple circuits, convenient implementation and stable frequency

Inactive Publication Date: 2006-10-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Sine-wave generator with high precise frequency
  • Sine-wave generator with high precise frequency
  • Sine-wave generator with high precise frequency

Examples

Experimental program
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Effect test

Embodiment Construction

[0010] Control attached figure 1 , a high-precision frequency sine wave generator, its structure is composed of an integrated band-pass switched capacitor filter 1, an operational amplifier composed of a negative feedback circuit 2, an external adjustable clock or crystal oscillator circuit 3, and an integrated band-pass switch The first input terminal in the capacitor filter 1 is connected to an external adjustable clock or the output terminal of the crystal oscillator circuit 3, and the second input terminal in the integrated bandpass switched capacitor filter 1 is connected to an operational amplifier to form the output terminal of the negative feedback circuit 2 , the output terminal of the integrated bandpass switched capacitor filter 1 is connected to an operational amplifier to form the input terminal of the negative feedback circuit 2 .

[0011] Make U through the active negative feedback amplifier circuit 2 f with U 0 The phase is opposite, by adjusting the size of ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B25/00
Inventor 刘闯冯雷
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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