简易波形发生器的设计有大图(2)

简易波形

Abstract

Waveform generator is along with the progress of computer technology and microelectronics technology application in measuring instrument and the formation and development of a new type of source. Produce any waveform synthesis based on the number of usually is needed, will produce A periodic signal waveform several samples of the amplitude of the binary information stored in memory, again through the waveform hardware circuit from waveform in memory read out by D/A transformation, after the output signal waveform required.

This system is based on single-chip digital frequency AT89C52 signal generator. By AT89C52 single chip microcomputer as control core, microcontroller AT89C52 DAC0832 and analog-to-digital conversion device for different signal frequency signal, the signal amplitude and frequency can be controlled according to the requirements. Peripheral USES digital circuit simulation/ (DAC0832), amplifier (LM324), buttons and eight digital pipe, etc. Through the button control can produce sawtooth wave, triangular, square, while using sine wave, four different color leds indicate the corresponding waveform. Design is briefly introduced the structure DAC0832 digital-to-analog converters principle and usage, the basic theory of AT89C52 and circuit design relevant chip. This paper mainly introduces how to use the single-chip microcomputer control D/A signal converter produces the hardware circuit and software programming. The design is simple and optimum performance is good, can be used in various needs of low frequency signal, has certain practical.

The design of different frequency signals about the design scheme of the source, not only in theory and in practice can satisfy the requirements, and the experiment with strong feasibility. The waveform generator features are: small, cheap, stable performance, convenient, complete function.

Keywords：waveform；Amplitude；Frequency；AT89C52

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