Signal generator, it is a widely used source, with the scientific and technological development, increasing its demands. Industrial production and scientific research in the use of signal generator output signal, the performance of components and parameters measured, but also the electrical and electronic products for authentication, and adjust parameters of identification. The signal generator used by the vast majority of analog circuit components, such as analog signal generator for the low-frequency signals often require output value of the RC great, it will not only difficult to ensure the accuracy of parameters, but also have great size and power consumption, Digital components of low-frequency signal generator, although the low-frequency performance good but larger, more expensive price, therefore, high accuracy, wide-AM, will become a low-cost digital signal generator trend of development.
My graduation project core task is to design: 89S52 as the core, unifies DAC0808 to realize the programmed control to have the sine wave, the triangular wave, the square-wave and the saw-tooth wave four kind of commonly used low-frequency signals .Can choose the keyboard-type and frequency of any input, frequency of use of five digital display, two square with the duty cycle of the digital display, with a wave of the digital display.
In addition, I used KEIL and PROTEUS joint simulation, functional works to achieve the purpose of verification, and make an evaluation board.