Design of Common Modulation Signal Generator Based on Single-Chip Microcomputer

The common modulation signal generator is mainly composed of STC12C5A60S2 SCM (single-chip microcomputer), DAC0832 chip and their peripheral circuits. Controlled by the SCM, the required analog current is produced by DAC0832, then the current is converted a-5V~5V voltage by the amplifier OP07. Through the control of the switches, the triangle, square, sine and pulse waves can be outputted from generator. Among which, the amplitude of triangle and square and sine waves can be adjusted. The width of square wave and the pulse can be adjusted. Many modulation cases can be showed on the LCD screen. It is proved that the design on the generator is reasonable, the generator performance is stable and reliable, its structure is simple, and its function is high versatility. Admittedly, the designing on modulation signal generator accords with requirement.