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This design adopts the AT89552 single chip microcontroller, supplemented by the necessary analog circuit, and realizes a sinusoidal unit generator based on direct digital frequency synthesis technology (DDS). In the design, DDS chip AD9850 was used to generate the sine wave in the range of 1KHZ~ 10MHZ, and the output voltage amplitude was controlled by the amplifier AD811, which was controlled by the single-chip AT89S52 control step frequency 1HZ. On this basis, the analog multiplier of MC1496 is used to realize the analog phase modulation signal frequency of 1KHZ. The FPGA chip is used to generate the binary NRZ code, which is combined with AD9850 to realize phase shift keying PSK, amplitude shift keying ASK, FSK of frequency shift town. -AT89552 the single-chip design, supplemented by the necessary analog circuits, based on the realization of a direct digital frequency synthesis (DDS) generator of sinusoidal No. Friends. The design of DDS chip AD9850 produced using 1KHZ ~ 10MHZ frequency range of sine wave, the AD811 control amplifier output voltage range of from single-chip AT89S52-conditioning step frequency control 1HZ. On this basis, the use of analog multiplier MC1496 has sinusoidal frequency modulation signal 1KHZ degree analog phase modulated signal generated by FPGA chip NRZ binary code, combined with the AD9850 to achieve phase shift keying PSK, ASK ASK, frequency Shift key town of FSK.