The DDS, Direct Digital Synthesizer, which is implemented by a unique FPGA IC, can provide the stable sine signal with digital AM, FM, ASK, PSK modulation.

• 仅用单片FPGA就实现了直接数字频率合成技术（DDS），产生稳幅正弦波，并在数字域实现了AM、FM、ASK、PSK等四类调制信号。