Design and realization of a digital signal source

This paper introduces the design method of the digital signal generator based on LPC2132 as the main control chip. Using the direct digital frequency synthesis (DDS) chip and programmable logic device (CPLD), the analog signal amplification and gain control circuit is designed. Different signals can be conveniently switched through the keyboard, realizing a new digital signal source with stable waveform, high precision and adjustable amplitude and frequency within the specified range.