Background: With the development of integrated circuits

the high-precision signal generator is always used in the process of simulation

testing

inspection and maintenance of electronic equipment in modern physics. The traditional signal generator generates signal by using oscillator

but the precision of oscillator is not high enough which becomes a bottleneck limiting the scope of application. Purpose: The aim is to address the needs of high-precision of signal generator

and design a programmable high-resolution signal generator. Methods: The direct digital frequency synthesizer technique and Sigma-Delta Digital to Analog Converter (DAC) were adopted to design this proposed high-precision signal generator. Digital chips CS5376 and CS4373 were employed together with the CompactRIO DAC to achieve the target of 110 dB signal-to-Noise Ratio (SNR) and ?110 dB Total Harmonic Distortion (THD). Programmable waveform was prepared in the mainframe using appropriate software platform such as Matlab

LabVIEW

etc. Results: After the actual measurement

the designed signal generator is proved to be with the noise ratio of SNR better than 110dB

and the total harmonic distortion THD less than ?110dB

and performs excellent in portability and stability. Conclusion: The performance of signal generator meets the need of our testing. Abstract