Abstract: With reference to the built-in-self-test(BIST) of analog-mixed signal AD converters, on-chip sine stimulus based on sigma-delta modulated techniques was studied. The research was mainly focused on the software implementation. By designing Sigma-Delta modulator, and analyzing the attributes of output bitstreams, we provided a scheme for shortest bitstreams selection and their optimization. In this paper, a 12-bit ADC was chosen to be tested. The output bitstreams with the required signal-to-noise ratio(SNR) were generated, which verifies the feasibility of the method.