A high-resolution time-interleaved delta-sigma modulator with low oversampling

This paper proposes a new two-channel time-interleaved delta-sigma modulator (DSM). The time-interleaved approach can reduce four times of sampling rate as compared with the conventional delta-sigma modulator and the performance is much better. This technique can relax the limitation of high-gain and high-speed requirements of opamps in the DSM design and thus it can reduce the design complexity and power consumption significantly. Consequently, this proposed DSM architecture can provide a low power and high-resolution performance for the audio band applications. The simulation results indicate that this interleaved DSM has a dynamic range of 110 dB with 3.2 MHz sampling rate in 25 kHz signal bandwidth.