Sampling Rate Enhancement for SAR-ADCs Using Adaptive Reset Approach for FOG Systems

In this investigation, an adaptive reset strategy of a 10-bit SAR-ADC particularly designed for the applications in FOG (fiber optic gyroscope) systems is demonstrated with TSMC 40 nm CMOS technology. The proposed adaptive reset approach takes advantage of high correlation of the phase shift generated by continuous FOG signals such that MSB bits of two consecutive samples likely remain the same, which implies there is no need to re-converted. By replacing conventional all-reset method with the adaptive-reset strategy, the throughput of the SAR ADC is theoretically increased up to around 100%. The sampling rate is increased by 2 times compared with the conventional counterpart.