Optimizing the Number of Channels in Time-interleaved SAR ADCs

Time-interleaving is an effective approach to implement a high sample rate analog to digital converter (ADC) with relatively low-speed ADCs operating at interleaved sampling times. In this paper, an analysis for determining the optimum number of channels in TI-SAR ADCs has been presented. Principally, the effect of increasing the number of channels (m) on two main design aspects, which are power consumption of the whole TI-SAR ADC and the amount of signal to noise and distortion ratio (SNDR) has been verified. Explicit formulas for the power consumption of the TI-SAR ADC and the SNDR as a function of channel mismatch effects have been derived. Based on these aspects, a figure-of-merit (FOM) is defined by minimizing which, the optimum number of channels is determined for a given resolution and sample rate. Matlab simulations verifies the effectiveness of the proposed design methodology.

کلیدواژه ها:

Design methodology ، time-interleaved ADCs ، SAR ADC ، power consumption ، interleaving mismatch errors