A Novel Design Method of Time-Interleaved Subranging ADC

Abstract:- A novel design method of time-interleaved subranging ADC is presented. We use the bisection method to let only half of the comparators in typical subranging ADC to work in every clock cycle. Thus, we are able to reduce the number of comparators by half. It is possible to reduce the die size. An example of a 8-bit time-interleaved subranging ADC operates at 40MHz sampling rate and 1.8V supply voltage is demonstrated. The power consumption of the proposed circuit is only 10mV with SPECTRE simulation. The physizical measurement of the Time-Interleaved Subranging ADC and the ordinary Subranging ADC is compared using layout. It is shown that the bisection method is able to reduce up to 40 % in die size