Implementation of Stacked-CMOS Inverter based TIQ Comparator for FADC.

Abstract

A Threshold Inverter Quantizer (TIQ) is suggested in this paper for implementing a 3-bit, 1.2V Flash Analog to Digital Converter (FADC). A Stacked-CMOS Inverter based Threshold Inverter Quantizer (TIQ) is used for implementation of Comparator section in the Flash ADC; the comparator operates on different reference voltages, which is achieved by systematic variation of W/L ratio of each stacked CMOS TIQ comparator. Proposed design is simulated on Empyrean EDA tool with SMIC 65nm Technology. The power dissipation of ADC simulated at 1.2V Vdd for 1fF capacitive load over input frequency range of 1 Hz to 1 MHz is observed as 5.98µW; which is about 70 % lesser than that of conventional CMOS TIQ based Flash ADC.