Design of Low Power, High Speed Fine Grain and Coarse Grain Double Tail Comparator

Abstract

Comparator is a fundamental building block in ADCs. Comparator is a device that compares two voltages or currents and gives a digital output that indicates which of the input is larger. In design of ADCs, comparators of low power consumption, high speed are used. In high speed analog to digital converters, comparator design has a crucial influence on the overall performance that can be achieved.

In this paper, we have proposed a new low power, high speed single tail and double tail comparators using power gating techniques. The comparison of speed and power consumed by proposed fine grain and coarse grain double tail comparators with traditional comparators like single tail and double tail comparators is also presented.

We observed that minimal propagation time delay and low power consumption is achieved by the proposed fine grain double tail comparators which make them suitable for high speed ADCs.

Index Terms–Course Grain Double tail comparator, Fine Grain single tail comparator, Fine Grain Double tail comparator, dynamic clocked comparator, high speed analog to digital converters, low power analog design, switching transistor , preamplifier based comparators.