Scientific Research Publishing
Comparator is widely used in the process of converting analog signals to digital signals. In the A/D conversion process, it is necessary to first sample the input. In this paper, the authors present an improved method for design of CMOS comparator based on a preamplifier-latch circuit driven by a clock. Design is intended to be implemented in sigma-delta Analog-to-Digital Converter (ADC). The main advantage of this design is capable to reduce power dissipation and increase speed of an ADC. The design is simulated in 0.18 um CMOS technology with Cadence environment.