Design of low voltage, high speed, medium resolution CMOS comparator in 0.18 um technology

Keywords

Differential amplifiers, Metal oxide semiconductors, Complementary

Abstract

Analog to Digital converters {ADC) are the crucial building blocks of the modem mixed signal integrated circuits, they act as a bridge between the analog world and digital system. The data converters influence the performance and the price of the whole system and the performance of the data converters depends upon the performance of the comparator circuit. Comparator circuit forms the core of the ADC; the design of the comparator circuit has essential effect on the design of the converters. When the ADCs require the comparator circuit ,the first two specifications that define the performance of the comparator are speed and the resolution, while it is true that further specifications will be need to determine the compatibility to the requirement but peed and resolution still are very important.

The objective of the work in this master thesis is to design a suitable comparator for very high speed and reasonable good resolution converter. The circuit is designed in a 0.18 μm CMOS technology. The circuit level design consists of a high bandwidth preamplifier circuit to reduce the offset effect in order to improve the resolution. Improved regenerative circuit which samples signal from the preamplifier at very high sampling speed and at the same time reduces the effect of the metastability. The results are based on circuit level spice simulation in Cadence IC design tools with BSIM 3v3.2 transistor model parameters. Simulation results shows that the comparator circuit achieve sampling speed of 700 MS/s with 1 Om V input precision and 900 MHz comparison rate in a O. l 8μm CMOS technology with a supply voltage of 1.8 V for both analog and digital block.

Notes

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Graduation Date

2004

Degree

Master of Science (M.S.)

College

College of Engineering

Format

PDF

Pages

83 p.

Language

English

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Identifier

DP0029492

Subjects

Dissertations, Academic -- Engineering; Engineering -- Dissertations, Academic

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