Design Of A Kind Of Pipelined Analog To Digital Converter In CMOS 0.18μm Technology

As the technology advances, large volume of circuitry including analogcircuits and digital circuits is included in one chip and it is more and more important ofareas and power consuming. So it is very critical to design a high performance Analogto Digital Converter (ADC) based on standard CMOS technology which is aim of thispaper.ADCs are wide used in wireless communication, imaging process, audio, videotechnology and industrial control, such as integrated sensor systems. Also sensorsproduced a wide range of signal levels. This paper describes a 9-bit floating-pointpipelined ADC. It can be one block of high performance and favorable dynamic-rangeCMOS Sensor. The named ADC was designed to meet a large dynamic range of 78dBand the areas and power consuming are lesser.This paper introduces the principle of floating-point pipelined ADC and provides adesign of 9-bit floating-point pipelined ADC composed of two main blocks which arevariable gain amplifier (VGA) block reaching 3-bit exponent and 6-bit pipelined ADCblock reaching 6-bit mantissa.About this design, every necessary circuit was designed in detail. In chapter 2, aftercomparing several kinds of ADCs, the principle of floating-point pipelined ADC isintroduced. In chapter 3, analogy circuit analogy circuits such as high frequencyOp-Amp, low frequency Op-Amp, VGA, switched capacitor subtracter and comparatorare discussed and designed. In chapter 4, digital circuits such as every basic digitalcircuits, D flip-flop, encoder and clock generator are discussed and designed. In chapter5, 3-bit flash ADC and DAC circuits used in VGA block and pipeline block arediscussed and designed. Finally, in chapter 6, entire floating-point ADC was combinedand tested.The ADC circuit was designed in 0.18μm COMS technology.