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DAC_ADC_Module

DAC_ADC_Module - A/D and D/A Converters CMOS Digital...

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A/D and D/A Converters CMOS Digital Integrated Circuits Massoud Pedram Spring 2007 Dept. of Electrical Engineering – Systems University of Southern California
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Motivation Digital systems are widely used for control, i ti t i t t ti t communication, computers, instrumentation, etc. In many such applications of digital systems, signal is not available in digital form Need for converting an analog signal to digital form A digital communication system is used to transmit messages which are in the form of analog signals. This requires an A/D converter at the transmitting end and D/A converter at the receiving end. M. Pedram USC/EE
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Analog to Digital Conversion The A/D process involves four process: Sampling Holding Quantizing Encoding Sampling and holding operations are done simultaneously in sample and hold circuit sample and hold Quantizing and encoding operations are done simultaneously using analog to digital converter (A/D converter or ADC) M. Pedram USC/EE
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Digital to Analog Converters The input to a D/A converter is an N bit binary signal, available in parallel form: Digital Input Analog Output The analog output voltage of D/A converter is related to the digital input by: 1 2 2 1 0 ... N N b b b b b