Optimize the Buffer Amplifier / ADC Connection

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  • Author: Joe Dipilato, Dan Terlep and Tanja Hofner
Communications systems designers have long envi-sioned the “ideal” digital receiver signal-process-ing chain as consisting of an antenna, filter, low-noise amplifier (LNA), and analog-to-digital con-verter (ADC) followed by digital demodulation and signal processing circuitry. Although this ideal digital receiver may still be several years away, communications receivers have steadily eliminated stages of frequency conversion while placing greater importance on the ADC in the front-end architecture. Although some receiver stages have been eliminated, the buffer amplifier stage that precedes the ADC remains an important component in a wide range of receivers and can play a major role in the performance achieved by the ADC.