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Unformatted text preview: University of California, Berkeley Fall 2011 EECS 142 Prof. A. Niknejad Problem Set 3 Due Thursday September 22, 2011 1. Consider an ancient AM receiver architecture consisting of a cascade of tuned amplifiers followed by a diode envelope detector. In a real system, variable gain at RF and IF is needed to avoid clipping and to provide volume control. Suppose that the radio is designed to operate from 520 kHz to 1610 kHz (with 10 kHz channel spacing). Assume an antenna impedance of 50 and a load resistance (speaker) of 10. (a) Design the AM detector to follow a speech signal with up to 10 kHz bandwidth. Size R and C appropriately. (b) If the cascade of amplifiers is realized as a cascade of common source stages, find the maximum obtainable gain per stage in terms of the transistor f T , Q , and the ratio of C gd /C gs . For simplicity, ignore C d ( s,b ) . (c) If the cascade of amplifiers is realized as a cascade of cascode stages, find the maximum obtainable gain per stage in terms of the transistor...
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This note was uploaded on 01/12/2012 for the course EECS 142 taught by Professor Ee142 during the Fall '04 term at University of California, Berkeley.
- Fall '04