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Unformatted text preview: University of California, Berkeley Fall 2011 EECS 142/242M Prof. A. Niknejad Problem Set 8 Due Thursday November 10, 2011 R 2 R 1 R 1 1. Consider a attenuator. (a) Find the values of R s and R p to realize an attenuation of 10 dB Z = 50. (b) Find the noise figure of the attenuator when its driven and loaded by a Z = 50 resistor using circuit analysis. (c) Repeat the calculation using system level considerations. LNA Spectrum Analyzer Signal Source 2. Suppose that you wish to measure the noise figure of an amplifier. We need to deembed the effects of the input cable, which has an attenuation of 3dB. Using a spectrum analyzer, you measure the output noise power to be 71 dBm/MHz. When a small input signal is excited from the input, you find the overall gain (attenuator plus amplifier) to be 33 dB. Whats the noise figure of the amplifier? 3. Consider the common gate amplifier (the same as in the midterm)....
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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
 ee142

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