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# hw8 - University of California Berkeley EECS 142/242M Fall...

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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 Π attenuator. (a) Find the values of R s and R p to realize an attenuation of 10 dB Z 0 = 50Ω. (b) Find the noise figure of the attenuator when it’s driven and loaded by a Z 0 = 50Ω 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 de-embed the effects of the input cable, which has an attenuation of 3-dB. 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. What’s the noise figure of the amplifier?

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3. Consider the common gate amplifier (the same as in the midterm). The inductor at the output provides bias and also resonates with C db at frequency f o . (a) Assuming in this technology C
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