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EE 164 Problem Set 11

EE 164 Problem Set 11 - EE 164 Problem 1 Problem Set 11...

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EE 164 Problem Set 11 Spring 2005 Problem 1: The optic power reaching the receiver is 1 W µ . The detector’s responsivity is 0.5 A W , and its dark current is 4 nA . The temperature is 27 C D , the receiver’s bandwidth is 500 MHz, and the load resistance is 50 . a) Compute the signal-to-noise ratio. b) Compute the thermal-noise-limited SNR. c) Compute the shot-noise-limited SNR. d) What value of photodetector gain is required to make the actually SNR just 5dB less than the quantum limit? Assume that the photodetector has negligible excess noise. Problem 2: Consider a heterodyne receiver for a digital system. The photodetector has 2 nA of dark current and 0.5 A/W of responsivity. The temperature is 27 C D , the load resistance is 100 , the IF bandwidth is 500 MHz, and the received optic signal power is constant at 5 nW when a binary 1 is received. a) How much local-oscillator power is required to make the SNR just 1 dB less than the quantum limit?
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