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Unformatted text preview: 1. Consider the following circuit. The passive filter is assumed noiseless. An R L is connected to the output but R L is assumed noiseless in the computation of the system noise figure. Compute the noise figure of the cascade connection. 2. Consider the following receiver chain. All filters are assumed to be noiseless. For each block, either power gain or voltage gain is marked. The amplifiers have matched input and output impedance and therefore their power gains are equal to their corresponding voltage gains in dB’s. The mixer’s power gain and voltage gain are different and are marked separately. The output is connected to a matched network but its noise contribution is already included in the noise figure of the amplifier. The noise introduced by the local oscillator is already included in the noise figure of the mixer. Compute the noise figure from nodes F, E, D, C, B, and A to G; compute the voltage gain from A to B, C, D, E, F, and G; and compute the power gain from A to B, C, D, E, F, and G. 3. In this problem we deal with the nonlinearity of the front-end of the receiver. The 3....
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This document was uploaded on 02/01/2012.
- Spring '09