In a communication system, the receiver is regarded as a cascade of three series two-port networks as shown in the figure below, and the noise bandwidth is 200 kHz, estimate the signal-to-noise ratio at the input and output of the receiver. (Take Tin=290 K, k = 1.379 x 10-23 W LHz. K Tin RECEIVER Input Preamplifier F G₁ Mixer F₂ G₂ IF Amplifier F3 G3 Output F = 3 dB F₁ = 6 dB F3 = 10 dB G₁ = 4.3 dB G₂ = 15.7 dB G₁ = 10 dB
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