1. Assume that a receiver has a first amplifier stage with a 5K W input resistan

Question

1. Assume that a receiver has a first amplifier stage with a 5KW input resistance, a gain of 300, an input audio signal of 20 mV, and an operating temperature of 27oC. When the amplifier is operating with a bandwidth first of 10 MHz,

Find:

(a) the rms input noise levels <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /?>

(b) the audio output levels

(c) the rms output noise levels

2. We have an amplifier with a 1 MHz bandwidth and a 20 mV input signal. The

input noise = 1 mV, output signal = 6.0 mV, and output noise = 1 mV.

Find:

(a) SNR at the input

(b) SNR at the output

(c) Noise figure

Explanation / Answer

SNR(i/p)=10log10(power of input signal/Power of input noise) SNR(o/p)=10log10(power of input signal/Power of (Enhanced signal component-input signal))..

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