Problem 5. Using the same design as Problem 4 an additional amplifier is inserted in the system before the one described in Problem 4 (a preamplifier) so that now the antenna feeds energy to two networks in cascade. The preamp has a noise figure of 3 dB and a gain of 13 dB and a bandwidth of 10 MHz. Find Ts, Fout, Nout and SNRout, where Fout is the overall or composite F.
Problem 5. Using the same design as Problem 4 an additional amplifier is inserted in the system before the one described in Problem 4 (a preamplifier) so that now the antenna feeds energy to two networks in cascade. The preamp has a noise figure of 3 dB and a gain of 13 dB and a bandwidth of 10 MHz. Find Ts, Fout, Nout and SNRout, where Fout is the overall or composite F.
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Author:Robert L. Boylestad
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Transcribed Image Text:Problem 4.
A receiver front end has a noise figure of 9 dB and
a gain of 50 dB and a bandwidth of 10 MHz. The input signal power is
10-11 W. The antenna temperature is 180° K. Find Te, Ts, Nout, SNRin
and SNRout. You may use To = 290° K and Boltzmann's constant equals
1.38 x 10-23
J/K.
Transcribed Image Text:Problem 5.
Using the same design as Problem 4 an additional
amplifier is inserted in the system before the one described in Problem 4
(a preamplifier) so that now the antenna feeds energy to two networks in
cascade. The preamp has a noise figure of 3 dB and a gain of 13 dB and a
bandwidth of 10 MHz. Find Ts, Fout, Nout and SNRout, where Fout is the
overall or composite F.
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Step 1: The preamp has a noise fig of 3dB and gain of 13dB and a bandwidth of 10MHz
VIEWStep 2: F out using formula, calculate it's noise temperature, calculate the total noise temperature.
VIEWStep 3: Preamplifier has gain 13dB at 200k, calculate F out, calculate the overall output noise power N out
VIEWStep 4: Find signal to noise ratio degradation SNRod.input signal to noise ratio,SNRin.
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