A low noise 3 stage cascaded power amplifier is to be used in a typical low noise communication receiver. The specifications of the three stages are given below: Amplifier -1: Gain G1 =30 dB ; Bandwidth = 1 kHz ; Total output Noise Power = - 141 dBW Amplifier -2 : Gain G2 = 20 dB ; Noise ratio (F2) = 2.547 Amplifier -3: Gain G3 = 12 dB ; Equivalent Noise Temperature (Te3)= 300 deg K. Assume that all amplifiers are kept at the same reference temperature = 27 deg C. Calculate (i) Noise ratio (F1) for Amplifier -1 (ii) Equivalent Noise Temperature Te2 (in deg K) for Amplifier -2 ( iii) Noise Ratio (F3) for Amplifier -3. (iv)Find the overall Noise Ratio after connecting the 3 stages in proper order. Toted (Note : All answers should be approximated to 3 decimal places before entering them in the boxes) Noise ratio (F1) for Amplifier -1 Equivalent Noise Temperature (Te2) for Amplifier -2 in deg K Noise Ratio (F3) for Amplifier -3. T Overall Noise Ratio after connecting the 3 stages in proper order.

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3
A low noise 3 stage cascaded power amplifier is
to be used in a typical low noise communication
receiver. The specifications of the three stages
are given below:
Amplifier -1: Gain G1 =30 dB ; Bandwidth = 1
kHz ;
Total output Noise Power = - 141 dBW
Amplifier -2 : Gain G2 = 20 dB ; Noise ratio (F2)
= 2.547
Amplifier -3: Gain G3 = 12 dB ; Equivalent Noise
Temperature (Te3)= 300 deg K.
Assume that all amplifiers are kept at the same
reference temperature = 27 deg C.
Calculate (i) Noise ratio (F1) for Amplifier -1
(ii) Equivalent Noise Temperature Te2 (in deg
K) for Amplifier -2
( iii) Noise Ratio (F3) for Amplifier -3. (C
(iv)Find the overall Noise Ratio after connecting
the 3 stages in proper order.
Toted
(Note : All answers should be approximated to 3
decimal places before entering them in the boxes)
Noise ratio (F1) for Amplifier -1 An
Equivalent Noise Temperature (Te2) for Amplifier
-2 in deg K (
Noise Ratio (F3) for Amplifier -3. -
Overall Noise Ratio after connecting the 3 stages
in proper order.
Transcribed Image Text:A low noise 3 stage cascaded power amplifier is to be used in a typical low noise communication receiver. The specifications of the three stages are given below: Amplifier -1: Gain G1 =30 dB ; Bandwidth = 1 kHz ; Total output Noise Power = - 141 dBW Amplifier -2 : Gain G2 = 20 dB ; Noise ratio (F2) = 2.547 Amplifier -3: Gain G3 = 12 dB ; Equivalent Noise Temperature (Te3)= 300 deg K. Assume that all amplifiers are kept at the same reference temperature = 27 deg C. Calculate (i) Noise ratio (F1) for Amplifier -1 (ii) Equivalent Noise Temperature Te2 (in deg K) for Amplifier -2 ( iii) Noise Ratio (F3) for Amplifier -3. (C (iv)Find the overall Noise Ratio after connecting the 3 stages in proper order. Toted (Note : All answers should be approximated to 3 decimal places before entering them in the boxes) Noise ratio (F1) for Amplifier -1 An Equivalent Noise Temperature (Te2) for Amplifier -2 in deg K ( Noise Ratio (F3) for Amplifier -3. - Overall Noise Ratio after connecting the 3 stages in proper order.
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