Three matched amplifiers are available to amplity a low-level signal. They have the following characteristics: AMPLIFIER GAIN NF 20 1.5 12 dB 6 đB 20 dB The amplifiers are to be connected in cascade. Calculate the lowest overall noise factor obtainable, noting the order in which the amplifiers must be A B 4.0 connected. a1.799, BAC b.1.799, BCA с 2269, ВАС d2 269, BCA

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Three matched amplifiers are
available to amplity a low-level
signal. They have the following
characteristics:
AMPLIFIER GAIN
NF
20
1.5
12 dB
6 đB
20 dB
The amplifiers are to be connected in
cascade. Calculate the lowest overall
noise factor obtainable, noting the order
in which the amplifiers must be
A
B
4.0
connected.
a1.799, BAC
b.1.799, BCA
с 2269, ВАС
d2 269, BCA
Transcribed Image Text:Three matched amplifiers are available to amplity a low-level signal. They have the following characteristics: AMPLIFIER GAIN NF 20 1.5 12 dB 6 đB 20 dB The amplifiers are to be connected in cascade. Calculate the lowest overall noise factor obtainable, noting the order in which the amplifiers must be A B 4.0 connected. a1.799, BAC b.1.799, BCA с 2269, ВАС d2 269, BCA
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