BJT Amplifiers - Multistage Amplifiers
3 important questions on BJT Amplifiers - Multistage Amplifiers
If the multistage amplifier in Figure 6–58 is driven by a 75 Ω, 50 mV source and the second stage is loaded with an RL = 18 kΩ, determine
(a) voltage gain of each stage
(b) overall voltage gain
(c) Express the gains found in (a) and (b) in dB![]()
Antwoord![]()
Figure 6–59 shows a direct-coupled (that is, with no coupling capacitors between stages) two-stage amplifier. The dc bias of the first stage sets the dc bias of the second. Determine all dc voltages for both stages and the overall ac voltage gain.![]()
Antwoord![]()
Express the following voltage gains in dB:
(a) 12
(b) 50
(c) 100
(d) 2500
(a) 20 log(12) = 21.6 dB
(b) 20 log(50) = 34.0 dB
(c) 20 log(100) = 40.0 dB
(d) 20 log(2500) = 68.0 dB
(b) 20 log(50) = 34.0 dB
(c) 20 log(100) = 40.0 dB
(d) 20 log(2500) = 68.0 dB
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