Note that all capacitors are large so that their impedance is negligible at signal frequencies of interest. npn equations active Ic Ise VBE/VT = IB = (Is/B)eVB VBE/VT IE = (Is/α)еVB VBE/VT Ic=ẞIB_IС = αIE B α α = B = B+1 1-α Ic α Im Υπ re To= VT 9m Im 550 VA 2. BJT amplifier The transistor in the circuit below has ẞ 50 and VBE Early effect and use VT = 25 mV. Vsig 5 V 140 k WWW 1 k + 5 V w - Vout = 0.8 V in forward bias. Ignore the a) Is this amplifier a common-emitter, common-base, or common-collector configuration? Determine the collector current and show that the transistor is biased in the active mode. b) Calculate the amplifier's small-signal gain A, the input resistance Rin, and the output resistance Rout. Note that the 140 k biasing resistor has an effect on Rin

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Note that all capacitors are large so that their impedance is negligible at signal frequencies
of interest.
npn equations
active Ic Ise
VBE/VT
=
IB = (Is/B)eVB
VBE/VT
IE = (Is/α)еVB
VBE/VT
Ic=ẞIB_IС = αIE
B
α
α =
B =
B+1
1-α
Ic
α
Im
Υπ
re
To=
VT
9m
Im
550
VA
Transcribed Image Text:Note that all capacitors are large so that their impedance is negligible at signal frequencies of interest. npn equations active Ic Ise VBE/VT = IB = (Is/B)eVB VBE/VT IE = (Is/α)еVB VBE/VT Ic=ẞIB_IС = αIE B α α = B = B+1 1-α Ic α Im Υπ re To= VT 9m Im 550 VA
2. BJT amplifier
The transistor in the circuit below has ẞ 50 and VBE
Early effect and use VT = 25 mV.
Vsig
5 V
140 k
WWW
1 k
+ 5 V
w
- Vout
= 0.8 V in forward bias. Ignore the
a) Is this amplifier a common-emitter, common-base, or common-collector configuration?
Determine the collector current and show that the transistor is biased in the active mode.
b) Calculate the amplifier's small-signal gain A, the input resistance Rin, and the output
resistance Rout. Note that the 140 k biasing resistor has an effect on Rin
Transcribed Image Text:2. BJT amplifier The transistor in the circuit below has ẞ 50 and VBE Early effect and use VT = 25 mV. Vsig 5 V 140 k WWW 1 k + 5 V w - Vout = 0.8 V in forward bias. Ignore the a) Is this amplifier a common-emitter, common-base, or common-collector configuration? Determine the collector current and show that the transistor is biased in the active mode. b) Calculate the amplifier's small-signal gain A, the input resistance Rin, and the output resistance Rout. Note that the 140 k biasing resistor has an effect on Rin
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