Electronic technician exam
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1. An amplifier is a circuit that can increase the BJT amplifiers
peak-to-peak voltage, current, or power of a
signal. The change in the signal is called gain.
2. Gain is the ratio of the signal out put to the The change in signal is called Gain,
signal input both input signal output signals
have the same units, gain has no
units.
3. Voltage Gain or voltage amplification Calcula- Voltage gain AV can be calculated by
tions comparing the output voltage am-
plitude to the input voltage ampli-
tude AV= V - OUT/V- IN
4. Ai=current output/current input Current gain A equals the output
current divided by the value of the
input current
5. Ap = [AV×Ai] Power gain equals voltage gains
times the current gains
6. The input current is 0.5 mApp and the output Figure 26-1 the input voltage is 50
current is 10 mApp. mVPP The output voltage of the am-
plifier is 1.2 Vpp.
7. voltage gain the voltage gain is:
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8. solve input signal to amplifier is 4 mVpp
output signal is 1 Vpp what is the
voltage gain?
9. solve input current amplitude is 0.03mA
output current amplitude is 1.5mA
what is the current gain?
10. solve Amplifier has a voltage gain of 60
current gain of 30 what is power
gain?
11. larger than the base current this is due to the the collector current of a bipolar
transistor's current gain (B) junction transistors is:
12. the transistor must be biased For transistor to function as an am-
plifier...
13. if vbb> 0.7v then vbe =0.7v and the transistor Figure 26-2 schematic for the fixed
is operating in either linear or saturation re- base biasing circuit. To determine
gions calculate base current (Ib=(vbb-vbe)/Rb if the Q point of this circuit, you
transistor is in linear region calculate collector must first evaluate the base-emit-
current with dc current gain (B) of the transistor ter loop. Writing: (Kirchhoff's volt-
( Ic= B×Ib age law) around the closed loop,
you get: VBB - IB X RB-VBE = 0
, Electronic technician exam
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14. Transistor Biasing Circuit The biasing circuit determines the
dc operating point for the transistor.
The bias circuit is composed of the
dc power source(s), the transistor,
and resistors. The dc voltages and
currents in the circuit establish the
dc operating point.
15. quiescent point or Q point the dc operating point is also
knowns as..
16. establishes which dc voltage or current amplifi- the Q point
cation will take place for the transistor at:
17. common emitter common base common col- there are 3 basic configurations for
lector BJT amplifiers
18. common emitter input signal is between base Amplifier Figure 26-6 shows the
and ground the output signal is between collec- common-emitter amplifier, most
tor and ground commonly used BJt the input signal
is applied between the, base termi-
nal and ground the output signal
is taken between the collector and
ground
, Electronic technician exam
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19. CE amplifier input signal is at the base the out- common emitter circuit medium in-
put is from the collector the emitter is connect- put impedance output signal has
ed to ground through the emitter bypass medium impedance power gain
high
180 phase reversal between input
and output signals
20. Common collector cc amplifier Amplifier Figure 26-12 is a schemat-
ic of an Common collector, configu-
ration has the input signal applied
to the base and output taken from
emitter terminal.
21. CC emitter follower unity gain analog buffer the collector terminal is common to
both the input and output. This cir-
cuit configuration is called the com-
mon-collector, It is also known as an
emitter follower and unity gain ana-
log buffer.
Study online at https://quizlet.com/_alpjys
1. An amplifier is a circuit that can increase the BJT amplifiers
peak-to-peak voltage, current, or power of a
signal. The change in the signal is called gain.
2. Gain is the ratio of the signal out put to the The change in signal is called Gain,
signal input both input signal output signals
have the same units, gain has no
units.
3. Voltage Gain or voltage amplification Calcula- Voltage gain AV can be calculated by
tions comparing the output voltage am-
plitude to the input voltage ampli-
tude AV= V - OUT/V- IN
4. Ai=current output/current input Current gain A equals the output
current divided by the value of the
input current
5. Ap = [AV×Ai] Power gain equals voltage gains
times the current gains
6. The input current is 0.5 mApp and the output Figure 26-1 the input voltage is 50
current is 10 mApp. mVPP The output voltage of the am-
plifier is 1.2 Vpp.
7. voltage gain the voltage gain is:
, Electronic technician exam
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8. solve input signal to amplifier is 4 mVpp
output signal is 1 Vpp what is the
voltage gain?
9. solve input current amplitude is 0.03mA
output current amplitude is 1.5mA
what is the current gain?
10. solve Amplifier has a voltage gain of 60
current gain of 30 what is power
gain?
11. larger than the base current this is due to the the collector current of a bipolar
transistor's current gain (B) junction transistors is:
12. the transistor must be biased For transistor to function as an am-
plifier...
13. if vbb> 0.7v then vbe =0.7v and the transistor Figure 26-2 schematic for the fixed
is operating in either linear or saturation re- base biasing circuit. To determine
gions calculate base current (Ib=(vbb-vbe)/Rb if the Q point of this circuit, you
transistor is in linear region calculate collector must first evaluate the base-emit-
current with dc current gain (B) of the transistor ter loop. Writing: (Kirchhoff's volt-
( Ic= B×Ib age law) around the closed loop,
you get: VBB - IB X RB-VBE = 0
, Electronic technician exam
Study online at https://quizlet.com/_alpjys
14. Transistor Biasing Circuit The biasing circuit determines the
dc operating point for the transistor.
The bias circuit is composed of the
dc power source(s), the transistor,
and resistors. The dc voltages and
currents in the circuit establish the
dc operating point.
15. quiescent point or Q point the dc operating point is also
knowns as..
16. establishes which dc voltage or current amplifi- the Q point
cation will take place for the transistor at:
17. common emitter common base common col- there are 3 basic configurations for
lector BJT amplifiers
18. common emitter input signal is between base Amplifier Figure 26-6 shows the
and ground the output signal is between collec- common-emitter amplifier, most
tor and ground commonly used BJt the input signal
is applied between the, base termi-
nal and ground the output signal
is taken between the collector and
ground
, Electronic technician exam
Study online at https://quizlet.com/_alpjys
19. CE amplifier input signal is at the base the out- common emitter circuit medium in-
put is from the collector the emitter is connect- put impedance output signal has
ed to ground through the emitter bypass medium impedance power gain
high
180 phase reversal between input
and output signals
20. Common collector cc amplifier Amplifier Figure 26-12 is a schemat-
ic of an Common collector, configu-
ration has the input signal applied
to the base and output taken from
emitter terminal.
21. CC emitter follower unity gain analog buffer the collector terminal is common to
both the input and output. This cir-
cuit configuration is called the com-
mon-collector, It is also known as an
emitter follower and unity gain ana-
log buffer.
