Field Effect Transistor Amplifiers Flashcards
In a FET, when the negative Vgg bias is decreased, what is the effect on source to drain current flow?
The PN junction barrier increases, increasing Id.
The PN junction barrier increases, decreasing Id.
The PN junction barrier decreases, increasing Id.
The PN junction barrier decreases, decreasing Id.
The PN junction barrier decreases, increasing Id.
What is the unit of measure for gm?
Volt
Amp
Ohm
Mho
Mho
If a FET has a gm of 6 mmhos, what is the change in output current for a 1.5 volt change in input voltage?
9 A
4 A
9 mA
4 mA
9 mA
In a FET, transconductance (gm) is the amount of control that the _______.
input voltage has over the output voltage
input current has over the output voltage
input voltage has over the output current
input current has over the output current
input voltage has over the output current
Which schematic symbol is a FET?
The calculated voltage gain of this common source FET amplifier is _______.
2
8
12
32
32
In this common source FET amplifier, a positive going input signal causes the output signal to be _______.
negative going
positive going
pulsating DC
DC
negative going
In what type of configuration is this FET amplifier?
Common source
Common drain
Common gate
Common anode
Common gate
To check normal operation of this unloaded FET amplifier circuit, you would compare the measured _______.
voltage gain with gm
current gain with gm
voltage gain with gm x R4
voltage gain with gm x R6
voltage gain with gm x R4
Assuming a gm of 4.2 mmhos, the voltage gain in this FET amplifier circuit is _______.
20.9
16.4
4.2
1
16.4
What type of signal is present on Q1’s source with a 10 kHz, 0.1 volt input signal applied to TP3?
10 kHz
Positive DC bias
An inverted 10 kHz signal
Negative DC bias
Positive DC bias
