WorksheetsQuiz on Module 1
Total questions: 15
Worksheet time: 55mins
Which of the following is the correct relationship between base and emitter current of a BJT?
IB = β IE
IB = IE
IB = (β + 1) IE
IE = (β + 1) IB
For best operation of a BJT, which region must the operating point be set at?
Active region
Cutoff region
Saturation region
Reverse active region
BJT is biased to _________
Work as a switch
Prevent thermal runaway
Increase DC collector current
Operate it in the saturation region
The biasing circuit that gives best stability to Q point is
base resistance biasing
feedback resistor biasing
potential divider biasing
emitter resistor biasing
The potential divider biasing is used in amplifiers to
limit the input ac signal going to the base
reduce dc base current
reduce the cost of the circuit by limiting the number of resistors
make the operating point almost independent of β
A transistor with ß = 120 is biased to operate at a dc collector current of 1.2 mA. Find the value of gm.
12mA/V
24 mA/V
36 mA/V
48 mA/V
A transistor operating with nominal gm of 60 mA/V has a ß that ranges from 50 to 200. Also, the bias circuit, being less than ideal, allows a 20% variation in Ic. What is the smallest value found of the resistance looking into the base?
347 ohm
694 ohm
1041 ohm
1388 ohm
A designer wishes to create a BJT amplifier with a gm of 50 mA/V and a base input resistance of 2000 O or more. What is the minimum ß he can tolerate for the transistor used?
100
150
200
250
The SI units of transconductance is
Ampere/ volt
Volt/ ampere
Ohm
Siemens
Consider the following circuit. Process transconductance parameter = 0.50 mA/V2, W/L=1, Threshold voltage = 3V, VDD = 20V. Find the operating point of circuit.
20V, 25mA
13V, 22mA
12.72V, 23.61mA
20V, 23.61mA
For a MOSFET, the pinch-off voltage is -3V. Gate to source voltage is 20V. W/L ratio is 5. Process transconductance parameter is 40μA/V2. Find drain to source current in saturation.
0.10 mA
0.05mA
– 0.05mA
– 50A
Find the gate voltage for voltage divider having R1=R2=1KΩ and VDD=5V?
1V
5V
3V
2.5V
What is trans-conductance?
Ratio of change in drain current to change in collector current
Ratio of change in drain current to change in gate to source voltage
Ratio of change in collector current to change in drain current
Ratio of change in collector current to change in gate to source voltage
For a FET, graph is drawn by taking voltage VGS in X axis and drain current in Y axis, if the value of X changes from 10 to 20 results in change in value of Y axis from 2 to 3. What is the value of trans conductance?
1
2
0.1
0.01
In a small signal equivalent model of an FET, What does gm VGS stand for?
A pure resistor
Voltage controlled current source
Current controlled current source
Voltage controlled voltage source
