GATE Electrical – Analog Electronics
Practice Problems – Page 9
This section includes numerical problems based on Differential Amplifier Gain, Output Voltage and CMRR.
Problem 81
Question:
A differential amplifier has differential gain Ad = 150. If V1 = 20 mV and V2 = 5 mV, find output voltage.
Solution:
Vd = V1 − V2
Vd = 20 mV − 5 mV
Vd = 15 mV
Vo = Ad × Vd
Vo = 150 × 15 mV = 2.25 V
Problem 82
Question:
If common mode gain Ac = 0.2 and common mode voltage is 1 V, find output voltage.
Solution:
Vo = Ac × Vc
Vo = 0.2 × 1 = 0.2 V
Problem 83
Question:
A differential amplifier has CMRR = 500 and differential gain Ad = 200. Find common mode gain.
Solution:
CMRR = Ad / Ac
Ac = Ad / CMRR
Ac = 200 / 500
Ac = 0.4
Problem 84
Question:
If differential gain Ad = 300 and input difference voltage = 10 mV, find output voltage.
Solution:
Vo = Ad × Vd
Vo = 300 × 10 mV
Vo = 3 V
Problem 85
Question:
If differential amplifier output is zero, what can be said about the inputs?
Answer:
Both input voltages are equal.
Problem 86
Question:
Which type of signal is rejected by differential amplifier?
Answer:
Common Mode Signal
Problem 87
Question:
What is the purpose of current mirror in differential amplifier?
Answer:
To provide constant bias current.
Problem 88
Question:
Which amplifier stage in an operational amplifier provides high gain?
Answer:
Differential Amplifier Stage
Problem 89
Question:
What is the ideal input impedance of differential amplifier?
Answer:
Very high.
Problem 90
Question:
What is the ideal output impedance of differential amplifier?
Answer:
Very low.
.png)
No comments:
Post a Comment