PHY 441A (20/01/2022)
Practice assignment -2
Question 1: For the following circuit show that if
𝐴𝐴𝐶𝐶𝐶𝐶 = �1 +
𝑅𝑅𝑓𝑓
𝑅𝑅𝐼𝐼
𝑅𝑅
= 𝑅𝑅2 then,
3
𝑅𝑅𝑓𝑓
� 𝑎𝑎𝑎𝑎𝑎𝑎 𝑉𝑉𝑜𝑜 = 𝐴𝐴𝐶𝐶𝐶𝐶 (𝑉𝑉1 − 𝑉𝑉2 )
𝑅𝑅𝐼𝐼
Question 2: For the following circuit, show that
2
𝑉𝑉𝑜𝑜 = 𝑅𝑅𝑅𝑅 ∫ 𝑉𝑉𝑖𝑖𝑖𝑖 𝑑𝑑𝑑𝑑
Question 3: For the following circuit prove that: 𝐼𝐼𝐿𝐿 =
𝑉𝑉𝑖𝑖𝑖𝑖
𝑅𝑅
Question 4: Derive expression for V out Voltage gain A CL for the following
circuit, given 𝑅𝑅𝑓𝑓 = (𝑛𝑛 − 1)𝑅𝑅𝐼𝐼 .
Question 5:
Explain the working of the following amplifier circuit and find an expression
for its gain.
Question 6: If the following wave form is fed to the NI terminal of an open loop
IC741 circuit, draw the output waveform.
What would be the output if the input is connected to the NI terminal of
a closed loop IC 741 amplifier with gain ~ 10?
2.0
1.5
1.0
Vin
0.5
0.0
-0.5
-1.0
-1.5
-2.0
0
1
2
3
4
5
6
Time
7
8
9
10
11
12