EE 204 Analog Electronics
Practice Problem -1
Q1. Find Thevenin’s equivalent resistance across node a and b for the following circuit:
Q2. Find Norton’s equivalent current across a,b nodes for the following circuit:
Q3. Calculate the gain for the following circuit: [Assume the opamp to be ideal.]
Q4. Design an inverting amplifer for a nominal closed-loop gain of −100, an input resistance of 2 kΩ,
and a gain error of ≤ 10%. Specify R1 , R2 , and the minimum A required. [Gnominal = – R2 ⁄ R1]
[ Gain Error = (G- Gnominal )/ Gnominal]
Q5. Assume the opamp to be ideal:
1. Find I1,I2,I3,IL and Vx.
2. If Vo is not to be lower than -13V, find maximum allowed value for RL.
3. If RL is varied in range 100 to 1k ohms, what is corresponding change in IL and VO.
Q6. Use 2 ideal opamps and resisitors to implement summing function v O = v1 + 2v2 – 3v3 – 4v4.
Q7. Assuming the opamp to be ideal, say Vin = 4sin(t). Plot Vout vs Vin.
Q8. Assume a non ideal opamp with DC gain of 1000 and output impedance of 100 ohms. Find the
output impedance when the opamp is in unity gain buffer configuration.