Question

For frequency Response Analysis of an operational Amplifier : A. Identify dominant poles
B. Draw Bode magnitude plot
C. Apply gain-bandwidth product concept
D. Determine closed loop gain
E. Assess stability margin Choose the correct answer from the options given below :

• A. A, B, C, D, E
• B. A, B, D, E, C
• C. D, A, E, B, C
• D. D, A, C, B, E

Hint:

Frequency response analysis sequence: \[ \text{Gain} \rightarrow \text{Poles} \rightarrow \text{Gain-bandwidth} \rightarrow \text{Bode plot} \rightarrow \text{Stability} \]

Answer 1

The Correct Option is D

Concept: Frequency response analysis of an operational amplifier is performed systematically to evaluate:
• amplifier gain,
• bandwidth,
• pole effects,
• stability,
• frequency behavior. The process follows a logical engineering sequence.

Step 1: Determining the closed loop gain. The first step is: \[ \text{Determine closed loop gain} \] Closed loop gain defines:
• amplifier operating condition,
• bandwidth requirement,
• feedback behavior. Hence: \[ D \] comes first.

Step 2: Identifying dominant poles. After determining gain configuration, important poles affecting response are identified. Dominant pole determines:
• gain roll-off,
• cutoff frequency,
• stability behavior. Thus: \[ A \] comes next.

Step 3: Applying gain-bandwidth product concept. For operational amplifiers: \[ A_v \times BW = \text{constant} \] This relation helps determine bandwidth corresponding to chosen gain. Hence: \[ C \] comes after pole identification.

Step 4: Drawing Bode magnitude plot. Using gain and pole information:
• frequency response curves,
• gain variation,
• slope changes are represented using Bode plots. Thus: \[ B \] comes next.

Step 5: Assessing stability margin. Finally:
• phase margin,
• gain margin,
• stability conditions are checked from the frequency response. Therefore: \[ E \] comes last.

Step 6: Writing the correct sequence. Hence correct sequence is: \[ D,\;A,\;C,\;B,\;E \] Therefore correct option is: \[ \boxed{(4)} \]