# In the first generation op-amp 709c, the open loop bandwidth of gain versus frequency curve

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In the first generation op-amp 709c, the open loop bandwidth of gain versus frequency curve

(a) Increases from the innermost compensated curve to the outermost

(b) Decrease from the innermost compensated curve to the outermost

(c) Increases from the outermost compensated curve to the innermost

(d) Decreases from the outermost compensated curve to the innermost

I got this question in a dream while sleeping

Origin of the question is Frequency Response of Internally Compensating and Non-Compensating Op-Amp in chapter Practical Limitations of Op Amp Circuits of Linear Integrated Circuits

by (39.8k points)
Right option is (d) Decreases from the outermost compensated curve to the innermost

Let me elaborate: The gain versus frequency curve of 709c decreases from the outermost compensated curve to the innermost. For example,  if C1 =10pF, R1 = 0Ω and C2 = 3pF, the bandwidth ≅ 5kHz.  While if C1 =5000pF, R1 =1.5Ω and C2= 200pF, the bandwidth will be 100Hz.

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