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In the above circuit the optimum low frequency compensation is obtained when

In the above circuit the optimum low frequency compensation is obtained when Correct Answer <p>C<sub>1</sub> (R<sub>C</sub> || R<sub>1</sub>) = C<sub>C</sub>R<sub>i</sub></p>

Concept:

Frequency compensation:

It is a technique used in amplifiers especially in negative feedback amplifiers. It usually has two primary goals.

i) To avoid unintentional creation of positive feedback because positive feedback decreases the stability of the system.

ii) It is used extensively to improve the bandwidth of the system.

Condition for low-frequency compensation:

CL RL = Ci Ri

CL, RL ⇒ Load capacitor and resister

Ci, Ri ⇒ input capacitor and resister.

Analysis:

According to given circuit:

CL = C1    

RL = R1 ∥ RC

Ci = Cc, Ri = Ri

Hence condition is

C1(R1 ∥ Rc) = C­cRi

More information:

1) Dominant pole compensation:

It is log compensation

  1. The lowest frequency pole is called the dominant pole.
  2. It is used for relatively low closed-loop gain.
  3. It reduces the bandwidth and slew rate of the amplifier.

Feedforward compensation:

It uses a capacitor to bypass a stage in the amplifier at high frequency.

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