Darlington pairs are frequently used in linear ICs because they

Darlington pairs are frequently used in linear ICs because they
| Darlington pairs are frequently used in linear ICs because they

A. Do not require any capacitor or inductors

B. Have enormous impedance transformation capability

C. Can be readily formed/hooked from two adjacent transistors

D. Resemble emitter follower

Please scroll down to see the correct answer and solution guide.

Right Answer is: B

SOLUTION

Darlington pair:

IE = (1 + β) Ix

= (1 + β)(1 + β) IB

IE = (1 + β)2 IB

 

Rx = rπ2 + (1 + β) RE

Rin = rπ1 + (1 + β) Rx

Rin = rπ1 + (1 + β) \(\left[ {{r_{{\pi _2}}} + \left( {1 + \beta } \right){R_E}} \right]\)

  • It has a high current gain (impedance transformation capability)
  • It has a high input resistance
  • It is used as a power booster in power amplifiers

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