Basic Electronics Paper 2, WASSCE (SC), 2016

Question 5

  1. State three types of amplifier.
  2. Copy and complete Table 1

Class of amplifier

Operating point

A

 

B

 

C

 

 

State one property of an ideal operational amplifier.

Observation

(a)  -  Push-pull amplifier
-  Operational amplifier
-  Voltage amplifier
-  Power amplifier
- Type of amplifier in terms of class (A,B,C)
- RF power amplifier.

 

(b)

Class of Amplifier

Operating point

A.

Biased near the middle of linear region

B.

Biased at cut-off point

C.

Biased beyond cut-off point (region)

 

(c) Property of Op-Amps
-  Infinite voltage gain
-  Infinite input impedance
-  Zero output impedance
-  Infinite bandwidth
-  Zero input offset voltage