Classification of Amplifiers
Amplifiers are classified in the following ways.
1. According to the Type of Load
Impedance:
According to this method of classification
amplifiers may be classified as
(a)
Un
tuned amplifiers
(b)
Tuned
amplifiers
Un tuned amplifiers may further be
classified as
(i) Audio
frequency amplifiers
(ii) Video
frequency amplifiers
(i) Single
tuned amplifiers
(ii) Double
tuned amplifiers
(iii) Stagger
tuned amplifiers
2. According to the Frequency Range
:
:
According to this method of
classification amplifiers may be classified as
(a)
D.C.
amplifiers (for zero frequency or D.C.)
(b)
Audio
frequency amplifiers (20 Hz to 20 KHz)
(c)
Video
frequency amplifiers (0to few MHz (5 MHz))
(d)
Ultra-high
frequency and micro wave amplifiers (upto several GHz)
3. According to the Number of Stages and
Method of Coupling
:
:
The
amplifiers may be classified as
(a)
Single
stage amplifiers and
(b)
Multistage
amplifiers
Multistage amplifiers may further be
classified according to the method of coupling i.e. the output of one stage to
the input of the next. These are classified as
(a)
Direct-Coupled
amplifiers
(b)
R.C.
Coupled Amplifiers and
(c)
Transformer
Coupled amplifiers
4. According to the Primary Function:
The amplifiers may be classified as
(a)
Small
signal amplifiers and
(b)
Large
signal amplifiers.
5. According to Method of Operation:
The portion
of operating point and the extent of the characteristics used determine the
category of operation. Thus amplifiers may be classified as
(a)
Class
A amplifiers
(b)
Class
B amplifiers
(c)
Class
AB amplifiers and
(d)
Class
C amplifiers
6. According to Ground Connection:
According to this method of
classification amplifiers may be classified as
(a)
Common
emitter amplifiers
(b)
Common
base amplifiers
(c)
Common
collector amplifiers
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