Classification of amplifier A B C

Classification of amplifier

1 Classification on the basis of operating point:- The amplifiers are classified on the basis of operating point selection. The amplifier are classified as class:-

Class A - In this full wave form of input signal is amplified. in this the output is of high quality but efficiency is very less.

Class AB - In this 'less than full but more than half ' wave form of input signal is amplified. in this the output is of quality and efficiency is between class A and class B amplifier.

Class B - In this half wave of input cycle is amplified. Two transistors are used in push pull or darlington pair configuration. its efficiency is better than class A amplifier.

Class C - In this less than 180 degree of input waveform is amplified. It has very high efficiency and used in tuned radio frequency amplification circuits.

2 Classification on the basis of uses:-

1 Audio amplifier- Used for audio frequency amplification. Audio frequency ranges from 20 Hz to 20 kHz.

2.IF amplifier - Used for intermediate frequency (455 kHz) amplification in radios. .

3 RF amplifier - Used for amplification of radio frequencies. It ranges from 500 kHz to 30 MHz for radio broadcasting.

4 Video amplifier- Suitable for video frequency amplification.

5. Many other uses requires differently designed amplifier. Mobile communication and satellite TV system work at very high frequency in the range of GHz. so each system need a specific amplification requirement.