1 Electronic Circuits MULTI STAGE AMPLIFIERS

2 Electronic Circuits There are several different multi-stage amp circuits that function as dc-amps. 1)COMPLIMENTARY AMPLIFIER 2)DARLINGTON AMPLIFIER 3)DIFFERENTIAL AMPLIFIER There are several different multi-stage amp circuits that function as dc-amps. 1)COMPLIMENTARY AMPLIFIER 2)DARLINGTON AMPLIFIER 3)DIFFERENTIAL AMPLIFIER

3 Electronic Circuits COMPLIMENTARY AMPLIFIERS

4 Electronic Circuits DARLINGTON AMPLIFIERS

5 Electronic Circuits DIFFERENTIAL AMPLIFIERS

6 Electronic Circuits Typically referred to as (audio frequency amps) or audio amplifiers. These amps are used to amplify the audio spectrum, utilizing class A operation. Class A operates at the full 360 degree wave form. RC coupled and transformer coupled. Typically referred to as (audio frequency amps) or audio amplifiers. These amps are used to amplify the audio spectrum, utilizing class A operation. Class A operates at the full 360 degree wave form. RC coupled and transformer coupled.

7 Electronic Circuits RC COUPLED AUDIO AMPLIFIER

8 Electronic Circuits Transformer coupled stages are more efficient, therefore it is used more often. Transformers provide isolation between stages and matches output and input impedances for a minimum of loading.0 This provides maximum transfer of power. Transformer coupled stages are more efficient, therefore it is used more often. Transformers provide isolation between stages and matches output and input impedances for a minimum of loading.0 This provides maximum transfer of power.

9 Electronic Circuits TWO STAGE TRANSFORMER COUPLED AUDIO AMPLIFIER

10 Electronic Circuits

11 Electronic Circuits TRANSFORMER TYPE, PUSH PULL POWER AMPLIFIER

12 Electronic Circuits Video amps must be a wide band amplifier. Video signals range from 10hz to 5mhz. Video amps are typically RC coupled amps. An inductor is added to the coupling circuit for frequency compensation. Common-emitter circuits are used for amplification. Video amps must be a wide band amplifier. Video signals range from 10hz to 5mhz. Video amps are typically RC coupled amps. An inductor is added to the coupling circuit for frequency compensation. Common-emitter circuits are used for amplification.

13 Electronic Circuits VIDEO AMPLIFIER

14 Electronic Circuits Radio frequency and intermediate frequency. The radio frequency band ranges from 10khz to 30,000mhz. The RF amp amplifies these radio frequencies received by an antenna then amplify that received signal. Radio frequency and intermediate frequency. The radio frequency band ranges from 10khz to 30,000mhz. The RF amp amplifies these radio frequencies received by an antenna then amplify that received signal.

15 Electronic Circuits BLOCK DIAGRAM OF A TYPICAL RECEIVER