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TYPES OF COUPLING IN AMPLIFIER TYPES OF COUPLING IN AMPLIFIER

TYPES OF COUPLING IN AMPLIFIER - PowerPoint Presentation

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Uploaded On 2018-02-28

TYPES OF COUPLING IN AMPLIFIER - PPT Presentation

The types of coupling used in amplifiers 1 Resistance capacitance RC coupling 2 Inductance LC coupling 3 Transformer coupling TC 4 Direct coupling DC Visit for more Learning Resources ID: 639756

amplifier coupling frequency stage coupling amplifier stage frequency coupled amplifiers output voltage transformer resistance power impedance advantages capacitor signal

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Slide1

TYPES OF COUPLING IN AMPLIFIER

The types of coupling used in amplifiers1. Resistance – capacitance (RC) coupling. 2. Inductance (LC) coupling. 3. Transformer coupling (TC) 4. Direct coupling (D.C.)

Visit for more Learning ResourcesSlide2

Two stage transformer coupled amplifier. Slide3

Advantages:

Transformer coupling is mostly employed for impedance matching It is used as final stage. It is used to transfer power to the low impedance lad such as loudspeaker. For amplification of radio frequency (RF) signal. In power amplifiers. Slide4

single stage CE amplifierSlide5

Operation of Single stage CE amplifier

The circuit diagram of a voltage amplifier using single transistor in CE configuration is shown in figure. It is also known as a small-signal single-stage CE amplifier or RC coupled CE amplifier. It is also known as a voltage amplifier. The potential divider biasing is provided by resistors R1, R2 and RE. It provides good stabilization of the operating point. The capacitors CC1 and CC2 are called the coupling capacitors used to block the AC voltage signals at the input and the output sides.

The capacitor CE works as a bypass capacitor. It bypasses all the AC currents from the emitter to the ground and avoids the negative current feedback. It increases the output AC voltage.

The resistance RL represents the resistance of whatever is connected at the output. It may be load resistance or input resistance of the next stageSlide6

Types of Coupling in Multistage

In multistage amplifiers, the output signal of preceding stage is to be connected to the input of next stage.Coupling techniques:R-C couplingTransformer Coupling

Direct CouplingSlide7

Two stage RC coupled amplifier Slide8
Slide9

Advantages of RC coupled Amplifier

Wide frequency responseIt is most convenient couplingIt is inexpensive way of coupling distortion in output is low

It is high fidelity amplifier

No core distortionSlide10

Application

In Public Address amplifier systemTape RecorderTV, VCR and CD playerStereo amplifiers

RC coupled amplifiers are basically voltage amplifiersSlide11

Transformer Coupled Amplifier

Slide12

Advantages

Impedance matching between the stages is possibleHigher voltage gain than RC coupled amplifiers

DC biasing of individual stages will remain unchanged even after cascading.

Disadvantages

Coupling transformer is expensive and bulky

Frequency response is not perfectly flat

There is possibility of core saturation

Low frequency due to losses in transformerSlide13

Applications

For Impedance matchingFor amplification of radio frequency (RF) signalIn power amplifiersFor transferring power to low impedance load and such as a

loude

speakerSlide14

Direct coupled amplifierSlide15

Advantages

Due to absence of coupling capacitor, the gain does not reduce on the lower frequency sideWide frequency response

This amplifier can amplify even the DC signal

Reduced cost and complexity due to absence of coupling capacitor

Disadvantages

DC biasing conditions of the individual stages do not remain same after cascading

Poor frequency response at higher frequencies

Output waveform has DC shift

Poor temperature stabilitySlide16

Application

In operation Amplifiers (OP-AMP)In analog computationIn linear Power supplies

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