Fundamental Physics/Electronics/Electronics Amplifier

Electronics Amplifier

Electronics amplifier is an electronics device that provides voltage amplification . Electronics amplifier has a transfer function

H={\frac {v_{o}}{v_{i}}}=\pm A

With

A - Amplification factor

the positive sign - means positive amplification . The circuit that provides positive amplification is called Non-inverting amplifier

the negative sign - means negative amplification . The circuit that provides negative amplification is called Inverting amplifier

Using Op amp to provide positive amplification

{\frac {v_{o}}{v_{i}}}=1+{\frac {R_{2}}{R_{1}}}

With

R_{2}=AR_{1}

.

v_{o}=Av_{i}

Using Transistor to provide positive amplification

{\frac {v_{o}}{v_{i}}}=({\frac {R_{2}}{R_{2}+R_{1}}})({\frac {R_{4}}{R_{3}}})

With

R_{1}=0.R_{4}=AR_{3}

.

v_{o}=Av_{i}

Using Transformer to provide positive amplification

{\frac {v_{o}}{v_{i}}}={\frac {N_{2}}{N_{1}}}

With

N_{2}=AN_{1}

.

v_{o}=Av_{i}

Using Op amp to provide positive amplification

{\frac {v_{o}}{v_{i}}}=-{\frac {R_{2}}{R_{1}}}

With

R_{2}=AR_{1}

.

v_{o}=-Av_{i}

Using Transistor to provide positive amplification

{\frac {v_{o}}{v_{i}}}={\frac {R_{2}}{R_{2}+R_{1}}}{\frac {R_{4}}{R_{3}}}

With

R_{1}=0.R_{4}=(A+1)R_{3}

.

v_{o}=-Av_{i}

Using Transformer to provide positive amplification

{\frac {v_{o}}{v_{i}}}=-{\frac {N_{2}}{N_{1}}}

With

N_{2}=AN_{1}

.

v_{o}=-Av_{i}

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