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Feed back Amplfier1 - Feedback 1 Amplifier Requirements...

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1 Feedback
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Amplifier Requirements Gain Manufacturing Parameters External Components Temperature Bandwidth 3 dB Low frequency Midband Gain 3 dB High frequency No Distortion Internal Noise External Interference No Loading Input & Output Impedance are matched
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Type of Amplifiers
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Voltage Amplifier Voltage Amplifier Output Voltage is proportional to the input voltage and the proportionality factor is independent of the magnitude of the source & Load resistance Classification of the Amplifier A v = V o /V i R i n >> R s V i ≈ V s R out << R L V o ≈ A v V i A v V s
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Current Amplifier Current Amplifier Output Current is proportional to the input Current and the proportionality factor is independent of the magnitude of the source & Load resistance Classification of the Amplifier A i = I o /I i R i n << R s I i ≈ I s R out >> R L I o ≈ A i I i A i I s
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Trans-conductance Amplifier Trans-conductance Amplifier Output Current is proportional to the input voltage and the proportionality factor is independent of the magnitude of the source & Load resistance Classification of the Amplifier G m = I o /V i R i n >> R s V i ≈ V s R out >> R L I o ≈ G m V i G m V s
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Trans-resistance Amplifier Trans-resistance Amplifier Output Voltage is proportional to the input Current and the proportionality factor is independent of the magnitude of the source & Load resistance Classification of the Amplifier R m = V o /I i R i n << R s I i ≈ I s R out << R L I o ≈ R m I i R m I s
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Types of Amplifiers Voltage Amplifier O utput Vo ltag e   is  pro po rtio nal to  the  input vo ltag e   and the  pro po rtio nality fac to r  is  inde pe nde nt o f the  m ag nitude  o f  the  s o urc e  & Lo ad re s is tanc e Current Amplifier Output Current  is proportional to the  input Current  and the proportionality factor is independent  of the magnitude of  the source & Load resistance Trans-conductance Amplifier Output Current   is proportional to the  input voltage  and the proportionality factor is independent  of the magnitude of  the source & Load resistance Trans-resistance Amplifier Output Voltage   is proportional to the   input Current   and the proportionality factor is independent  of the magnitude of the   source & Load resistance Classifiaction of the Amplifier The classification is based on the magnitude of the input  and output impedance of an amplifier  relative  to  the  s o urc e  and lo ad  im pe danc e , re s pe c tive ly.
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Ideal Amplifier Characteristics Parameter Amplifier Type Voltage Current Trans- conductance Trans- resistance Ri 0 0 Ro 0 0 Transfer  Function V o =A vo V i I o =A is I i I o =G m V i V o =R m I i
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The Feedback Concept For each of the basic amplifier discussed, we may sample the output voltage or current by means of a suitable sampling network and
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