Feed back Amplfier1 - 1 Feedback Amplifier Requirements...

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Unformatted text preview: 1 Feedback 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 Type of Amplifiers 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 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 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 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 Types of Amplifiers Voltage Amplifier O utput Vo ltag e is pro po rtio nal to the input vo lta g e a nd the pro po rtio na lity fa c to r is inde pe nde nt o f the m ag nitude o f the s o urc e & Lo a d re s is ta nc 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 a nd lo a d im pe danc e , re s pe c tive ly. Ideal Amplifier Characteristics Parameter Amplifier Type Voltage Current Trans- conductance Trans- resistance Ri Ro 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 The Feedback Concept For each of the basic amplifier discussed, we may sample the output voltage or current...
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This note was uploaded on 10/18/2011 for the course ELECTRICAL 12 taught by Professor Mamamia during the Spring '10 term at College of E&ME, NUST.

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Feed back Amplfier1 - 1 Feedback Amplifier Requirements...

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