chapter 9 _output stages and power amplifiers

chapter 9 _output stages and power amplifiers -...

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Unformatted text preview: Microelectronic Circuits SJTU Yang Hua Chapter 9 output stages and power amplifiers Introduction 9.1 Classification of output stages 9.2 Class A output stage 9.3 Class B output stage 9.4 Class AB output stage 9.5 Biasing the class AB circuit SJTU Yang Hua Microelectronic Circuits Power Amplifier Small-signal approximation and models either are not applicable or must be used with care. THD (total harmonic distortion) Deliver the power to the load in efficient manner. Ex. To provide the amplifier with a low output resistance so that it can deliver the output signal to the load without loss of gain. Power dissipation is as low as possible. SJTU Yang Hua Microelectronic Circuits Classification of Power Amplifier Power amplifiers are classified according to the collector current waveform that results when an input signal is applied. Conducting angle. SJTU Yang Hua Microelectronic Circuits Classification of Power Amplifier c C I I ˆ o 360 angle onduction = c Collector current waveforms for transistors operating in (a) class A, (b) class B o 8 1 angle onduction = c SJTU Yang Hua Microelectronic Circuits Classification of Power Amplifier o o 360 angle onduction 8 1 < < c class AB class C o 180 angle onduction < c SJTU...
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This note was uploaded on 03/02/2012 for the course EI 207 taught by Professor Chengjianping during the Fall '10 term at Shanghai Jiao Tong University.

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chapter 9 _output stages and power amplifiers -...

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