Chapter 7 Frequency Response1

Chapter 7 Frequency Response1 - Chapter 7 Frequency...

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Unformatted text preview: Chapter 7 Frequency Response Introduction 7.1 s-Domain analysis: poles,zeros and bode plots 7.2 the amplifier transfer function 7.3 Low-frequency response of the common-source and common-emitter amplifier 7.4 High-frequency response of the CS and CE amplifiers 7.5 The CB, CG and cascode configurations Introduction Why shall we study the frequency response? Actual transistors exhibit charge storage phenomen a that limit the speed and frequency of their operation . l Aims: the emphasis in this chapter is on analysis. focusing attention on the mechanisms that limit frequency response and on methods for extending amplifier bandwidth. .exe Three parts: s-Domain analysis and the amplifier transf er function (April 13,2008) High frequency model of BJT and MOS; L ow-frequency and High-frequency respons e of the common-source and common-emi tter amplifier (April 15,2008) Frequency response of cascode, Emitter a nd source followers and differential amplifi er (April 22,2008) Part I: s-Domain analysis Zeros and poles Bode plots The amplifier transfer function 7.1 s-Domain analysis Frequency Response Transfer function: poles, zeros Examples: high pass and low pass Bode plots: Determining the 3-dB freq uency Transfer function: poles, zeros Most of our work in this chapter will be concerned with finding amplifier voltage gain as a transfer function of t he complex frequency s. A capacitance C: is equivalent an impedance 1/SC An inductance L: is equivalent an impedance SL Voltage transfer function: by replacing S by jw, we ca n obtain its magnitude response and phase response 1 1 1 1 ... ... ) ( / ) ( ) ( b s b s a s a s a s V s V s T n n n m m m m i o + + + + + + = =---- Transfer function: poles, zeros Z 1 , Z 2 , Z m are called the transfer-function zeros or tr ansmission zeros . P 1 , P 2 , P m are called the transfer-function poles or n atural modes . The poles and zeros can be either real or complex nu mbers, the complex poles(zeros) must occur in conjug ate pairs. ) )......( )( ( ) )......( )( ( ) ( / ) ( ) ( 2 1 2 1 n m m i o P s P s P s Z s Z s Z s a s V s V s T------ = = First-order Functions All the transfer functions encou ntered in this chapter have real poles and zeros and can be writ ten as the product of first-order transfer functions...
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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 7 Frequency Response1 - Chapter 7 Frequency...

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