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Unformatted text preview: Chapter 7 Frequency Response Introduction 7.1 sDomain analysis: poles,zeros and bode plots 7.2 the amplifier transfer function 7.3 Lowfrequency response of the commonsource and commonemitter amplifier 7.4 Highfrequency 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: sDomain analysis and the amplifier transf er function (April 13,2008) High frequency model of BJT and MOS; L owfrequency and Highfrequency respons e of the commonsource and commonemi tter amplifier (April 15,2008) Frequency response of cascode, Emitter a nd source followers and differential amplifi er (April 22,2008) Part I: sDomain analysis Zeros and poles Bode plots The amplifier transfer function 7.1 sDomain analysis Frequency Response Transfer function: poles, zeros Examples: high pass and low pass Bode plots: Determining the 3dB 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 transferfunction zeros or tr ansmission zeros . P 1 , P 2 , P m are called the transferfunction 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 = = Firstorder Functions All the transfer functions encou ntered in this chapter have real poles and zeros and can be writ ten as the product of firstorder 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.
 Fall '10
 ChengJianping

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