Chapter 7 Frequency Response2

Chapter 7 Frequency Response2 - Chapter 7 Frequency...

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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
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The Gate Capacitive Effect MOSFET operates at triode region MOSFET operates at saturation region MOSFET operates at cutoff region ox gd gs WLC C C 2 1 = = = = 0 3 2 gd ox gs C WLC C = = = ox gb gd gs WLC C C C 0
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Overlap Capacitance Overlap capacitance results from the fact that the source and drain diffusions extend slightly under the gate oxide. The expression for overlap capacitance Typical value This additional component should be added to Cgs and Cgd i n all preceding formulas. ox ov ov C WL C = L L ov 1 . 0 05 . 0 - =
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The Junction Capacitances Source-body depletion-layer capacitance drain-body depletion-layer capacitance o SB sb sb V V C C 1 0 = o DB db db V V C C 1 0 =
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High-Frequency MOSFET Model
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High-Frequency Model (b) The equivalent circuit for the case in which the source is connected to the substrate (body). (c) The equivalent circuit model of (b) with Cdb neglected (to simplify analysis).
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The MOSFET Unity-Gain Frequency Current gain Unity-gain frequency ) ( gd gs m i o C C s g I I + = ) ( 2 gd gs m T C C g f + = π
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7.3 Low-frequency response of the CS and CE amplifiers
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Low-frequency response of the CS
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The procedure to find quickly the time constant: 1. Reduce Vsig to zero 2. Consider each capacitor separately; that is , assume that the other Capacitors are as perfect short circuits 3. For each capacitor, find the total resistance seen between its terminals
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Low frequency small signal analysis:
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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 Response2 - Chapter 7 Frequency...

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