EE 332 Lesson 0811 - FREQUENCY ANALYSIS IN THE DESIGN OF...

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8/11/2010 1 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock EE 332 DEVICES AND CIRCUITS II WEEK 8 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock FREQUENCY ANALYSIS IN THE DESIGN OF ANALOG CIRCUITS Intentional placed (external) capacitors Scrape frequency response Act as blocking capacitors Inherent (internal) capacitors Transistor Diode Stray capacitors Wires Printed circuit board paths ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock BJT AND ITS CAPACITIVE STRAY (INTERNAL) (1 ) s j D do j A C v W Recall diode capacitances: Depletion capacitance: Diffusion capacitance D T D m T T i C g V A: cross section area W: depletion width v D : Diode voltage j : build-in voltage ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock FREQUENCY RESPONSE OF CE SHORT- CIRCUIT / SMALL SIGNAL MODEL C BE = C = C je (depletion) + C b (diffusion under forward bias) C CB = C = C jc (depletion under reverse bias) Small signal equivalent for high frequencies If R 1 →0 V CC i o R 2 R 1 i i i i C r C r o i o ©UW EE TC Chen
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