BJT Internal Capacitances and High Frequency Model - BITS Pilani

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High frequency Hybrid-π

model

Emitter base capacitance

(C de +C je )pfarads

B

B’

Collector base

capacitance

(Few tens of Ωs)

Since r x

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High frequency Hybrid-π model Emitter base capacitance (C de +C je )pfarads B B’ Collector base capacitance (Few tens of Ωs) Since r x

Cut off frequency ۞Value of Cπ is not given in the data sheet rather behavior of β (or hfe) versus frequency is normally given. ۞To find Cπ and Cµ , derive an expression for hfe. i.e short circuit current gain as a function of frequency interms of hybrid π components. Consider following model BITS Pilani, Dubai Campus

Page 1 and 2: BITS Pilani presentation BITS Pilan
Page 3 and 4: BJT Internal Capacitances ۞Transis
Page 5 and 6: BJT Internal Capacitances The Base
Page 7: High frequency Hybrid-π model Emit
Page 11 and 12: Cut off frequency E I c I b sC µ V
Page 13 and 14: Cut off frequency The model is vali

BJT Internal Capacitances and High Frequency Model - BITS Pilani

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