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【正文】 circuit (4) Find the input resistance πBiii rRIVR ???3. Circuit Analysis with SmallSignal Model (4) Find the output resistance 0i ?V 0b ?I 0π ?VRo = RC Thus I b R C I c g m V π Vx r π R B + ? V π + ? I x ? Get equivalent circuit of finding output resistance Ro Set independent source zero RL is open Add test voltage at output 3. Circuit Analysis with SmallSignal Model Example 1 Calculate the smallsignal voltage gain of the bipolar transistor circuit shown in Fig. Assume ?=100, VCC=12V, VBE=, RC=6k?, RB=50k?, VBB=. If vi=?t V, find vo . Sol: (1) Find the Qpoint values 6Vk6mA112CCCCCE ?????? ?RIVVmA1uA101 0 0BC ???? IβIuA1050 BBEBBB ?????RVVI + ? i B R C v O V BB i C V BE R B + ? V CC + ? V CE + ? v i 3. Circuit Analysis with SmallSignal Model Example 1 ? CQπ ????IVr T?and m A / 1CQm ???TVIg BππCmio???????????RrrRgVVA v + I b R C I c g m V ? R B ? + ? + ? V i V ? Vo r ? ?????? kπBi ??? k6co RR(2) Find the smallsignal parameters + ? i B R C v O V BB i C V BE R B + ? V CC + ? V CE + ? v i (3) Find AC parameters 3. Circuit Analysis with SmallSignal Model Example 1 A)(s i s i πBib ??? ttrRvi ?????(3) In smallsignal circuit, ac base current is given by )(s i i mAttiβi ?? ????)V(s )s (cco ttRiv ?? ??????? + I b R C I c g m V ? R B ? + ? + ? V i V ? Vo r ? 3. Circuit Analysis with SmallSignal Model Example 2 R B R C v o + ? ?R L T V CC + ? ?+ + C 2 C 1 v i Com m on E m it te r Circu it Find the smallsignal voltage gain, input resistor and output resistor in single base resistor biasing CE circuit. (1) SmallSignal Equivalent Circuit I b R C I c ? I b + ? V i + ? V o r π R B RL b c e (2) Voltage gain πbi rIV ??bc II ?? ?),//( LCco RRIV ??πLπbLCbπbLCcio)//()//(rRrIRRIrIRRIVVA v??????????????3. Circuit Analysis with SmallSignal Model Example 2 (3) Input resistor I b R C I c ? I b + ? V i + ? V o r π R B RL b c e πBiii // rRIVR ??Output resistor Co RR ?Observing Circuit Analysis with SmallSignal Model Example 3 The circuit shown in Fig. Draw its smallsignal equivalent circuit. V CC R C R L R E R B2 R B1 C B2 C B1 + v o + v i + + c e b R B1 R B2 R C R E R L r ? +
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