10 Transistor Amplifiers and Switches.

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Presentation transcript:

10 Transistor Amplifiers and Switches

Figure 10.2 Graphical interpretation of h parameters B ( A) V BE (V) BEQ Q BQ CE = V CEQ C (mA) CQ (a) Interpretation of h ie (b) Interpretation of r e (c) Interpretation of fe (d) Interpretation of oe

Figure 10.3 h-parameter small-signal model for BJT V CE 1 oe B C E I + – fe ie BE

Figure 10.7 The BJT common-emitter amplifier S L r o i B 1 2 V CC + – v out ( t ) ~

Figure 10.9 Effect of coupling capacitors on DC and AC current paths 2 B V CC + – v out ( t ) DC current AC current ~ 1

Figure 10.10 DC and AC circuits for the common-emitter amplifier 2 C E V CC (a) DC circuit || v S ( t ) (b) AC circuit L + _ ~

Figure 10.11 DC bias circuit for the common-emitter amplifier V CC BB I CQ BQ CEQ _ +

Figure 10.24 Typical common-drain and common-source MOSFET amplifiers + _ ~ V DD R 1 D v ( t ) S G C 2 L (b) Common-source amplifier (a) Common-drain amplifier

Figure 10.27 MOSFET small-signal model + – V GS g m = I MOSFET small signal model S G MOSFET circuit symbol

Figure 10.28 DC circuit for the common-source amplifier V GSQ + – D 2 S DD DSQ

Figure 10.29 AC circuit for the common-source MOSFET amplifier + _ ~ g m V GS R 1 2 D v ( t ) G S L – I

Figure 10.30 MOSFET source follower and DC circuit + ~ V DD R 1 D v ( t ) S G C 2 out Source follower = R – GG = GSQ DSQ I DC circuit

Figure 10.31 AC equivalent circuit for the MOSFET source follower + _ ~ G V GS R g m v out – S D in

Figure 10.50 MOSFET switching characteristic v in out V DD MOSFET inverter Switching characteristic 1 2 3 4 5 = 5 V R D 4 V B – 3 V 2 V 1 V GS i DS (V) A