1. 10
Transistor Amplifiers and Switches

2. Figure 10.2 Graphical interpretation of h parametersB ( 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

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

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

5. Figure 10.9 Effect of coupling capacitors on DC and AC current paths2 B V CC + – v
out ( t )
DC current
AC current ~ 1

6. Figure 10.10 DC and AC circuits for the common-emitter amplifier2 C E V CC
(a) DC circuit || v S ( t )
(b) AC circuit L + _ ~

7. Figure 10.11 DC bias circuit for the common-emitter amplifierV CC BB I CQ BQ
CEQ _ +

8. 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

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

10. Figure 10.28 DC circuit for the common-source amplifierV
GSQ + – D 2 S DD
DSQ

11. 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

12. 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

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

14. Figure 10.50 MOSFET switching characteristicv 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