PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION

PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION 10 Transistor Amplifiers and Switches Mc. Graw-Hill 1 GIORGIO RIZZONI © The Mc. Graw-Hill Companies, Inc. 2000

PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION Figure 10. 2 Graphical interpretation of h parameters IB ( A) IB IBQ I B ( A) VCE = VCEQ VCE Q IBQ VBE (V) 0 VBE (b) Interpretation of h re IC (m. A) ICQ VBE (V) I C (m. A) IC I BQ Q Q I BQ I CQ IB V CEQ 0 0 V CEQ (c) Interpretation of h fe Q 0 VBE (a) Interpretation of h ie IC VCEQ VCE (V) V CE VCE (V) (d) Interpretation of hoe Mc. Graw-Hill 2 GIORGIO RIZZONI © The Mc. Graw-Hill Companies, Inc. 2000

PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION Figure 10. 3 h-parameter small-signal model for BJT C + IB B V CE + VBE – – E C h B h fe ie + h re 1 h oe IB – V CE E Mc. Graw-Hill 3 GIORGIO RIZZONI © The Mc. Graw-Hill Companies, Inc. 2000

PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION Figure 10. 7 The BJT common-emitter amplifier V CC R 1 Mc. Graw-Hill ro B E ri +~ – CC C CB RS RC RL + v out ( t) v S (t) R 2 RE CE 4 GIORGIO RIZZONI – © The Mc. Graw-Hill Companies, Inc. 2000

PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION Figure 10. 9 Effect of coupling capacitors on DC and AC current paths V R CC R 1 C C R S C C + B R E + ~ – v S L v out (t) R R 2 E C E – DC current AC current Mc. Graw-Hill 5 GIORGIO RIZZONI © The Mc. Graw-Hill Companies, Inc. 2000

PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION Figure 10. 10 DC and AC circuits for the common-emitter amplifier RC R 1 V CC R 2 RE (a) DC circuit R v S ( t) _+ ~ R S 1 RC || R R L 2 (b) AC circuit Mc. Graw-Hill 6 GIORGIO RIZZONI © The Mc. Graw-Hill Companies, Inc. 2000

PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION Figure 10. 11 DC bias circuit for the commonemitter amplifier C R B + B V I BQ V BB E RC CEQ _ V R Mc. Graw-Hill I CQ CC E 7 GIORGIO RIZZONI © The Mc. Graw-Hill Companies, Inc. 2000

PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION Figure 10. 24 Typical common-drain and common-source MOSFET amplifiers V R R 1 D C S G + _ ~ v ( t ) DD R C 2 R R S L (a) Common-drain amplifier V R R R 1 C v ( t) R Mc. Graw-Hill C S 2 C R (b) Common-source amplifier D D G + _ ~ DD S 8 GIORGIO RIZZONI S R L © The Mc. Graw-Hill Companies, Inc. 2000

PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION Figure 10. 27 MOSFET small-signal model D G g m VGS = ID + VGS – G S MOSFET small signal model Mc. Graw-Hill D S MOSFET circuit symbol 9 GIORGIO RIZZONI © The Mc. Graw-Hill Companies, Inc. 2000

PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION Figure 10. 28 DC circuit for the commonsource amplifier D + R 1 G + V GSQ V DD Mc. Graw-Hill R 2 V DSQ – S RS 10 GIORGIO RIZZONI RD – V DD © The Mc. Graw-Hill Companies, Inc. 2000

PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION Figure 10. 29 AC circuit for the commonsource MOSFET amplifier ID D + R v(t) + _~ Mc. Graw-Hill G R 1 R 2 + VGS – gm VGS S 11 GIORGIO RIZZONI RD RL v. L(t) – © The Mc. Graw-Hill Companies, Inc. 2000

PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION Figure 10. 30 MOSFET source follower and DC circuit V DD C R R 1 D G + ~ v ( t) R 2 S V Mc. Graw-Hill R G V GG G + V GSQ GG – + RS Source follower R C v out – ID + V DSQ – R S V DD = R 1 R 2 = R 2 V DD R 1 + R 2 DC circuit 12 GIORGIO RIZZONI © The Mc. Graw-Hill Companies, Inc. 2000

PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION Figure 10. 31 AC equivalent circuit for the MOSFET source follower G D + V GS + ~ _ v in RG S RS gm V GS – + v out – Mc. Graw-Hill 13 GIORGIO RIZZONI © The Mc. Graw-Hill Companies, Inc. 2000

PRINCIPLES AND APPLICATIONS OF ELECTRICAL ENGINEERING THIRD EDITION Figure 10. 50 MOSFET switching characteristic VDD RD v out v in MOSFET inverter V i. D VDD RD GS =5 V 4 V B 1 RD – 0 1 2 3 3 V 2 V 1 V A Switching characteristic Mc. Graw-Hill 14 GIORGIO RIZZONI 4 5 V DD = 5 V v DS (V) © The Mc. Graw-Hill Companies, Inc. 2000