Electronic Circuits EE359A

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1 Electronic Circuits EE359A Bruce McNair B Lecture

2 Bistable circuit If v + > 0, v 0 = V max à v + > 0 If v + < 0, v 0 = -V max à v+ < 0 437

3 Bistable circuit physical analogy 438

4 Bistable circuit transfer function 439

5 Noninverting bistable circuit transfer function 440

6 Using bistable to clean up noisy signals 441

7 Relaxation oscillator R V c V B C t 442

8 Relaxation oscillator R V c V B C t 443

9 Astable multivibrator 444

10 Astable multivibrator 445

11 Astable multivibrator Square wave output 446

12 Triangle/square wave generator Integrator 447

13 Monostable multivibrator 448

14 The 555 timer IC 449

15 R-S Flip flop R Q S Q S R Q n Q n Q n-1 Q n undefined 450

16 R-S Flip flop R Q S Q R Q S Q 451

17 555 as a monostable multivibrator 452

18 555 as an astable multivibrator 453

19 Non-linear wave shaping 454

20 Diode shaping networks 455

21 Output Stages and Power Amplifiers Ch

22 Multistage amplifiers - rationale High input Z for minimal loading High power output (differential input for noise immunity) High gain (in multiple stages) Low output Z for minimal impact from load 457

23 Multistage amplifiers - rationale High input Z for minimal loading High power output (differential input for noise immunity) High gain (in multiple stages) Low output Z for minimal impact from load 458

24 General considerations in (output) power amplifiers in out 459

25 General considerations in (output) power amplifiers out in out in Linearity 460

26 General considerations in (output) power amplifiers DC power in out in out Efficiency Signal power out in Linearity 461

27 General considerations in (output) power amplifiers DC power in Heat (and cooling) out in out Efficiency Signal power out in Linearity 462

28 General amplifier tradeoffs conduction angle Best linearity Lowest efficiency conduction angle Moderate linearity Moderate efficiency <180 0 conduction angle Poor linearity Best efficiency 463

29 General amplifier tradeoffs conduction angle Best linearity Class A Lowest efficiency conduction angle Moderate linearity Class B Moderate efficiency <180 0 conduction angle Poor linearity Class C Best efficiency 464

30 Class A amplifier 465

31 Class A amplifier Bias circuit 466

32 Class A amplifier Bias circuit Emitter follower amplifier 467

33 Class A amplifier vo = vi vbe1 468

34 Class A amplifier 469

35 Class A amplifier Large linear range Q 1 turns off 470

36 Class A efficiency Output voltage 471

37 Class A efficiency Output voltage Collector-emitter voltage 472

38 Class A efficiency Output voltage Collector-emitter voltage Collector current 473

39 Class A efficiency Output voltage Collector-emitter voltage Collector current 474

40 Class A efficiency Output voltage Collector-emitter voltage Collector current Power dissipation 475

41 Class A efficiency P P L η = S Power delivered to load Power supplied to circuit For a sinusoidal signal with peak voltage P L = 2 2 = R L 2 2R L Supply power is P = 2V I S CC η P L P S = Efficiency is 2 2R L 2V CC I = 1 4 IR L V CC 476

42 Class A efficiency P P L η = S Power delivered to load Power supplied to circuit For a sinusoidal signal with peak voltage P L = 2 2 = R L 2 2R L Supply power is P = 2V I S CC η P L P S = Efficiency is 2 2R L 2V CC I = 1 4 IR L V CC 477

43 Class A efficiency P P L η = S Power delivered to load Power supplied to circuit For a sinusoidal signal with peak voltage P L = 2 2 = R L 2 2R L Supply power is P = 2V I S CC η P L P S = Efficiency is 2 2R L 2V CC I = 1 4 IR L V CC 478

44 Class A efficiency P P L η = S Power delivered to load Power supplied to circuit For a sinusoidal signal with peak voltage P L = 2 2 = R L 2 2R L Supply power is P = 2V I S CC η P L P S = Efficiency is 2 2R L 2V CC I = 1 4 IR L V CC 479

45 Class A efficiency η P L P S = 2 2R L 2V CC I = 1 4 IR L V CC But V CC and IR L So η 1 4 Best efficiency when = V CC = IR L 480

46 Class A efficiency η P L P S = 2 2R L 2V CC I = 1 4 IR L V CC But V CC and IR L So η 1 4 Best efficiency when = V CC = IR L Class A isn t practical for stages that develop any appreciable amount of power 481

47 Class B output stage 482

48 Class B output stage Push Pull 483

49 Class B transfer characteristic 484

50 Class B dead band 485

51 Class B operation 10 5 ClassB( x) x 4 2 h( t) t 0 ( ) 20 log A j j 486

52 Class B operation 10 5 ClassB( x) x 4 2 h( t) t 0 ( ) 20 log A j j 487

53 Class B efficiency 488

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