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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