Electronic Circuits EE359A
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1 Electronic Circuits EE359A Bruce McNair B Lecture
2 Class C operation 4 2 h( t) t 0 ( ) 20 log A j Cconduction_angle j π 3 489
3 Class C operation 4 2 h( t) t 0 ( ) 20 log A j Cconduction_angle j π 8 490
4 Power BJTs Collector currents in the multi-ampere range Multi-watt power dissipation Achieved by: High temperature tolerant designs (T J up to 200 o C) Effective heat dissipation design 491
5 Thermal resistance model Power dissipation Thermal resistance TJ TA =θjapd 492
6 Power derating curve Power dissipation at ambient Reduced power rating at increased temperature Maximum allowable junction temperature 493
7 Achieving efficient heat dissipation TO3 package Maximum heat dissipation surface Mounting holes to allow bolting to heat sink 494
8 Modeling heat transfer Junction temperature Heat dissipation Case temperature Heat-sink temperature Ambient temperature 495
9 Modeling heat transfer Junction-case thermal R Heat dissipation Case-heatsink thermal R Heatsink-ambient thermal R 496
10 Modeling heat transfer Heat dissipation Junction-case thermal R Function of transistor/ case design Case-heatsink thermal R Function of bonding transistor to heatsink Heatsink-ambient thermal R Function of heatsink cooling, e.g., conduction, convection, radiation, etc. 497
11 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 498
12 Increasing output power Higher operating voltage High power output stage or Higher collector current 499
13 Increasing output power High power output stage Higher operating voltage or Higher collector current Limitation of V CC Breakdown voltage Output impedance may be small 500
14 Increasing output power High power output stage Higher operating voltage or Higher collector current Limitation of V CC Breakdown voltage Output impedance may be small Darlington configuration for increased β 501
15 NPN Darlington Pair 502
16 PNP Darlington Pair 503
17 PNP Darlington Pair NPN used because of limited PNP performance 504
18 AB Output Stage with Darlington Pair 505
19 AB Output Stage with Darlington Pair NPN Darlington push stage V BE multiplier PNP Darlington pull stage 506
20 What if the v O is shorted? 507
21 What if the v O is shorted? 508
22 AB amplifier with short circuit protection 509
23 Thermal overload protection 510
24 Thermal overload protection Output transistor Normally biased off 511
25 Thermal overload protection Thermal coupling 512
26 Thermal overload protection Operation shifts with changing temperature 513
27 Thermal overload protection Turns on, stealing Q 1 bias current, shutting off Q 1 514
28 Normal MOSFET 515
29 Normal MOSFET Thermal conduction path 516
30 Power MOSFET 517
31 Power MOSFET Thermal conduction path 518
32 AB amplifier with power MOSFETs and BJT drivers 519
33 AB amplifier with power MOSFETs and BJT drivers V BE multiplier 520
34 AB amplifier with power MOSFETs and BJT drivers Push-pull darlington pairs 521
35 AB amplifier with power MOSFETs and BJT drivers CMOS power MOSFET output 522
36 AB amplifier with power MOSFETs and BJT drivers Quiescent point adjustment Temperature compensation adjustment Thermal feedback control 523
37 AB amplifier with power MOSFETs and BJT drivers Parasitic oscillation suppression 524
38 AB amplifier with power MOSFETs and BJT drivers 525
39 Filters and Tuned Amplifiers Ch
40 Two-port model of filter General response: Vo () s Ts () = V() s i 527
41 Two-port model of filter General response: Vo () s Ts () = V() s j ( ) T( jω) = T( jω) e φω i Substituting s = jω and using polar representation: 528
42 Two-port model of filter General response: Vo () s Ts () = V() s j ( ) T( jω) = T( jω) e φω i Substituting s = jω and using polar representation: ( T jω ) G( ω) = 20log ( ) Gain/Attenuation in db: ( T jω ) A( ω) = 20log ( ) 529
43 Ideal filter characteristics (Low-pass) 530
44 Ideal filter characteristics (High-pass) 531
45 Ideal filter characteristics (Band-pass) 532
46 Ideal filter characteristics (Band-stop) 533
47 Practical limitations (Low-pass) 534
48 Practical limitations (Low-pass) Zero-width transition band Infinite attenuation in stop-band 535
49 Practical limitations (Low-pass) Zero-width transition band Infinite attenuation in stop-band Infinite complexity Infinite time delay 536
50 Practical limitations (Low-pass) impulse response input x(t) = δ (t) t output y(t) = sinc(t) = sin(t) t t 537
51 Practical limitations (Low-pass) impulse response input x(t) = δ (t) t output Response precedes input!! y(t) = sinc(t) = sin(t) t t 538
52 Example Low-pass specification Pass-band edge Stop-band edge Pass-band variation Minimum stop-band attenuation - 539
53 Example Band-pass specification Pass-band variation Lower stop-band edge Pass-band edges Upper stop-band edge Minimum stop-band attenuation 540
54 Typical Low-pass specification Often no constraints on filter curve - 541
55 Typical Low-pass specification Often no constraints on filter curve Might be monotonic - 542
56 Typical Low-pass specification Often no constraints on filter curve May have passband ripple - 543
57 Typical Low-pass specification Often no constraints on filter curve May have stop band ripple - 544
58 Typical Low-pass specification Often no constraints on filter curve May have both passband and stopband ripple - 545
59 Typical Low-pass specification Many different approximations to the ideal filter response - 546
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