Electronic Circuits EE359A
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1 Electronic Circuits EE359A Bruce McNair B Lecture
2 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 497
3 Thermal resistance model Power dissipation Thermal resistance TJ TA =θjapd 498
4 Power derating curve Power dissipation at ambient Reduced power rating at increased temperature Maximum allowable junction temperature 499
5 Achieving efficient heat dissipation TO3 package Maximum heat dissipation surface Mounting holes to allow bolting to heat sink 500
6 Modeling heat transfer Junction temperature Heat dissipation Case temperature Heat-sink temperature Ambient temperature 501
7 Modeling heat transfer Junction-case thermal R Heat dissipation Case-heatsink thermal R Heatsink-ambient thermal R 502
8 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. 503
9 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 504
10 Increasing output power Higher operating voltage High power output stage or Higher collector current 505
11 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 506
12 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 507
13 NPN Darlington Pair 508
14 PNP Darlington Pair 509
15 PNP Darlington Pair NPN used because of limited PNP performance 510
16 AB Output Stage with Darlington Pair 511
17 AB Output Stage with Darlington Pair NPN Darlington push stage V BE multiplier PNP Darlington pull stage 512
18 What if the v O is shorted? 513
19 What if the v O is shorted? 514
20 AB amplifier with short circuit protection 515
21 Thermal overload protection 516
22 Thermal overload protection Output transistor Normally biased off 517
23 Thermal overload protection Thermal coupling 518
24 Thermal overload protection Operation shifts with changing temperature 519
25 Thermal overload protection Turns on, stealing Q 1 bias current, shutting off Q 1 520
26 Normal MOSFET 521
27 Normal MOSFET Thermal conduction path 522
28 Power MOSFET 523
29 Power MOSFET Thermal conduction path 524
30 AB amplifier with power MOSFETs and BJT drivers 525
31 AB amplifier with power MOSFETs and BJT drivers V BE multiplier 526
32 AB amplifier with power MOSFETs and BJT drivers Push-pull darlington pairs 527
33 AB amplifier with power MOSFETs and BJT drivers CMOS power MOSFET output 528
34 AB amplifier with power MOSFETs and BJT drivers Quiescent point adjustment Temperature compensation adjustment Thermal feedback control 529
35 AB amplifier with power MOSFETs and BJT drivers Parasitic oscillation suppression 530
36 AB amplifier with power MOSFETs and BJT drivers 531
37 Filters and Tuned Amplifiers Ch
38 Two-port model of filter General response: Vo () s Ts () = V() s i 533
39 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: 534
40 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 ( ) 535
41 Ideal filter characteristics (Low-pass) 536
42 Ideal filter characteristics (High-pass) 537
43 Ideal filter characteristics (Band-pass) 538
44 Ideal filter characteristics (Band-stop) 539
45 Practical limitations (Low-pass) 540
46 Practical limitations (Low-pass) Zero-width transition band Infinite attenuation in stop-band 541
47 Practical limitations (Low-pass) Zero-width transition band Infinite attenuation in stop-band Infinite complexity Infinite time delay 542
48 Practical limitations (Low-pass) impulse response input x(t) = δ (t) t output y(t) = sinc(t) = sin(t) t t 543
49 Practical limitations (Low-pass) impulse response input x(t) = δ (t) t output Response precedes input!! y(t) = sinc(t) = sin(t) t t 544
50 Example Low-pass specification Pass-band edge Stop-band edge Pass-band variation Minimum stop-band attenuation - 545
51 Example Band-pass specification Pass-band variation Lower stop-band edge Pass-band edges Upper stop-band edge Minimum stop-band attenuation 546
52 Typical Low-pass specification Often no constraints on filter curve - 547
53 Typical Low-pass specification Often no constraints on filter curve Might be monotonic - 548
54 Typical Low-pass specification Often no constraints on filter curve May have passband ripple - 549
55 Typical Low-pass specification Often no constraints on filter curve May have stop band ripple - 550
56 Typical Low-pass specification Often no constraints on filter curve May have both passband and stopband ripple - 551
57 Typical Low-pass specification Many different approximations to the ideal filter response - 552
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