electronics1 - vili.pmmf.huvili.pmmf.hu/~fuzi/electronics1/en1l06.pdf · multistage dc amplifier...
TRANSCRIPT
![Page 1: Electronics1 - vili.pmmf.huvili.pmmf.hu/~fuzi/Electronics1/En1L06.pdf · Multistage DC amplifier with direct coupling. Coupling of amplifier stages Inductive (via signal transformer)-only](https://reader031.vdocuments.net/reader031/viewer/2022020206/5cdf05d588c9938b288d8ef0/html5/thumbnails/1.jpg)
Electronics 1
Lecture 6
Multistage Amplifiers, Interstage Coupling, Feedback Tuned Amplifiers
Literature1. Tietze U, Schenk Ch: Electronic Circuits – Handbook for Design and Applications,
Springer, 2008, ISBN: 35400042972. Horowitz, Hill W: The Art of Electronics, Cambridge University Press, 1989,
ISBN: 0521370957
![Page 2: Electronics1 - vili.pmmf.huvili.pmmf.hu/~fuzi/Electronics1/En1L06.pdf · Multistage DC amplifier with direct coupling. Coupling of amplifier stages Inductive (via signal transformer)-only](https://reader031.vdocuments.net/reader031/viewer/2022020206/5cdf05d588c9938b288d8ef0/html5/thumbnails/2.jpg)
Coupling of amplifier stages
Direct coupling- both DC and AC components of the input signal are amplified- biasing of individual stages influence each other
Capacitive- only the AC components of the input signal are amplified- biasing of individual stages are independent
Inductive (via signal transformer)- only the AC components of the input signal are amplified- biasing design must take into account the fact that coils have very low DC resistance
![Page 3: Electronics1 - vili.pmmf.huvili.pmmf.hu/~fuzi/Electronics1/En1L06.pdf · Multistage DC amplifier with direct coupling. Coupling of amplifier stages Inductive (via signal transformer)-only](https://reader031.vdocuments.net/reader031/viewer/2022020206/5cdf05d588c9938b288d8ef0/html5/thumbnails/3.jpg)
Coupling of amplifier stages
Direct coupling- both DC and AC components of the input signal are amplified- biasing of individual stages influence each other
Differential common emitter common collectorinput stage voltage amplifier power stage
Multistage DC amplifier with direct coupling
![Page 4: Electronics1 - vili.pmmf.huvili.pmmf.hu/~fuzi/Electronics1/En1L06.pdf · Multistage DC amplifier with direct coupling. Coupling of amplifier stages Inductive (via signal transformer)-only](https://reader031.vdocuments.net/reader031/viewer/2022020206/5cdf05d588c9938b288d8ef0/html5/thumbnails/4.jpg)
Coupling of amplifier stages
Inductive (via signal transformer)- only the AC components of the input signal are amplified- biasing design must take into account the fact that coils have very low DC resistance
Class B push-pull amplifier with induvtive coupling
Class A amplifier with capacitive input and inductive output coupling
![Page 5: Electronics1 - vili.pmmf.huvili.pmmf.hu/~fuzi/Electronics1/En1L06.pdf · Multistage DC amplifier with direct coupling. Coupling of amplifier stages Inductive (via signal transformer)-only](https://reader031.vdocuments.net/reader031/viewer/2022020206/5cdf05d588c9938b288d8ef0/html5/thumbnails/5.jpg)
The principle of feedback
![Page 6: Electronics1 - vili.pmmf.huvili.pmmf.hu/~fuzi/Electronics1/En1L06.pdf · Multistage DC amplifier with direct coupling. Coupling of amplifier stages Inductive (via signal transformer)-only](https://reader031.vdocuments.net/reader031/viewer/2022020206/5cdf05d588c9938b288d8ef0/html5/thumbnails/6.jpg)
Negative series voltage feedback
![Page 7: Electronics1 - vili.pmmf.huvili.pmmf.hu/~fuzi/Electronics1/En1L06.pdf · Multistage DC amplifier with direct coupling. Coupling of amplifier stages Inductive (via signal transformer)-only](https://reader031.vdocuments.net/reader031/viewer/2022020206/5cdf05d588c9938b288d8ef0/html5/thumbnails/7.jpg)
Negative series voltage feedback
Two-stage common emitter amplifier with negative series voltage feedback
![Page 8: Electronics1 - vili.pmmf.huvili.pmmf.hu/~fuzi/Electronics1/En1L06.pdf · Multistage DC amplifier with direct coupling. Coupling of amplifier stages Inductive (via signal transformer)-only](https://reader031.vdocuments.net/reader031/viewer/2022020206/5cdf05d588c9938b288d8ef0/html5/thumbnails/8.jpg)
Negative series current feedback
![Page 9: Electronics1 - vili.pmmf.huvili.pmmf.hu/~fuzi/Electronics1/En1L06.pdf · Multistage DC amplifier with direct coupling. Coupling of amplifier stages Inductive (via signal transformer)-only](https://reader031.vdocuments.net/reader031/viewer/2022020206/5cdf05d588c9938b288d8ef0/html5/thumbnails/9.jpg)
Negative series current feedback
Common emitter amplifier without emitter resistance bypass
![Page 10: Electronics1 - vili.pmmf.huvili.pmmf.hu/~fuzi/Electronics1/En1L06.pdf · Multistage DC amplifier with direct coupling. Coupling of amplifier stages Inductive (via signal transformer)-only](https://reader031.vdocuments.net/reader031/viewer/2022020206/5cdf05d588c9938b288d8ef0/html5/thumbnails/10.jpg)
Tuned amplifiers Applied at high frequencies. Gain is strongly reduced out of the vicinity of the resonance frequency.Bandwidth: the limit of 3dB gain decrease.
Real oscillator circuit. Series-parallel equivalence
00 ps QQ
sp Cr
LR
![Page 11: Electronics1 - vili.pmmf.huvili.pmmf.hu/~fuzi/Electronics1/En1L06.pdf · Multistage DC amplifier with direct coupling. Coupling of amplifier stages Inductive (via signal transformer)-only](https://reader031.vdocuments.net/reader031/viewer/2022020206/5cdf05d588c9938b288d8ef0/html5/thumbnails/11.jpg)
Tuned amplifiersIn case of common emitter tuned amplifier the collector impedance is an oscillator circuit, therefore the gain is strongly frequency dependent.
gm 10…500 mS : transistor transconductance (DiC /DuB h21 / h11)1/h22 10…100 k : transistor output resistance1/h22 >> Rt
![Page 12: Electronics1 - vili.pmmf.huvili.pmmf.hu/~fuzi/Electronics1/En1L06.pdf · Multistage DC amplifier with direct coupling. Coupling of amplifier stages Inductive (via signal transformer)-only](https://reader031.vdocuments.net/reader031/viewer/2022020206/5cdf05d588c9938b288d8ef0/html5/thumbnails/12.jpg)
Coupling of tuned amplifier stages
Sinchronous tuning Staggered tuning
![Page 13: Electronics1 - vili.pmmf.huvili.pmmf.hu/~fuzi/Electronics1/En1L06.pdf · Multistage DC amplifier with direct coupling. Coupling of amplifier stages Inductive (via signal transformer)-only](https://reader031.vdocuments.net/reader031/viewer/2022020206/5cdf05d588c9938b288d8ef0/html5/thumbnails/13.jpg)
Coupling of tuned amplifier stages
Effect of coupling constant on a two-stage tuned amplifier
Oscillator circuit coupling
![Page 14: Electronics1 - vili.pmmf.huvili.pmmf.hu/~fuzi/Electronics1/En1L06.pdf · Multistage DC amplifier with direct coupling. Coupling of amplifier stages Inductive (via signal transformer)-only](https://reader031.vdocuments.net/reader031/viewer/2022020206/5cdf05d588c9938b288d8ef0/html5/thumbnails/14.jpg)
Coupling of tuned amplifier stages
The first mass production transistor radio receiver (1954)
![Page 15: Electronics1 - vili.pmmf.huvili.pmmf.hu/~fuzi/Electronics1/En1L06.pdf · Multistage DC amplifier with direct coupling. Coupling of amplifier stages Inductive (via signal transformer)-only](https://reader031.vdocuments.net/reader031/viewer/2022020206/5cdf05d588c9938b288d8ef0/html5/thumbnails/15.jpg)
Common base radiofrequency amplifier