1 / 22

Output Stages and Power Amplifiers

November 5 2007. 1. Schedule. Due Friday, Nov 9 13.4,13.14,13.23,13.27Due Friday Nov. 1614.8,14.11,14.27,14.37Review Nov. 26Quiz 3: Nov 30Project Presentation Dec 3 and Dec 7. November 5 2007. 2. Introduction. Low output resistance to deliver power w/o loss, ie. efficiencyLinearity, ie. t

ilyssa
Download Presentation

Output Stages and Power Amplifiers

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    1. November 5 2007 0 Output Stages and Power Amplifiers Chapter 14 Classification of Output Stages Class A,B & AB Biasing AB Power BJT

    2. November 5 2007 1 Schedule Due Friday, Nov 9 13.4,13.14,13.23,13.27 Due Friday Nov. 16 14.8,14.11,14.27,14.37 Review Nov. 26 Quiz 3: Nov 30 Project Presentation Dec 3 and Dec 7

    3. November 5 2007 2 Introduction Low output resistance to deliver power w/o loss, ie. efficiency Linearity, ie. total harmonic distortion criteria Junction temperature and high power BJT Waveform shape?

    4. November 5 2007 3 Class A Output Stage Collector current waveform

    5. November 5 2007 4 Transfer Characteristic of Class A Emitter follower Q1 biased with constant current I supplied by Q2

    6. November 5 2007 5 Transfer characteristic of the emitter follower

    7. November 5 2007 6 Waveforms from Class A

    8. November 5 2007 7 Class B Conducts only half of the cycle

    9. November 5 2007 8 Power Dissipation Maximum instantaneous power in Q1 is VCCI. Emitter follower dissipated most power when vO = 0. If RL=0, short circuit, protection? Power conversion efficiency:

    10. November 5 2007 9 Power Efficiency Class B

    11. November 5 2007 10 Linearity Transfer characteristic for the class B output stage

    12. November 5 2007 11

    13. November 5 2007 12 Opamp Implementation

    14. November 5 2007 13 Class B Single Power Supply

    15. November 5 2007 14 Class AB Conduction more than half cycle

    16. November 5 2007 15 Class AB Conduction more than half cycle

    17. November 5 2007 16 Transfer Function Class AB

    18. November 5 2007 17 Determining Output Impedance Class AB

    19. November 5 2007 18 Class AB using Diodes

    20. November 5 2007 19 Class AB using V_BE multiplier

    21. November 5 2007 20 Class AB with V_be multip+pot.

    22. November 5 2007 21 Used in Radio frequency applications (mobile phones, radio and TV) Class C

More Related