1. 1 Electronic Circuits AMPLIFIERS

2. 2 Demostrate Transistor Amplification Determine Transistor Biasing. Explain Transistor Regions - Emitter, Base, Collector. Explore Transistors as Switches Objectives Electronic Circuits

3. 3 Amplifier Out In Gain = In Out Electronic Circuits

4. 4 N P N The collector is lightly doped. C The base is thin and is lightly doped. B The emitter is heavily doped. E NPN Transistor Structure Electronic Circuits

5. 5 The C-B junction is reverse biased. N P N NPN Transistor Bias C B E No current flows. Electronic Circuits

6. 6 The B-E junction is forward biased. N P N NPN Transistor Bias C B E Current flows. Electronic Circuits

7. 7 When both junctions are biased.... N P N NPN Transistor Bias C B E Current flows everywhere. Most of the emitter carriers diffuse through the thin base region since they are attracted by the collector. Note that I B is smaller than I E or I C. ICIC IBIB IEIE Electronic Circuits

8. 8 N P N C B E Although I B is smaller it controls I E and I C. ICIC IBIB IEIE Note: when the switch opens, all currents go to zero. Gain is something small controlling something large (I B is small). Electronic Circuits

9. 9 Amplifier Out In Gain = In Out Electronic Circuits

10. 10 The C-B junction is reverse biased. N P N NPN Transistor Bias C B E No current flows. Electronic Circuits

11. 11 The B-E junction is forward biased. N P N NPN Transistor Bias C B E Current flows. Electronic Circuits

12. 12 When both junctions are biased.... N P N NPN Transistor Bias C B E Current flows everywhere. Most of the emitter carriers diffuse through the thin base region since they are attracted by the collector. Note that I B is smaller than I E or I C. ICIC IBIB IEIE Electronic Circuits

13. 13 N P N C B E Although I B is smaller it controls I E and I C. ICIC IBIB IEIE Note: when the switch opens, all currents go to zero. Gain is something small controlling something large (I B is small). Electronic Circuits

14. 14 Transistor Structure and Bias Quiz The heaviest doping is found in the ___________ region. emitter The thinnest of all three regions is called the ____________. base The collector-base junction is ___________ biased. reverse The base-emitter junction is ____________ biased. forward The majority of the emitter carriers flow to the ___________. collector Electronic Circuits