ECE312_lec02

3rd Year, Faculty of Eng. at Shoubra
lec#2, Electronic Circuits (A)

Transcript

1. Lecture #2 BJT Review Instructor: Dr. Ahmad El-Banna Benha University Faculty of Engineering at Shoubra October 2014 ECE-312 Electronic Circuits (A) © Ahmad El-Banna
2. Agenda Transistor Construction & Operation Transistor Configurations Transistor Testing & Terminal Identification 2 ECE-312 , Lec#2 , Oct 2014 © Ahmad El-Banna
3. Transistor Construction • Basic BJT Constructions 3 ECE-312 , Lec#2 , Oct 2014 • Basic BJT symbols and Currents © Ahmad El-Banna
4. Transistor Operation • Basic Operation using pnp transistor. 4 ECE-312 , Lec#2 , Oct 2014 • Majority and minority carrier flow of a pnp transistor. • Biasing a transistor: (a) forward-bias (b) reverse-bias. © Ahmad El-Banna
5. BJT CONFIGURATIONS • Common Base • Common Emitter • Common Collector 5 © Ahmad El-Banna ECE-312 , Lec#2 , Oct 2014
6. Configurations: Common Base • Notation and symbols used with the common-base configuration: (a) pnp transistor; (b) npn transistor. 6 ECE-312 , Lec#2 , Oct 2014 • Input or driving point characteristics for a common-base silicon transistor amplifier. • Output or collector characteristics for a common-base transistor amplifier. © Ahmad El-Banna
7. Configurations: Common Base.. • Formulas: 7 ECE-312 , Lec#2 , Oct 2014 • Biasing of a CB pnp tr. in the active region: © Ahmad El-Banna
8. Configurations: Common Emitter 8 ECE-312 , Lec#2 , Oct 2014 • Notation and symbols used with the common-emitter configuration: (a) pnp transistor (b) npn transistor. • Characteristics of a silicon transistor in the common- emitter configuration: (a) collector characteristics (b) base characteristics. © Ahmad El-Banna
9. Configurations: Common Emitter.. 9 ECE-312 , Lec#2 , Oct 2014 • Formulas: • Biasing of a CE npn tr. in the active region: © Ahmad El-Banna
10. Configurations: Common Collector 10 ECE-312 , Lec#2 , Oct 2014 • Notation and symbols used with the common-collector configuration: (a) pnp transistor; (b) npn transistor. • Common-collector configuration used for impedance-matching purposes. © Ahmad El-Banna
11. Configurations: Common Collector.. 11 ECE-312 , Lec#2 , Oct 2014 • Defining the linear (undistorted) region of operation for a transistor. • Formulas: © Ahmad El-Banna
12. PRACTICAL VIEW • Transistor Spec. Sheets • Transistor Testing • Transistor Casing and terminals identification • Transistor Development 12 © Ahmad El-Banna ECE-312 , Lec#2 , Oct 2014
13. Transistor Specification Sheets 13 ECE-312 , Lec#2 , Oct 2014 © Ahmad El-Banna
14. Transistor Specification Sheets.. 14 ECE-312 , Lec#2 , Oct 2014 © Ahmad El-Banna
15. Transistor Testing using Curve Tracer 15 ECE-312 , Lec#2 , Oct 2014 • Check the beta value: Curve tracer response to 2N3904 npn transistor. © Ahmad El-Banna
16. Transistor Testing using Transistor Tester 16 ECE-312 , Lec#2 , Oct 2014 • Transistor testers: (a) digital meter (b) dedicated testers. © Ahmad El-Banna
17. Transistor Testing using Ohmmeter 17 ECE-312 , Lec#2 , Oct 2014 • Checking the forward- biased base-to-emitter junction of an npn transistor. • Checking the reverse- biased base-to-collector junction of an npn transistor. © Ahmad El-Banna
18. Transistor Casing 18 ECE-312 , Lec#2 , Oct 2014 • Various types of general-purpose or switching transistors: (a) low power (b) medium power (c) medium to high power. © Ahmad El-Banna
19. Terminal Identification 19 ECE-312 , Lec#2 , Oct 2014 • Transistor terminal identification. • Internal construction of a Fairchild transistor in a TO-92 package. • Type Q2T2905 Texas Instruments quad pnp silicon transistor: (a) Appearance (b) pin connections. © Ahmad El-Banna
20. Transistor Development 20 • Transistor IC count versus time for the period 1960 to the present © Ahmad El-Banna ECE-312 , Lec#2 , Oct 2014
21. • For more details, refer to: • Chapter 3 at R. Boylestad, Electronic Devices and Circuit Theory, 11th edition, Prentice Hall. • Text books for ECE-121. • The lecture is available online at: • https://speakerdeck.com/ahmad_elbanna • For inquires, send to: • ahmad.elbanna@fes.bu.edu.eg • ahmad.elbanna@ejust.edu.eg 21 ECE-312 , Lec#2 , Oct 2014 © Ahmad El-Banna