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ECE312_lec02
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Ahmad El-Banna
October 21, 2014
Education
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540
ECE312_lec02
3rd Year, Faculty of Eng. at Shoubra
lec#2, Electronic Circuits (A)
Ahmad El-Banna
October 21, 2014
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Transcript
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
Agenda Transistor Construction & Operation Transistor Configurations Transistor Testing &
Terminal Identification 2 ECE-312 , Lec#2 , Oct 2014 © Ahmad El-Banna
Transistor Construction • Basic BJT Constructions 3 ECE-312 , Lec#2
, Oct 2014 • Basic BJT symbols and Currents © Ahmad El-Banna
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
BJT CONFIGURATIONS • Common Base • Common Emitter • Common
Collector 5 © Ahmad El-Banna ECE-312 , Lec#2 , Oct 2014
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
Configurations: Common Base.. • Formulas: 7 ECE-312 , Lec#2 ,
Oct 2014 • Biasing of a CB pnp tr. in the active region: © Ahmad El-Banna
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
Configurations: Common Emitter.. 9 ECE-312 , Lec#2 , Oct 2014
• Formulas: • Biasing of a CE npn tr. in the active region: © Ahmad El-Banna
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
Configurations: Common Collector.. 11 ECE-312 , Lec#2 , Oct 2014
• Defining the linear (undistorted) region of operation for a transistor. • Formulas: © Ahmad El-Banna
PRACTICAL VIEW • Transistor Spec. Sheets • Transistor Testing •
Transistor Casing and terminals identification • Transistor Development 12 © Ahmad El-Banna ECE-312 , Lec#2 , Oct 2014
Transistor Specification Sheets 13 ECE-312 , Lec#2 , Oct 2014
© Ahmad El-Banna
Transistor Specification Sheets.. 14 ECE-312 , Lec#2 , Oct 2014
© Ahmad El-Banna
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
Transistor Testing using Transistor Tester 16 ECE-312 , Lec#2 ,
Oct 2014 • Transistor testers: (a) digital meter (b) dedicated testers. © Ahmad El-Banna
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
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
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
Transistor Development 20 • Transistor IC count versus time for
the period 1960 to the present © Ahmad El-Banna ECE-312 , Lec#2 , Oct 2014
• 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