ECE-312 Electronic Circuits (A) Lecture #2
21
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
Transcript of ECE-312 Electronic Circuits (A) Lecture #2
Lecture #2 BJT Review Instructor: Dr. Ahmad El-Banna
Benha University Faculty of Engineering at Shoubra
Oc
to
ber
2014
ECE-312 Electronic Circuits (A)
© A
hmad
El-B
anna
Agenda
Transistor Construction & Operation
Transistor Configurations
Transistor Testing & Terminal Identification
2
ECE-
312
, Lec
#2 , O
ct 20
14
© A
hmad
El-B
anna
Transistor Construction
• Basic BJT Constructions
3
ECE-
312
, Lec
#2 , O
ct 20
14
• Basic BJT symbols and Currents
© A
hmad
El-B
anna
Transistor Operation
• Basic Operation using pnp transistor.
4
ECE-
312
, Lec
#2 , O
ct 20
14
• Majority and minority carrier flow of a pnp transistor.
• Biasing a transistor: (a) forward-bias (b) reverse-bias.
© A
hmad
El-B
anna
BJT CONFIGURATIONS
• Common Base
• Common Emitter
• Common Collector
5
© A
hmad
El-B
anna
EC
E-31
2 , L
ec#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 , O
ct 20
14
• Input or driving point characteristics for a common-base silicon transistor amplifier.
• Output or collector characteristics for a common-base transistor amplifier.
© A
hmad
El-B
anna
Configurations: Common Base..
• Formulas:
7
ECE-
312
, Lec
#2 , O
ct 20
14
• Biasing of a CB pnp tr. in the active region:
© A
hmad
El-B
anna
Configurations: Common Emitter
8
ECE-
312
, Lec
#2 , O
ct 20
14
• 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.
© A
hmad
El-B
anna
Configurations: Common Emitter..
9
ECE-
312
, Lec
#2 , O
ct 20
14
• Formulas:
• Biasing of a CE npn tr. in the active region:
© A
hmad
El-B
anna
Configurations: Common Collector
10
ECE-
312
, Lec
#2 , O
ct 20
14
• Notation and symbols used with the common-collector configuration: (a) pnp transistor; (b) npn transistor.
• Common-collector configuration used for impedance-matching purposes.
© A
hmad
El-B
anna
Configurations: Common Collector..
11
ECE-
312
, Lec
#2 , O
ct 20
14
• Defining the linear (undistorted) region of operation for a transistor.
• Formulas:
© A
hmad
El-B
anna
PRACTICAL VIEW
• Transistor Spec. Sheets
• Transistor Testing
• Transistor Casing and terminals identification
• Transistor Development
12
© A
hmad
El-B
anna
EC
E-31
2 , L
ec#2
, Oct
2014
Transistor Specification Sheets
13
ECE-
312
, Lec
#2 , O
ct 20
14
© A
hmad
El-B
anna
Transistor Specification Sheets..
14
ECE-
312
, Lec
#2 , O
ct 20
14
© A
hmad
El-B
anna
Transistor Testing using Curve Tracer
15
ECE-
312
, Lec
#2 , O
ct 20
14
• Check the beta value:
Curve tracer response to 2N3904 npn transistor.
© A
hmad
El-B
anna
Transistor Testing using Transistor Tester
16
ECE-
312
, Lec
#2 , O
ct 20
14
• Transistor testers: (a) digital meter (b) dedicated testers. ©
Ahm
ad E
l-Ban
na
Transistor Testing using Ohmmeter
17
ECE-
312
, Lec
#2 , O
ct 20
14
• Checking the forward-biased base-to-emitter junction of an npn transistor.
• Checking the reverse-biased base-to-collector junction of an npn transistor.
© A
hmad
El-B
anna
Transistor Casing
18
ECE-
312
, Lec
#2 , O
ct 20
14
• Various types of general-purpose or switching transistors: (a) low power (b) medium power (c) medium to high power.
© A
hmad
El-B
anna
Terminal Identification
19
ECE-
312
, Lec
#2 , O
ct 20
14
• 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.
© A
hmad
El-B
anna
Transistor Development
20
• Transistor IC count versus time for the period 1960 to the present
© A
hmad
El-B
anna
EC
E-31
2 , L
ec#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:
21
ECE-
312
, Lec
#2 , O
ct 20
14
© A
hmad
El-B
anna
