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UCSD Physics 121 Lecture 8: Electronics Overview - Diodes, Zener Diodes, and Transistors, Lecture notes of Experimental Techniques

University of California - Los Angeles (UCLA)Experimental Techniques

A portion of the lecture notes from ucsd's physics 121 course during winter 2011. The notes cover topics such as diodes, zener diodes, and transistors. Diagrams and explanations of concepts like diode symbols, p-type and n-type semiconductors, and the operation of zener diodes and transistors. Students can use these notes to study for exams, quizzes, or assignments related to electronics and semiconductor physics.

Typology: Lecture notes

2011/2012

Uploaded on 01/17/2012

lana87
lana87 🇺🇸

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Electronics Overview 02/12/2008
Lecture 8 1
diode bridge
Winter 2011
UCSD: Physics 121; 2011
2
Winter 2011
UCSD: Physics 121; 2011
3
€
1
C
Idt
∫
€
1
Xtot
=1
X1
+1
X2
+1
X3
+…
Winter 2011
UCSD: Physics 121; 2011
4
1
2
3
R1
R2
V Vout
pf3
pf4
pf5
pf8
pf9

Partial preview of the text

Download UCSD Physics 121 Lecture 8: Electronics Overview - Diodes, Zener Diodes, and Transistors and more Lecture notes Experimental Techniques in PDF only on Docsity!

diode bridge

Winter 2011 UCSD: Physics 121; 2011 2 Winter 2011 UCSD: Physics 121; 2011 3 € 1 C ∫ Idt € 1 Xtot = 1 X 1

  • 1 X 2
  • 1 X 3
  • … Winter 2011 UCSD: Physics 121; 2011 4 1 2 3 R 1 R 2 V V out

Winter 2011 UCSD: Physics 121; 2011 5 V R Winter 2011 UCSD: Physics 121; 2011 6 A B A’ CT B’ AC input (^) AC output Winter 2011 UCSD: Physics 121; 2011 7

V

I

V

I

V

I

V

I

0.6 V

plain resistor diode idealized diode WAY idealized diode no current flows current flows

the direction the

arrow points in the

diode symbol is the

direction that current

will flow

acts just like a wire

(will support arbitrary

current) provided that

voltage is positive

Winter 2011 UCSD: Physics 121; 2011 8 p -type n -type

Winter 2011 UCSD: Physics 121; 2011 13 A C B D AC source load capacitor Winter 2011 UCSD: Physics 121; 2011 14 C R V Winter 2011 UCSD: Physics 121; 2011 15 1 2 3 R 1 R 2 V in V out R load Winter 2011 UCSD: Physics 121; 2011 16 R 1 Z V in V out = V z R load

zener voltage

high slope is what makes the

zener a decent voltage regulator

Winter 2011 UCSD: Physics 121; 2011 17 note zeners Winter 2011 UCSD: Physics 121; 2011 18

beware that housing is not always ground

Winter 2011 UCSD: Physics 121; 2011 19 B C E B E C npn pnp Winter 2011 UCSD: Physics 121; 2011 20

out

Rc

Rb

in

Vcc

B C E

Winter 2011 UCSD: Physics 121; 2011 25 from: http://www.maxim-ic.com/appnotes.cfm/appnote_number/ The FET switch is turned off or on in a pulse-width-modulation (PWM) scheme, the duty cycle of which determines the ratio of V out to V in Winter 2011 UCSD: Physics 121; 2011 26 Winter 2011 UCSD: Physics 121; 2011 27

FET

Inductor Current Supply Current Capacitor Current Output Voltage (ripple exag.) Winter 2011 UCSD: Physics 121; 2011 28

Winter 2011 UCSD: Physics 121; 2011 29 Winter 2011 UCSD: Physics 121; 2011 30 R ωL Z Zr Zi 1/ωC real axis imag. axis Winter 2011 UCSD: Physics 121; 2011 31 input (^) L C output Winter 2011 UCSD: Physics 121; 2011 32