0195136047.pdf

7.2 DIODES 351

(b)

(c)

V

Vo VB

RL 1

Q Q^1

2

Q 3

Q 4

RL 1 < RL 2 < RL 3 < RL 4

VB

V

I

RL 2

RL 3

RL 4

0

0

IQ

VB

Load line

I = (VB − V)/RL

Slope = −1/RL

Device curve

Diode

voltage

Voltage

across

resistor

Load lines

0

Operating (quiescent) point

RL

I

RL

VB

V

I

(a)

+−

+−

Figure E7.2.5(a)Circuit of forward-biased diode.(b)Graphical analysis of forward-biased diode with load
resistance.(c)Graphical analysis for different values of load resistance.(d)Graphical analysis for different
values of supply voltage.(e)Diode circuit with dc and ac sources.(f)Small-signal current and voltage
waveforms.(g)Large-signal current and voltage waveforms.