Problem 1
a) Consider the circuit shown in the following figure. The value of R1 is reduced to R1= 10KΩ and
the cut- in voltage of the diode is Vᵞ=0.7V. Determine ID and VD.
b) Repeat part (a) if R1=50KΩ
Problem 2
The cut- in voltage of the diode shown in the circuit in the following figure is Vᵞ=0.7V. The diode
is remain biased ‘On’ for a power supply voltage in the range 5<=Vps<=10 V. The minimum diode
current is to be ID(min)=2 mA. The maximum power dissipated in the diode is to be no more than
10 mW. Determine appropriate values of R1 and R2.
Problem 3
The diode cut- in voltage is Vᵞ=0.7V in the four circuits shown in the following figure. Find I and
V0 in each of the circuits.
Problem 4
a) In the circuit shown in the figure, find the diode voltage VD and the supply voltage V such that
the current is ID= 0.4mA. Assume the diode cut- in voltage is Vᵞ=0.7V.
b) Using the results of part (a), determine the power dissipated in the diode.
Problem 5
Assume each diode in the circuit shown in the following figure has a cut- in voltage of Vᵞ=0.65V.
a) The input voltage is VI =5V. Determine the value of R1 required such that ID1 is one-half
the value of ID2. What are the values of ID1 and ID2?
b) If VI =8 V and R1 = 2KΩ, determine ID1 and ID2.
Problem 6
The
circuit
in
the
following
figure
is
a
complementary
output
rectifier.
If
Vs = 26 sin[ 2π (60)t ]V , sketch the output waveforms v0+ and v0- versus time, assuming Vᵞ=0.6
V for each diode.
Problem 7
Sketch v0 versus time for the circuit in the following figure. The input is a sine wave given by
vi = 10 sin ωt V. Assume Vᵞ=0 V.
Problem 8
Consider the circuit in the following figure. Let Vᵞ=0 V.
a) Plot vO versus input voltage vI over the range − 10V ≤ V I ≤ 10V
b) Plot iI over the same input voltage range as part (a).
Problem 9
For the circuit in the following figure,
a) plot v0 versus input voltage vI for 0 ≤ V I ≤ 15V . Assume Vᵞ=0.7 V. Indicate all breakpoints.
b) Plot iD over the same range of input voltage.
Problem 10
The diodes in the circuit in the following figure have piecewise linear parameters of Vᵞ=0.6 V and
γ f = 0 . Determine the output voltage V0 and the diode currents ID1 and ID2 for the following input
conditions.
a) V1 =10V, V2 = 0V.
b) V1 =5V, V2 = 0V.
c) V1 =10V, V2 = 5V.
d) V1 =10V, V2 = 10V.
Problem 11
Consider the circuit in the following figure. The output of a diode OR logic gate is connected to
the input of a second diode OR logic gate. Assume Vᵞ=0.6 V for each diode. Determine the outputs
VO1 and VO2 for:
a) V1 = V2 =0;
b) V1 = 5V, V2 = 0V;
c) V1 = V2 =5V.
What can be said about the relative values of VO1 and VO2 in their 'high' state?
Problem 12
Consider the circuit in the following figure. The output of a diode AND logic gate is connected to
the input of a second diode AND logic gate. Assume Vᵞ=0.6 V for each diode. Determine the
outputs V01 and VO2 for
a) V1 = V2 =5V.
b) V1 = 0V, V2 = 5 V;
c) V1 = V2 =0;
What can be said about the relative values of VO1 and VO2 in their 'low' state?
Problem 13
Sketch the steady-state output voltage v0 versus time for each circuit with the input voltage shown
in the following figure. Assume Vᵞ=0 V and assume the RC time constant is large.
Problem 14
For the circuit in the figure in Problem 13, let Vᵞ=0 V and v I = 10 sin ωt (steady state). Find
analytical expression for steady state v0 versus time and sketch for
a) VB= 0 V
b) VB= +3 V
c) VB= -3 V
Problem 15
Design a diode clamper to generate a steady-state output voltage v0 from the input voltage vI
shown in Figure P2.33 if Vᵞ=0.7 V.
Problem 16
a) Consider a pn junction diode biased at IDQ = 1mA. A sinusoidal voltage is superimposed on
VDQ such that the peak- to- peak sinusoidal current is 0.05IDQ . The diode ideality factor n=1. Find
the value of the applied peak-to-peak sinusoidal voltage.
b) Repeat part (a) if IDQ = 0.1 mA.
Problem 17
The diode in the circuit shown in the following figure is biased with a constant current source I.
The diode ideality factor n=1. A sinusoidal signal vs is coupled through Rs and C. Assume that C is
large so that it acts as a short circuit to the signal.
a) Show that the sinusoidal component of the diode voltage is given by v0 = vs (
b) If RS = 260 Ω , find v0 / vs , for I = 1mA, I = 0.1 mA, and I = 0.01 mA.
VT
)
VT + IRS