Lab4 Report Instructions

The lab report should be segmented in 5 parts:
o Limiting circuit
o Half-wave rectifier
o Full-wave rectifier
o Ripple voltage circuit (voltage regulated power supply circuit)
o Limiting circuit with AC and DC

1)Limiting circuit:
o from preparation:
 find resistor value by approximation of circuit in figure 4-1
(V1=5V, Vf = 0.7V, Id=5mA), find diode voltage.
 find current and voltage in diode by running PSpice bias analysis.
 plot VI characteristic of diode by running DC sweep, and plot on
the same graph load line (trace load line equation), find current and
voltage of diode.
 plot transfer characteristic of circuit by running DC sweep,
describe (graph or sketch) the output waveform of +-5V triangle
wave.
 run transient analysis for circuit where V1 is +-5V triangle wave,
plot output.
 run transient analysis with Vsin (ampl=1mV, freq=1KHz) in series
with V1 (Id=IDC+iAC), plot output, build a piece-wise linear model
(Id=I0exp(V/nVT), n=1, VT=25mV).
 repeat the above transient analysis with Vsin (ampl=6mV,
freq=1KHz), plot output.
o from procedure:
 plot the VI characteristic for the diode obtained using
"iv_curve.vi".
 show diode's current and voltage obtained from experimental
measurements in lab for circuit in figure 4-1.

2)Half-wave rectifier:
o from preparation:
 find diode current value by approximation of circuit in figure 4-2
(use V1=5V, Vf = 0.7V, R1=3.3K), find diode voltage.
 find current and voltage in diode by running PSpice bias analysis.
 plot VI characteristic of diode by running DC sweep, and plot on
the same graph load line (trace load line equation), find current and
voltage of diode.

o
plot transfer characteristic of circuit by running DC sweep,
describe (graph or sketch) the output waveform of +-5V triangle
wave.
 run transient analysis for circuit where V1 is +-5V triangle wave,
plot output.
from procedure:
 plot the VI characteristic for the diode obtained using
"iv_curve.vi".
 show diode's current and voltage obtained from experimental
measurements in lab for circuit in figure 4-2.
 show output AC (rms & pp) and DC voltage values obtained from
experimental measurements in lab for circuit in figure 4-2 using
sine wave source (10V, 60Hz).

3)Full-wave rectifier:
o from preparation:
 plot transfer characteristic of circuit in figure 4-3 by running DC
sweep, describe (graph or sketch) the output waveform of 10V pp
sine wave input.
 run transient analysis for circuit in figure 4-3, plot output.
o from procedure:
 plot the transfer characteristic for circuit in figure 4-3 using
"transchar.vi".
 show output AC (rms & pp) and DC voltage values obtained from
experimental measurements in lab for circuit in figure 4-3 using
sine wave source (10V, 60Hz).
 show output pp voltage for same circuit after adding 1F capacitor
in parallel with 1K resistor and 10 resistor in series with any
diode, repeat with 10F and 100F.
 plot output waveform in 10resistor for 1F, 10F and 100F
cases.
o from analysis:
 what percentage of time are diodes conducting as seen in the
wavefront in zener diode, for all cases (1F, 10F and
100F).
 use PSpice to find output voltage for different capacitor values
including those in the procedure section, plot voltage vs. capacitor,
check if measured values agree with the plot.

4)Ripple voltage circuit (voltage regulated power supply circuit):
o from preparation:
 run transient analysis for circuit in figure 4-4 without load (only
capacitor, no resistor and zener diode), plot output.
 run transient analysis of circuit with load (capacitor plus resistor
and zener diode), find resistor value to obtain 10% less DC output
voltage, plot output.
o

from procedure:
 show the zener AC (rms & pp) and DC voltage values obtained
from experimental measurements in lab for circuit in figure 4-4,
use resistor box at 220K in parallel with zener diode.
 show resistor box reduced value to achieve 10% decrease in
output value.
5)Limiting Circuit with AC and DC:
o from procedure:
 show output AC (rms & pp) and DC current values obtained from
experimental measurements in lab for circuit in figure 4-5 for all
three cases: (0V, 0.5V, 0.7V DC).
o from analysis:
 analyze circuit in figure 4-5 using piecewise linear model to find
pp voltage, compare results with lab measurements.
written by Rayan Alassaad.