User Guide

2
-
4 Primer: How to Optimize a Desi
g
n
Phase One: Developin
g
the Desi
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n
Before optimizing, you must have a working circuit. This means
first drawing the schematic, then iteratively simulating with
PSpice and adjusting the design until the circuit operates with
the intended behavior.
Fi
g
ure 2-2
“Phase One: Developing the Design” Design
Flow
To draw the schematic for the diode biasin
g
desi
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n
1
In Schematics, from the Draw menu, use Get New Part to
select and place the following symbols on the schematic:
R resistor R1
D1N914 diode D1
VSRC voltage source V1
AGND analog ground 0
Phase 1 is also the time to
investi
g
ate:
• The effects of individual
components by replacin
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component values with
parameters or parameterized
expressions.
• Usin
g
PSpice to perform a
DC, AC, or parametric sweep
of each parameterized value.
Desi
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n
Schematic
Simulate
MicroSim
Schematics
MicroSim
PSpice A/D
Note
When you initially place
resistor R1, its value is 1k.
Later, when you set up the
optimization, you will
parameterize R1’s value as
shown in Fi
g
ure 2-1.