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2038 Analog integrated circuits
Using Spice in Lab
Practicing for Analog
ASIC Design
Goran Jovanović,
Faculty of Electronic Engineering
University of Niš
Serbia and Montenegro
2038 Analog integrated circuits
Content
 Introduction
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Parts of Spice software (schematic, simulator and wave-form viewer)
Spice software on market and making choice
Library models and design rules for select technology
First example: DC, Transient, AC simulation of CMOS Inverter
Second example: Parametric simulation of Inverter like Voltage
Controlled Delay Line
Third example: Delay Locked Loop
Conclusion
References
Introduction
SPICE (Simulation Program with Integrated Circuit
Emphasis) was introduced in May 1972 by the
University of Berkeley, California.
It soon became a standard for electronic circuit
simulation, used by both, the industry and the
universities.
This fact is based on the technical expertise of the
developers of SPICE: especially Prof. Pederson,
and Prof. Nagel.
2038 Analog integrated circuits
Content

Introduction
 Parts
of Spice software (schematic, simulator
and wave-form viewer)







Spice software on market and making choice
Library models and design rules for select technology
First example: DC, Transient, AC simulation of CMOS Inverter
Second example: Parametric simulation of Inverter like Voltage
Controlled Delay Line
Third example: Delay Locked Loop
Conclusion
References
Parts of Spice software
(schematic, simulator and wave-form viewer)
Design Entry
Schematic
Text editor
Net list
Simulation
Wave-Form Viewer
view simulation
results
print simulation
results
Design entry can be generated by textual
or schematic editor.
When the simulator finish its job, results is
an output binary or an ascii file. For view
or print simulation results is used software
named as wave-form viewer.
2038 Analog integrated circuits
Content


Introduction
Parts of Spice software description (schematic, simulator and
wave-form viewer)
 Spice






software on market and making choice
Library models and design rules for select technology
First example: DC, Transient, AC simulation of CMOS Inverter
Second example: Parametric simulation of Inverter like Voltage
Controlled Delay Line
Third example: Delay Locked Loop
Conclusion
References
Spice software on market and making choice
There are many Spice software in the marked:
Star-Spice, Smart-Spice, Tanner T-Spice, PSpice, Intuisoft Spice,…
The professional analog designer in the most company use Synario
HSpice also named like Star-Spice. This software has a superior
mathematical solution and the “gold” accurate simulation.
A software for Student practice must be free and easy available. In
category of free Spice software good choice is PSpice (evaluation
student version).
PSpice has friendly shell with all three parts of the software (schematic,
simulator and a wave-form viewer)
2038 Analog integrated circuits
Content



Introduction
Parts of Spice software description (schematic, simulator and
wave-form viewer)
Spice software on market and making choice
 Library
models and design rules for select
technology





First example: DC, Transient, AC simulation of CMOS Inverter
Second example: Parametric simulation of Inverter like Voltage
Controlled Delay Line
Third example: Delay Locked Loop
Conclusion
References
Library models and design rules for select
technology
For present
student practice it
was used library
models, level 6,
for CMOS 1.2mm
double-metal
double-poly
technology
Library models and design rules for select
technology
MOS transistors attributes like:
L - channel length
W - channel width
AD, AS - drain & source diffusion area
PD, PS - drain & source diffusion
perimeters
NRx – relative resistance of drain,…
…
mast be set with respect of design
rules for this technology
2038 Analog integrated circuits
Content




Introduction
Parts of Spice software description (schematic, simulator and
wave-form viewer)
Spice software on market and making choice
Library models and design rules for select technology
 First
example: DC, Transient and AC
simulation of CMOS Inverter




Second example: Parametric simulation of Inverter like Voltage
Controlled Delay Line
Third example: Delay Locked Loop
Conclusion
References
First example: Inverter (DC)
- Schematic editor is used for design entry.
- DC analysis setup and DC sweep setup is done.
First example: Inverter (DC)
DC simulation result: Output voltage in term of voltage V2
First example: Inverter (TRANSIENT)
- Schematic editor is used for inverter design entry.
- Transient analysis setup is done.
First example: Inverter (TRANSIENT)
Transient simulation result: Input and output voltage
First example: Inverter (TRANSIENT)
Transient simulation result: Inverter power consumption
First example: Inverter (AC)
- Schematic editor is used for inverter like voltage amplifier design entry.
- AC analysis setup is done.
First example: Inverter (AC)
AC simulation result:
Inverter amplifying [dB] in term of input frequency.
Second probe cursor display maximal amplifying 27dB and
first cursor display upper cutoff frequency at 595MHz.
2038 Analog integrated circuits
Content





Introduction
Parts of Spice software (schematic, simulator and wave-form
viewer)
Spice software on market and making choice
Library models and design rules for select technology
First example: DC, Transient, AC simulation of CMOS Inverter
 Second
example: Parametric simulation of
Inverter like Voltage Controlled Delay Line



Third example: Delay Locked Loop
Conclusion
References
Second example: Parametric simulation of
Inverter like Voltage Controlled Delay Line
Circuit propagation
delay time
simulation for
inverter with
current supply.
Parameter is value
of V3 voltage
source.
Second example: Parametric simulation of
Inverter like Voltage Controlled Delay Line
Parametric transient simulation result: Input and output voltage
of delay line for different value of voltage V3 like parameter.
2038 Analog integrated circuits
Content






Introduction
Parts of Spice software (schematic, simulator and wave-form
viewer)
Spice software on market and making choice
Library models and design rules for select technology
First example: DC, Transient, AC simulation of CMOS Inverter
Second example: Parametric simulation of Inverter like Voltage
Controlled Delay Line



Third example: Delay Locked Loop
Conclusion
References
Third example: Delay Locked Loop
Also, Spice software can be used
for simulation of some complex
circuits like DLL.
Complete DLL circuits is
consisted from:
phase detector,
charge pump,
LP filter and
voltage controlled delay
line.
Phase detector who is implemented like
True Single Phase Logic circuits.
Third example: Delay Locked Loop
Classic Charge Pump circuit scheme
Four stages
Voltage Controlled
Delay Line circuit
scheme.
Third example: Delay Locked Loop
Hierarchical schema of
DLL circuits shows
interconnection
between components
VCDL
CLKin
DC1 DC2 DC3
LP
filter
DCn
phase
detector
current
pum p
up
down
Control
Voltage
Referent
clock
Outpu
t clock
2038 Analog integrated circuits
Content







Introduction
Parts of Spice software description (schematic, simulator and
wave-form viewer)
Spice software on market and making choice
Library models and design rules for select technology
First example: DC, Transient, AC simulation of CMOS Inverter
Second example: Parametric simulation of Inverter like Voltage
Controlled Delay Line
Third example: Delay Locked Loop
 Conclusion

References
Conclusion
After six years experience of using PSpice software
in a laboratory practice, I can note:
students (an absolutely beginners) can 15 minutes after
introduce time to start with an independent work,
 45 minutes after, students usually finish their first
simulation,

Friendly environment enables short training time
and a clearly presentation of design structure and
simulation results.
2038 Analog integrated circuits
Content








Introduction
Parts of Spice software description (schematic, simulator and
wave-form viewer)
Spice software on market and making choice
Library models and design rules for select technology
First example: DC, Transient, AC simulation of CMOS Inverter
Second example: Parametric simulation of Inverter like Voltage
Controlled Delay Line
Third example: Delay Locked Loop
Conclusion
 References
References
1. Avant!, Star-Hspice Manual, Release 1998.2, July 1998
2. OrCad, PSpice reference guide, 2000.
3. San Jose State University, EE124 Web Site - Introduction
to PSPICE, http://www.engr.sjsu.edu/ee124/p-intro.html