Using%20Spice%20in%20Lab%20Practicing%20for%20Analog%20ASIC%20Design

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Using Spice in Lab Practicing for Analog ASIC
Design
2038 Analog integrated circuits

• Goran Jovanovic,
• Faculty of Electronic Engineering
• University of Niš
• Serbia and Montenegro

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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

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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.
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Content
2038 Analog integrated circuits

• 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

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Parts of Spice software (schematic, simulator
and wave-form viewer)
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.
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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

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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)
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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

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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
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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
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Content
2038 Analog integrated circuits

• 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

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First example Inverter (DC)
- Schematic editor is used for design entry. -
DC analysis setup and DC sweep setup is done.
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First example Inverter (DC)
DC simulation result Output voltage in term of
voltage V2
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First example Inverter (TRANSIENT)
- Schematic editor is used for inverter design
entry. - Transient analysis setup is done.
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First example Inverter (TRANSIENT)
Transient simulation result Input and output
voltage
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First example Inverter (TRANSIENT)
Transient simulation result Inverter power
consumption
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First example Inverter (AC)
- Schematic editor is used for inverter like
voltage amplifier design entry. - AC analysis
setup is done.
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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.
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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

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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.
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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.
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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

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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.
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Third example Delay Locked Loop
Classic Charge Pump circuit scheme
Four stages Voltage Controlled Delay Line circuit
scheme.
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Third example Delay Locked Loop
Hierarchical schema of DLL circuits shows
interconnection between components
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Control Voltage
Referent clock
Output clock
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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

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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.

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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

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References

• Avant!, Star-Hspice Manual, Release 1998.2, July
  1998
• OrCad, PSpice reference guide, 2000.
• San Jose State University, EE124 Web Site -
  Introduction to PSPICE, http//www.engr.sjsu.edu/e
  e124/p-intro.html