1. Using Spice in Lab Practicing for Analog ASIC Design Goran Jovanović, Faculty of Electronic Engineering University of Niš Serbia and Montenegro

2. Content Introduction Introduction Parts of Spice software (schematic, simulator and wave-form viewer) Parts of Spice software (schematic, simulator and wave-form viewer) Spice software on market and making choice Spice software on market and making choice Library models and design rules for select technology Library models and design rules for select technology First example: DC, Transient, AC simulation of CMOS Inverter First example: DC, Transient, AC simulation of CMOS Inverter Second example: Parametric simulation of Inverter like Voltage Controlled Delay Line Second example: Parametric simulation of Inverter like Voltage Controlled Delay Line Third example: Delay Locked Loop Third example: Delay Locked Loop Conclusion Conclusion References References

3. 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.

4. Content Introduction Introduction Parts of Spice software (schematic, simulator and wave-form viewer) Parts of Spice software (schematic, simulator and wave-form viewer) Spice software on market and making choice Spice software on market and making choice Library models and design rules for select technology Library models and design rules for select technology First example: DC, Transient, AC simulation of CMOS Inverter First example: DC, Transient, AC simulation of CMOS Inverter Second example: Parametric simulation of Inverter like Voltage Controlled Delay Line Second example: Parametric simulation of Inverter like Voltage Controlled Delay Line Third example: Delay Locked Loop Third example: Delay Locked Loop Conclusion Conclusion References References

5. 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.

6. Content Introduction Introduction Parts of Spice software description (schematic, simulator and wave-form viewer) Parts of Spice software description (schematic, simulator and wave-form viewer) Spice software on market and making choice Spice software on market and making choice Library models and design rules for select technology Library models and design rules for select technology First example: DC, Transient, AC simulation of CMOS Inverter First example: DC, Transient, AC simulation of CMOS Inverter Second example: Parametric simulation of Inverter like Voltage Controlled Delay Line Second example: Parametric simulation of Inverter like Voltage Controlled Delay Line Third example: Delay Locked Loop Third example: Delay Locked Loop Conclusion Conclusion References References

7. 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). schematic, simulator and a wave-form viewer PSpice has friendly shell with all three parts of the software (schematic, simulator and a wave-form viewer)

8. Content Introduction Introduction Parts of Spice software description (schematic, simulator and wave-form viewer) Parts of Spice software description (schematic, simulator and wave-form viewer) Spice software on market and making choice Spice software on market and making choice Library models and design rules for select technology Library models and design rules for select technology First example: DC, Transient, AC simulation of CMOS Inverter First example: DC, Transient, AC simulation of CMOS Inverter Second example: Parametric simulation of Inverter like Voltage Controlled Delay Line Second example: Parametric simulation of Inverter like Voltage Controlled Delay Line Third example: Delay Locked Loop Third example: Delay Locked Loop Conclusion Conclusion References References

9. For present student practice it was used library models, level 6, for CMOS 1.2  m double-metal double-poly technology

10. 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

11. Content Introduction Introduction Parts of Spice software description (schematic, simulator and wave-form viewer) Parts of Spice software description (schematic, simulator and wave-form viewer) Spice software on market and making choice Spice software on market and making choice Library models and design rules for select technology Library models and design rules for select technology First example: DC, Transient and AC simulation of CMOS Inverter First example: DC, Transient and AC simulation of CMOS Inverter Second example: Parametric simulation of Inverter like Voltage Controlled Delay Line Second example: Parametric simulation of Inverter like Voltage Controlled Delay Line Third example: Delay Locked Loop Third example: Delay Locked Loop Conclusion Conclusion References References

12. - Schematic editor is used for design entry. - DC analysis setup and DC sweep setup is done.

13. DC simulation result: Output voltage in term of voltage V 2

14. - Schematic editor is used for inverter design entry. - Transient analysis setup is done.

15. Transient simulation result: Input and output voltage

16. Transient simulation result: Inverter power consumption

17. - Schematic editor is used for inverter like voltage amplifier design entry. - AC analysis setup is done.

18. 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.

19. Content Introduction Introduction Parts of Spice software (schematic, simulator and wave-form viewer) Parts of Spice software (schematic, simulator and wave-form viewer) Spice software on market and making choice Spice software on market and making choice Library models and design rules for select technology Library models and design rules for select technology First example: DC, Transient, AC simulation of CMOS Inverter First example: DC, Transient, AC simulation of CMOS Inverter Second example: Parametric simulation of Inverter like Voltage Controlled Delay Line Second example: Parametric simulation of Inverter like Voltage Controlled Delay Line Third example: Delay Locked Loop Third example: Delay Locked Loop Conclusion Conclusion References References

20. Circuit propagation delay time simulation for inverter with current supply. Parameter is value of V 3 voltage source.

21. Parametric transient simulation result: Input and output voltage of delay line for different value of voltage V 3 like parameter.

22. Content Introduction Introduction Parts of Spice software (schematic, simulator and wave-form viewer) Parts of Spice software (schematic, simulator and wave-form viewer) Spice software on market and making choice Spice software on market and making choice Library models and design rules for select technology Library models and design rules for select technology First example: DC, Transient, AC simulation of CMOS Inverter First example: DC, Transient, AC simulation of CMOS Inverter Second example: Parametric simulation of Inverter like Voltage Controlled Delay Line Second example: Parametric simulation of Inverter like Voltage Controlled Delay Line Third example: Delay Locked Loop Third example: Delay Locked Loop Conclusion Conclusion References References

23. 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.

24. Classic Charge Pump circuit scheme Four stages Voltage Controlled Delay Line circuit scheme.

25. Hierarchical schema of DLL circuits shows interconnection between components

26. Control Voltage Referent clock Outpu t clock

27. Content Introduction Introduction Parts of Spice software description (schematic, simulator and wave-form viewer) Parts of Spice software description (schematic, simulator and wave-form viewer) Spice software on market and making choice Spice software on market and making choice Library models and design rules for select technology Library models and design rules for select technology First example: DC, Transient, AC simulation of CMOS Inverter First example: DC, Transient, AC simulation of CMOS Inverter Second example: Parametric simulation of Inverter like Voltage Controlled Delay Line Second example: Parametric simulation of Inverter like Voltage Controlled Delay Line Third example: Delay Locked Loop Third example: Delay Locked Loop Conclusion Conclusion References References

28. 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, 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, 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.

29. Content Introduction Introduction Parts of Spice software description (schematic, simulator and wave-form viewer) Parts of Spice software description (schematic, simulator and wave-form viewer) Spice software on market and making choice Spice software on market and making choice Library models and design rules for select technology Library models and design rules for select technology First example: DC, Transient, AC simulation of CMOS Inverter First example: DC, Transient, AC simulation of CMOS Inverter Second example: Parametric simulation of Inverter like Voltage Controlled Delay Line Second example: Parametric simulation of Inverter like Voltage Controlled Delay Line Third example: Delay Locked Loop Third example: Delay Locked Loop Conclusion Conclusion References References

30. 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.htmlhttp://www.engr.sjsu.edu/ee124/p-intro.html