Help Me Simulate Circuit & Get Graph of V Marks vs Time

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SUMMARY

This discussion focuses on simulating a circuit involving zener diodes with specific reverse and forward biased voltages of 9.1V and 1.2V, respectively. The user encountered issues visualizing the voltage versus time graph during simulation using MicroCAP SPICE, with a mention that PSPICE may offer similar functionality. The user corrected the resistor configuration, noting R2 as 10k and R3 as 20.6k. For modeling, the discussion references "Semiconductor Device Modelling with SPICE" by Antognetti and Massobrio for creating a macromodel that incorporates both forward and reverse bias conditions.

PREREQUISITES
  • Understanding of zener diode characteristics and configurations
  • Familiarity with MicroCAP SPICE and PSPICE simulation tools
  • Knowledge of circuit schematic design and analysis
  • Basic principles of semiconductor device modeling
NEXT STEPS
  • Research how to set up zener diode models in MicroCAP SPICE
  • Explore voltage versus time graphing techniques in PSPICE
  • Study "Semiconductor Device Modelling with SPICE" by Antognetti and Massobrio
  • Investigate application notes and help resources on the PSPICE website
USEFUL FOR

Electronics engineers, circuit designers, and students involved in circuit simulation and modeling, particularly those working with zener diodes and SPICE tools.

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Hi guys, I'm having a problem simulating the following circuit:
http://img194.imageshack.us/img194/986/labtcfe.jpg

I want to set those zener diodes to have a reverse biased voltage of 9.1V and forward biased of 1.2V but I don't know how to do it.

The second problem, is that I can't see, when I simulate, the Graph of those 2 V marks versus the time.

Can Someone help me out please? I've attached the .sch file.

Thx :)

Edit: Just noticed that R2 and R3 are switched. R2= 10k and R3=20.6k
 

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Here's the way to do it in MicroCAP SPICE. PSPICE may be similar. Is there anything in the Help files or application notes at the PSICE website?

http://www.spectrum-soft.com/news/fall2000/zenermodel.shtm

Alternately, you can do it as described in "Semiconductor Device Modelling with SPICE" by Antognetti and Massobrio. They build a macromodel with a DC voltage source in series with a standard diode in the forward direction (anode to cathode), and a DC voltage source in series with a diode and resistor in the reverse breakdown direction.
 
Thx for the help, I will check it out :)
I didn't find much support on PSpice website about this...
 

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