From: Jim Thompson
Subject: Re: Transient Analysis in SPICE
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Date: Thu, 09 Jan 2003 18:12:01 GMT
NNTP-Posting-Date: Thu, 09 Jan 2003 13:12:01 EST
Organization: Cox Communications
On Thu, 09 Jan 2003 16:09:02 +0000,
Paul Burridge ,
In Newsgroup: sci.electronics.cad,
Entitled: "Transient Analysis in SPICE",
Wrote the following:
|I'm having to carry out several simulations on an RF amplifier that
|takes typically seems to take at least 0.2 seconds to 'settle down' to
|a steady output signal. So I'm looking to sample the output from say
|from 0.2s to 0.202s at a small enough time-step to be able to just
|about see individual cycles. So I set my start time for 0.2 seconds
|and enter the other time commands as above. Problem is, I'm staring at
|a blank screen for anything up to 15 minutes before the program
|reaches the bit I'm interested in and starts to plot it. This is very
|frustrating. Does anyone know of a way of 'fast-forwarding' to the
|desired stretch of waveform without racing past it too fast to see
|what's going on in detail within the actual desired section?
|When you have to do this over and over again it's enough to drive you
If you are only making mild circuit changes each time you start a new
simulation, the Save Bias Point/Load Bias Point feature in PSpice
*may* speed things up.
Another way that works very well, but is a bit cumbersome: "Enable
Display of Bias Voltages" after a simulation run and use those
voltages to set .IC for each of your capacitors.
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| Jim-T@analog_innovations.com Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
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