From: Jim Thompson
Subject: Re: SPICE goes nuts again
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Date: Fri, 03 Jan 2003 17:22:42 GMT
NNTP-Posting-Date: Fri, 03 Jan 2003 12:22:42 EST
Organization: Cox Communications
On Fri, 03 Jan 2003 15:10:30 +0000,
Paul Burridge ,
In Newsgroup: sci.electronics.cad,
Entitled: "SPICE goes nuts again",
Wrote the following:
|Still trying to get to grips with the basics of simulation.
|I've just tried a simple experiment hooking up an ac voltage source to
|a voltmeter. The voltage source is set up to be 10Ghz at 1v
|peak-to-peak and the TA is set up as follows:-
|start time: 0
|stop time: 1s
|step ceiling 5m.
|when I run the simulation I get a 1v p-p sine wave alright, but over
|the course of 1 entire second on the graph, only about
|one-and-a-quarter cycles are reproduced, instead of the ten thousand
|million (yeah, I know it's not going to resolve that lot but you know
|what I mean) a reasonable person might expect. What's going on here?
|I've tried setting the source to 10Meg and 10K but basically just get
|proportionately less of one complete cycle displayed. It's as if
|there's a screw-up in the frequency scale somewhere. Any ideas?
You're actually seeing a near "solid" display with a beat note that's
brighter than the rest... aliasing ;-)
| 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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