Electronics Forum / CAD / May 2005

What's the best way to change the phase angle of an ac sign wave? For
example, I'm trying to sim costas loop, and I need a 90 degrees phase
shift from the VCO output.

Does anyone use Boardmaker3?
If so is it any good?
TIA,
Rog.

I've been searching for a spice device model for SST201, VISHAY
SILICONIX, an N-Channel JFETs. Any such model or substitute exist?
thanks
bea

Hello,
I have simulated a circuit in Pspice and plotted out a Nyquist graph of my
output. Now, in order to verify a theory, I want to fit a formula on the
obtained graph.

Is there a freeware state diagram editor for Windows somewhere?
I need only very basic functionality. Essentially only drawing
circles, arrows and text labels, and being able to edit easily. No
need for code generation or other fancy stuff.

Is there an output device that will allow a single circuit parameter
to be written to a file?
I know that VPWL_FILE can be used to read an ASCII file of two
columns, time and voltage.

In any Quaduature modulator, you have a 'combiner' that combines the I
& Q.  Anyone have an idea of how to implement this in pspice 9.2.3?   I
dont see that part in my library... or am I missing it.

  When i test the actual circuit, the output has a transition "hump"
between the linear I/O part and the regulation part; it is about 900mV
in amplitude.
  The Spice does not show it; why?

I am a beginner in simulator.
Anyone can show me how to make sure the part and model file I use in my
LTspice and Pspice is for 0.18um cmos technology?
How to modify it? I just installed them on my computer and do not know

Good Morning,
I've a Gericom Webshox laptop, it is of 2001, I changed the battery
but it is still not working, the problem seems to be that the 15 volts
coming from power supply don't reach the battery, they seems stopped

I'm drawing a blank trying to remember how to use (IIRC) Hamilton's
Principle.
Isn't there some simple-minded way to take the energy at point A and
energy at point B, and calculate the force required to get from point

Wouldn't it be nice if SPICE allowed one to set the output
voltage/current of independent sources for computing the operating point
individually per source?
I realize LTSPICE has the "startup" option which can be a help, but

How I can find the current curve of a circuit?
I make circuits like simple RC with a Vsin source and put V and I
marker. The V marker gives the expected sin curve of V, but I marker
needs a pin and after that the curve is a flat (0) line and not a sin

Anyone know the link to obtain a BMP to Protel convertor. I think it is just
called Convertor.
cliff

Recent system hardware repair involved installing a new
motherboard.(ECS KM400-M2).
When everything was back up and running, I discovered that LTSpice
schematic entry no longer displayed a cross-hair cursor, when 'drawing