It's Official... PSpice Schematics v10.3!

[Kevin Aylward]

Chaos Master wrote:

Kevin Aylward is missing:



Since I don't like high resolutions, this is a problem.

(Otherwise, SS is a very good tool. Congratulations!)

Thanks. Have you got the latest I finally got around to adding some
16/8/4 Bit AD and 16/8/4 Bit DA converters. The models are pure
spice3 so they will also run in LTSpice. I use LTSpice myself as a
check on convergence so I try to make sure I have a set of analog
versions of digital models. If you do try to run the SS generated
net list in LTSpice, you have to press the pink "I" button to
generate a default include file. For reasons uknown LTSpice will
simply halt if it dosnt find an include file, when it should really
just issue a warning. LTSpice also does this with .options it dosnt
understand. I have one option that simply tells the engine to output
floats instead of doubles to reduce fie size. You only need doubles
for the calculations not the fnal output, usually.

Very good... I haven't tried the AD/DA converters, but they look good.

The example circuit is 16Bit-AD-DA.sss.

Even more so since they're SPICE3 compatible.

As an exercise, see if you can decipher the method of the AD. Hint:
instantaneous successive approximation. I might post a detailed circuit
of the method, if I can around to it.

The reason I decide to make them was investigating modulating the power
supply of RF transmitters. One wants to make the supply track the
envelope of the modulating signal to get the efficiency up. So one goes
A/Ds to D/A directly, which seems quite daft initially! The DA switches
little floating PS (say Transformer with diode cap) in a series/bypassed
fashion. The final output is the filtered quantised input used as a PS
to the TX, with low loss. The idea being that one is only limited by the
raw switching speed of the dac'ed PS. A PWM is going to have trouble at
say, 50Mhz modulation frequency.


Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.

 

[Keith Williams]

In article <cpnrnh$87f$3@grapevine.wam.umd.edu>,
no.thanks@im.sick.of.spam.com says...

However, virtually all Eunuchs based CAD packages (at least EE CAD
packages) are now available for Linux (x86 architecture). Of those
probably about 1/3rd are available in IA64 (Opteron) versions as well and
^^^^^^^^^^^^^^
I expect the number to be closer to 80% by the end of 2005.

Nitpick: IA64 == Itanic <> AMD64 == Opteron/Athlon64

So basically, there's no reason why you can't run any of the programs I
talk about on an AMD chip. In fact, I just got a brand new 16 GB dual
Opteron 250 to play with just for Nanosim, and trust me, its fast.

--
Keith