RF Design - All Comments

Nice article. Clear ...

Andy1959 — Sat, 30 Jan 2010 11:15:07 GMT

Nice article. Clear concise, and to the point. A nonlinear example like a mixer or a sigma delta would also be very useful.

The application note ...

Tawna — Wed, 13 Jan 2010 09:51:08 GMT

The application note "Using the nport in Spectre and SpectreRF Simulations" has been updated for MMSIM 7.2 and IC 6.1.4. The application note illustrates how to use the nport component from the analogLib library in Spectre and SpectreRF simulations within the Virtuoso Analog Design Environment. You may access the appNote in the Design Topics section at www.support.cadence.com .

best regards,

Tawna

An application note ...

MarkSummers — Thu, 07 Jan 2010 06:39:19 GMT

An application note would a couple of basic examples would work well. A methodology that works for both switched cap and continuous time implementations would be very nice. Longer term a measurement test box may be the way to go. However having a good document as a reference to refer too is always a good thing. Hope this helps.

Mark, The r ...

Anonymous — Sun, 03 Jan 2010 05:59:18 GMT

Mark,

The request is has come up often recently. As the tools have advanced, it is difficult for designers to know when to use which technology for what problem. It is definitely something that we need to do more systematically. One question for you as a user, how would you like to see the guidelines provided: Published as application notes? As measurement testboxes? ...?

Can somebody give an ...

Anonymous — Thu, 31 Dec 2009 09:33:53 GMT

Can somebody give an overview of all syntax to customize viva?

Good post. Anything ...

MarkSummers — Sat, 19 Dec 2009 16:39:21 GMT

Good post. Anything that reduces sim time and allows things like corners and montecarlo is good. In paticular the non-linear topic will be interesting. Switched cap circuits take a while for transient simulations and improving these will help greatly. In particular sigma-delta designs would greatly benefit. I have seen some documents on how to check noise for sigma-delta ADC's with spectre-RF, however I have never been able to get accurate results. A comprehensive guide on noise and distortion simulations with sprectre-RF for these type of circuits would be of great benefit.

Hi RizwanAhmed, h ...

Anonymous — Mon, 16 Nov 2009 19:01:07 GMT

Hi RizwanAhmed,

http://support.cadence.com solution 11571722 may be what you are looking for:

Guidelines for simulating frequency dividers in spectreRF

best regards,

Tawna

Is there a step by s ...

RizwanAhmed — Thu, 05 Nov 2009 21:53:06 GMT

Is there a step by step tutorial about "how to simulate divde-by-2" ?

I have not run this ...

BunnyMan — Sun, 18 Oct 2009 17:52:57 GMT

I have not run this module, but from what I've read here, I agree with Kevin’s comments in that as much documentation as possible should remain on the schematic. This would make it easier to review and update both the design & test attributes together. I would also like to see the program read in the variables. Then, allow active test changes and document the final test parameters if any. Indeed, this is a great start (keep going!). I look forward to seeing any future updates.

A very good example ...

Frank Wiedmann — Thu, 08 Oct 2009 08:42:09 GMT

A very good example that shows how useful pstb analysis is for simulating the stability of DC/DC converters can be found at www.cadence.com/.../CD12_WerthT_iasrwth.pdf .

Hi Shail, I'm not ...

Anonymous — Mon, 21 Sep 2009 17:56:34 GMT

Hi Shail, I'm not sure what you mean by "wasn't able to find a download link to spectreRF". If you want to download the software, you go to downloads.cadence.com and download MMSIM 7.1 (for example). SpectreRF is included in the MMSIM stream.

best regards,

Tawna

hi all well i wasnt ...

Anonymous — Sat, 19 Sep 2009 02:13:57 GMT

hi all well i wasnt able to find a download link fo spectreRF can u plz send me the link or post it here...

thanks

shail

Hi mmwave, rfTlin ...

Tawna — Sat, 29 Aug 2009 00:29:40 GMT

Hi mmwave,

rfTlineLib is located in the IC5141 cds hierarchy at /path_to_cds/tools/dfII/samples/artist/rfTlineLib

Note that rfTlineLib is not yet supported in IC6.1.3, but will be in the future.

best regards,

Tawna

Where is rfTlineLib ...

mmwave — Fri, 28 Aug 2009 00:58:41 GMT

Where is rfTlineLib located? Just couldn't find it.

You could try to do ...

Frank Wiedmann — Mon, 24 Aug 2009 09:28:45 GMT

You could try to do a frequency sweep relative to the first harmonic. However, this does not seem to be possible for PSTB, at least not via ADE. You can still try a PAC simulation instead. Because your break point has a low output impedance and high input impedance, you can put a PAC source in series and calculate the loop gain as the (negative) ratio of the PAC amplitudes on both sides.