Stats

Locked Locked
Replies 6
Subscribers 63
Views 17095
Members are here 0

This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Interstage matching in Cadence Virtuoso

Hello,

I am trying to create a multistage amplifier operating around 200 GHz in Cadence Virtuoso. Could someone tell me how I can measure the impedances at intermediate nodes? I need this so that I can do conjugate matching between stages.

In the past, I have designed amplifiers using ADS. I used 'SP probe' between the stages to measure impedances. Is there something similar in Cadence Virtuoso?

I read something about 'sprobe' in cadence forums. I think I need to use that block. But unfortunately, I could not find it in my analogLib. Has it been added recently? Or am I missing something? (I'm using IC617)

Thanks.

ShawnLogan over 4 years ago

Dear sidt,

sidt said:
read something about 'sprobe' in cadence forums. I think I need to use that block. But unfortunately, I could not find it in my analogLib. Has it been added recently? Or am I missing something? (I'm using IC617)

If I understand your question, I believe this document will help understand its use in finding an interstage impedance for use in matching.

support.cadence.com/.../ArticleAttachmentPortal

Have you examined this? The note indicates the following:

"The sprobe was introduced in IC617 ISR15, ICADV12.3 ISR15 and Spectre 16.1 ISR8."

Hence, if your installation is earlier than ISR15, it will not be in the analogLib.

Shawn
Cancel
Vote Up +1 Vote Down

Cancel
sidt over 4 years ago in reply to ShawnLogan

Dear ShawnLogan,

Thank you for your answer. I am using ISR4. That's why I don't have the sprobe component.

- Sidt
Cancel
Vote Up 0 Vote Down

Cancel
Frank Wiedmann over 4 years ago in reply to sidt

You can build an sprobe yourself if you want, see edadocs.software.keysight.com/.../viewpage.action
Cancel
Vote Up +1 Vote Down

Cancel

Tawna over 4 years ago in reply to ShawnLogan

Hello sidt

Definitely upgrade your version of software. You're using a very old version of code. The sprobe is pretty easy to use. My article walks you through it step by step.

Article (20472560) Title:	Using the Spectre sprobe to measure impedance/stability in impedance matching networks and multi-stage designs
URL:	https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1O0V000006Ak2KUAS

We've also made quite a few improvements to the analogLib nport in IC618ISR9/ICADVM181ISR9 and later. You can now plot immittance (as well as impedance and admittance) on the Smith Chart.

Many great things in IC6.1.8/ICADVM18.1/ICADVM20.1!

Best regards,

Tawna

sidt over 4 years ago in reply to Tawna

Hi Tawna,
Thanks for the reply. I upgraded to IC618 and spectre 19. I now have access to sprobe.
Cancel
Vote Up 0 Vote Down

Cancel
sidt over 4 years ago in reply to Frank Wiedmann

Thanks. This is interesting.
Cancel
Vote Up 0 Vote Down

Cancel

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.