[SOLVED] cadence virtuoso s parameters

Hi,

when doing s parameter analysis in cadence, S11 generated during simulation is w.r.to voltage or w.r.to Power?

Regards,
Praveen Gunturi.

S-parameters are always power waves.

BigBoss said:

S-parameters are always power waves.

Click to expand...

Correctly, it should be sqrt(Power Wave).

Also, see https://www.designers-guide.org/Forum/YaBB.pl?num=1266403928

yes. I know that but when s parameter simulations are done in cadence, we see 20 dB scale in the plotting option.

What I meant is if cadence is using voltage option for reflection coefficient, then it should use 20 dB scale otherwise it should use 10dB scale. So, does cadence taking voltage for calculating reflection coefficient magnitude?.

Please correct me if I'm wrong.

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yes. I know that but when s parameter simulations are done in cadence, we see 20 dB scale in the plotting option.

What I meant is if cadence is using voltage option for reflection coefficient, then it should use 20 dB scale otherwise it should use 10dB scale. So, does cadence taking voltage for calculating reflection coefficient magnitude?.

Please correct me if I'm wrong.

praveen450 said:

I know that but when s parameter simulations are done in cadence, we see 20 dB scale in the plotting option.

Click to expand...

In any simulator, S-parameters are sqrt(Power Wave), that is, Voltage Wave not Power Wave.

praveen450 said:

What I meant is if cadence is using voltage option for reflection coefficient, then it should use 20 dB scale otherwise it should use 10dB scale.

Click to expand...

Use db20(), since S-parameters are sqrt(Power Wave), that is, Voltage Wave not Power Wave.

See the followings.
https://www.edaboard.com/threads/169558/
https://www.edaboard.com/threads/170753/
https://www.designers-guide.org/Forum/YaBB.pl?num=1266168115/1#1