Designer’s Guide Community

manfred

Junior Member

Offline

Posts: 15

quesiton about SpectreRF simulation of mixer
Nov 02^nd, 2007, 8:22pm

Hi, everyone!

I'm designing one mixer which is low-IF architecture, (RF is 1575M, Lo is 1571M, so IF is 4M)
when simmulation with PSS or PSP, the Bit Frequency is 1M, if I want to observe 1.5G frequency, the sideband will be set 1500!!
It's too big than the maximum sideband,250. �
what's more, the sideband is big, the simulation is very slow!

who can tell me how to deal with this problem? thanks a lot

Back to top

IP Logged

pancho_hideboo

Senior Fellow

Offline

Posts: 1424
Real Homeless

Re: quesiton about SpectreRF simulation of mixer
Reply #1 - Nov 2^nd, 2007, 11:53pm

Just use "select from range" instead of "Number of harmonics" and "maxsideband".
Or use HB-QPSS/QPSP.

You can easily find these solutions if you read manual surely.

I don't think this forum is a place where you ask questions about specific tool's usage.
Read manual or contact with technical support of EDA vendor.

Back to top

« Last Edit: Nov 3^rd, 2007, 4:38am by pancho_hideboo »

Kita━━━━━━(ﾟ∀ﾟ)━━━━━━ !!!!!
http://www7.plala.or.jp/ungeromeppa/flash/kita.html
http://www.youtube.com/watch?v=mjIxGh55bMM&feature=related

IP Logged

Forum Administrator YaBB Administrator Offline Posts: 145	Re: quesiton about SpectreRF simulation of mixer Reply #2 - Nov 3^rd, 2007, 5:36pm It is perfectly acceptable to ask questions about specific tools on this forum. However, you should not ask simulation questions in a design board. Use the appropriate simulation board. In this case, that would be RF Simulation. -Ken
Back to top	IP Logged

Ken Kundert

Global Moderator

Offline

Posts: 2384
Silicon Valley

Re: quesiton about SpectreRF simulation of mixer
Reply #3 - Nov 3^rd, 2007, 5:59pm

You can get a lot of useful information by just applying the LO alone (with PSS) and using a small signal analysis, such as PAC or PNoise. This would give the transfer function through the mixer or the noise performance of the mixer. If you want distortion information, you should use QPSS.

Either harmonic balance or shooting methods can be used.

-Ken

Back to top

IP Logged