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Simulators >> RF Simulators >> quesiton about SpectreRF simulation of mixer
https://designers-guide.org/forum/YaBB.pl?num=1194060121

Message started by manfred on Nov 2^nd, 2007, 8:22pm

Title: quesiton about SpectreRF simulation of mixer
Post by manfred on Nov 2^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

Title: Re: quesiton about SpectreRF simulation of mixer
Post by pancho_hideboo on 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.

Title: Re: quesiton about SpectreRF simulation of mixer
Post by Forum Administrator on 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

Title: Re: quesiton about SpectreRF simulation of mixer
Post by Ken Kundert on 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