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Simulating a mixer in spectre RF (Read 2254 times)

mixed_signal Senior Member Offline Posts: 183	Simulating a mixer in spectre RF Aug 20^th, 2013, 12:07pm Hi, In cadence tutorials they recommend to match mixer output using an ideal Balun to 50 ohm. For this you need to know the magnitude of output impedance (Zout of mixer). How do you find the mixer output impedance? Or just do a transient simulation for different values of termination resistor of 1:1 balun?
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aaron_do

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Re: Simulating a mixer in spectre RF
Reply #1 - Aug 20^th, 2013, 5:50pm

Hi,

are you designing a standalone mixer or is it part of an SoC? If it is not standalone, I don't think you need to match the output. You should terminate the mixer with its real loading conditions to get an accurate measure of its performance.

In order to find the output impedance, you can run a PSS+PAC analysis. The impedance is found like in the picture below.

Note that if you decide to terminate the mixer using the balun + port, then its even easier to check the output impedance as you can just run PSS + PSP analysis and plot Z or Y parameters.

regards,
Aaron

P.S. here is an earlier discussion on the same topic:
http://www.designers-guide.org/Forum/YaBB.pl?num=1240334878/18

MixerZout.tif

there is no energy in matter other than that received from the environment - Nikola Tesla

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