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Impact of switch width on mixer output.

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milvapp

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Hello,

I am currently occupied with a passive single-balanced mixer as
shown in Fig.1 . https://obrazki.elektroda.pl/6136273400_1358247145.jpg
After running PAC simulation at Cadence,according
to this paper :

"Analysis and Optimization of Current-Driven Passive Mixers in Narrowband Direct-Conversion Receivers",

the output or baseband voltage should not be affected by the size of the switches.

However,by changing the width of the switch transistors,for example from
5um to 50um I get these results :

https://obrazki.elektroda.pl/5760033000_1358247143.jpeg

Can anyone tell me why they are different and how the width of the switch transistors
affect the output voltage?FYI,the output load is a RC 10MHz filter.
https://obrazki.elektroda.pl/1092281400_1358247144.jpg

Thank you in advance,
Vasilis
 

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