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Design >> RF Design >> Mixer or not
https://designers-guide.org/forum/YaBB.pl?num=1245292876

Message started by microwaver118 on Jun 17^th, 2009, 7:41pm

Title: Mixer or not
Post by microwaver118 on Jun 17^th, 2009, 7:41pm

can anybody design a 3.5G Mixer with 15dBm iip3,16dB Conversion gain? can it be implemented in 0.13um CMOS 2.5V supply voltage?
Any tips will be welcome!

Title: Re: Mixer or not
Post by ACWWong on Jun 18^th, 2009, 9:22am

yes this seems like it can be done.... whether it can be done within the area and power budget is a different matter though.

Title: Re: Mixer or not
Post by microwaver118 on Jul 1^st, 2009, 1:50am

Thanks for your reply！Now I 'm facing difficulties when designing Mixer. it arrouds tradeoff between iip3 & Voltage Gain. One type 9dB VG with 15dBm iip3 OR another type 14dB VG with 10dBm iip3. it seems there exist a Figure Of Merit maybe VG+iip3 for a specified technology,so we can evaluate if this technology fit for the specification, maybe a limited we can achieve.is that right?

Title: Re: Mixer or not
Post by ACWWong on Jul 1^st, 2009, 2:28am

Its usual that for a given power consumption that in the design of most circuits there is a trade off in linearity and gain, when gain is up, linearity goes down and vice versa (having said that there is usually noise included into this balancing act). This is true for mixers, and your results seems typical for a given topology at a given power consumption. If you are not making spec, then more power or a better design topology should do the trick. I don't believe your spec is fundamentally limited by process technology node.