matching small capacitor on chip
Does anyone have ideas how to matching a small cap, like 1.332 fF capacitor, the requied inductor is huge and can not put on the chip, is there some structure which I can use to reduce required inductor and still can match this small cap?
Thank you
Technically you can not match to a capacitor, as it is purely reactive. So, could you explain your problem further?
Rich
I mean to make it resonant at a fixed frequency, like 2GHz. Is there a way to do this?
Thank you
Why the capacitor is so small and the resonating inductor is so huge ? If you intend to put this inductance offchip, this is almost impossible due to bonding inductances and other parasitic effects of pads of the package.So, it's not practical..
Instead, you may try to put side by side by increasing the capacitor and decreasing the inductor..
Thanks, what you stated is right, just see if there have some other ways. I want a high Q too, that's why I am trying to do this.
Thank you
liletian
this 1fF cap is very small. Are you considering the effect of parasitic? they can be easily 100 times that value!
Mazz
Yes, I am not considering yet, I am thinking for ideal case right now. I am thinking if there is some kind of LC ladder which can lower inductor value to make matching possible for small capacitor.
Thanks