gholamreza
New Member
Offline
Posts: 1
|
Hi all,
I am a new member in designers-guide. About MIM cap, I am using it as a coupling capacitor, but when I extract the layout, in extracted file there is a big parasitic capacitance for top plate which degrade the NF of my LNA and also change its frequency. My coupling capacitors are 2pF and the value of extracted top plate parasitic capacitor is 150fF. From the topics here and also the pdf of desingkit it seems that the reasonable value for parasitic capacitance of the MIM caps are 1-2 % of the main cap. So, I would like to know that the results of the extraction are reasonable or not. My process MIM caps have been constructed in M8 (both of the plates).
Thank you in advance,
|