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Design >> RF Design >> Dual Band LNA design
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Message started by rittu on Apr 15^th, 2004, 5:24am

Title: Dual Band LNA design
Post by rittu on Apr 15^th, 2004, 5:24am

Hello,
I am working on a dual-band LNA. I have designed it for 802.11a(5.25GHz) and 802.11b(2.45GHz). This is a concurrent LNA which matches to 50 ohms at both 2.45GHz and 5.25GHz. The problem I am facing is that when I consider the pin parasitics of the package (TQFP) The matching at the input of the LNA is seriously disturbed. In single band LNA the pin parasitics which include a capacitor(200-500fF) is tuned out at the single frequency of interest using an external inductor. Since my application requres tuning at both the frequencies I cannot use this technique. Can anyone help me out in this matter. How can I get a 50ohm match at both the frequencies including the pin parasitics.
Thanks in advance
Rittu