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Dear 246,
First choose suitable transistor, which has less Noise Figure and maximum gain, later design input and output matching circuit. Once design matching ckt, check the stability , if ckt is unstable , make it stable.
Some tips for your LNA..
-Your LNA will potentially have feedback circuit in order to achieve this bandwidth.
-Your LNA will probably be Cascode configuration due to very wide bandwidth.
-You should use SiGe or pHEMT device at those frequencies to provide Low Noise but it's not necessary recent Bipolar devices are also good-Look at www.avagotech.com
-You must consider and take the priority Noise Figure,Gain,IIP3,IRL,ORL respectively.
Some tips for your LNA..
-Your LNA will potentially have feedback circuit in order to achieve this bandwidth.
-Your LNA will probably be Cascode configuration due to very wide bandwidth.
-You should use SiGe or pHEMT device at those frequencies to provide Low Noise but it's not necessary recent Bipolar devices are also good-Look at www.avagotech.com
-You must consider and take the priority Noise Figure,Gain,IIP3,IRL,ORL respectively.
dear bigboss
could you recommend some books about the Cascode configuration and feedback circuit ? I want to understand the fundamental about it.
thank you very much!
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