power amplifer with very low Input power

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hkpradeepkumar

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Hi,i am designing a PA,Freq range 30-512MHz, supply voltage 7.5v,1.2A.Input power -5dbm(0.0316 micro watt), output power needed 5W. I am using coaxial transformers and baluns for matching. Because of very low input power i can not trigger my transistor.if i give 10dbm input everything works fine. So help me in this.How can i trigger my transistor by doing some preamplifing feedbacks adding some elements . i can not change my transistor and i have to use -5dbm input power.
 

You could change the class of operation of your 1st gain stage. Try Class A/B maybe? If not Class A will work.

Or add another amplifier in front of that gain stage and have it run in either Class A or A/B.
 
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Trigger the transistor ?????
I have never heard such terminology in my life ...
You have a Power Gain and you will get Output Power=Input Power x Power Gain.. that's it..
Is it a digital circuit ???
 

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