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fxxjssc
Joined: 06 Jan 2006
Posts: 80
Helped: 2
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 02 Nov 2007 15:41 900M LNA, Common source or common gate? |
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Dear all,
I want to design a LNA with spec. as following. Please give me some
advice about which type of LNA should I choose. Of course, other advice are
all welcome. Thanks ahead.
freq: 800M~950M
gain: 15db
NF: <4db
power: as less as possible
IIP3: 5dbm
process: CMOS TSMC0.18u
Main spec. above.
Could anyone give me some design example?
Best wishes
Jason
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mvs sarma
Joined: 23 Apr 2006
Posts: 381
Helped: 36
Location: Hyderabad, India.
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02 Nov 2007 17:02 Re: 900M LNA, Common source or common gate? |
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Try Common Gate as front end, followed by common source.
Sarma
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02 Nov 2007 17:02 Ads |
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khouly
Joined: 20 Oct 2003
Posts: 2479
Helped: 343
Location: EGYPT
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02 Nov 2007 19:28 900M LNA, Common source or common gate? |
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this results could be achived wih common source toplogy
khouly
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fxxjssc
Joined: 06 Jan 2006
Posts: 80
Helped: 2
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03 Nov 2007 1:52 900M LNA, Common source or common gate? |
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Dear Sarma and Khouly,
About IIP3 5dbm, is that not easy to achive
with common source structure?
Thanks
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khouly
Joined: 20 Oct 2003
Posts: 2479
Helped: 343
Location: EGYPT
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03 Nov 2007 3:00 900M LNA, Common source or common gate? |
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mmm , don't know , u need to check and try to do some manual calculations , but if u use some sort of sorce degeneration u mat get this vaule , but sure the gain will be less
khouly
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