Looking for a structure of a common gate LNA

[M.B.]

Hi to all,

Please friends I need a structure of a common gate LNA. If it is possible i need a paper of CG LNA.

Please it is urgent.

Thanks and good work.

 

[Abhishekabs]

2009 lna paper

which transistor you are using?
what is the frequency? NF?

Be specific. If you need 1 GHz then 10 GHz LNA will not help you or CMOS LNA paper will not be helpful.

 

[M.B.]

cmos common gate amplifier

Thanks for your reply,

In fact, I need a CG LNA with CMOS transistor whatever the features of this structure because i need it for application of an optimization algorithm.

Good Work and have a nice day.

 

[Abhishekabs]

cg lna

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I think this will be good.

 

[N1UL]

common gate lna circuit

Common gate (or its equivalent common base ) amplifier are really not low noise. It is barely possible to get better then 5dB NF. The reason is that that for Fmin , Gamma Opt and S11* are too far apart. A simulation with the correct Data will show that Fmin << NF becausee of the matching needs. A better choice in my opinion is a cascode with the first Fet with source and gate degeneration or a derivative of this. A NF of about 1 dB is possible using a Chebychev polynomial derived wideband matching filter, if possible external to the chip. Recent IEEE papers of the MTT Journal give more insight.

While the above mentioned grounded gate application is a very nice treatment, it does not provide the lowest possible NF.

 

[Abhishekabs]

common gate amplifier

Hi.
Do you have any paper showing cascading of FET for broadband LNA?
Also I think, we should not say common gate LNA any more, it should be common gate amplifier insted. since its NF is high it does not fit in LNA definition.

 

[N1UL]

common gate low noise amplifier

I will try to find a cascode LNA circuit in the IEEE papers, there is no magic to it

 

[N1UL]

common gate

This is probably the best summary I could find on low noise CMOS input stages


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