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Design >> RF Design >> lna NF
https://designers-guide.org/forum/YaBB.pl?num=1398044134

Message started by mixed_signal on Apr 20^th, 2014, 6:35pm

Title: lna NF
Post by mixed_signal on Apr 20^th, 2014, 6:35pm

I am designing a square law LNA. But when I replace ideal inductors with non-ideal (Q=14) ones then NF increases by 6dB!!! Can anyone suggest whats happening?

Title: Re: lna NF
Post by mixed_signal on Apr 20^th, 2014, 6:37pm

inductors for i/p matching network

Title: Re: lna NF
Post by aaron_do on Apr 20^th, 2014, 6:41pm

Is the frequency response still the same? Perhaps you didn't take into account the parasitic capacitance? Does it have anything to do with this being a square-law LNA (not sure what that is...)?

Aaron

Title: Re: lna NF
Post by mixed_signal on Apr 22^nd, 2014, 7:12am

I am sorry! Its a square law mixer. Using nonlinearity (MOS square law) for downconversion.

Title: Re: lna NF
Post by Mir on Apr 27^th, 2014, 12:45am

matching needs to be done properly