I am designing a Low Noise Amplifier (LNA) for Ku-band(12GHz). For that I am using HJFET transistor. I am looking for the biasing circuit which can be useful to block RF signals of GHz range but allow DC signals.
plz use self bias, we used it for our LNA design . u will use a discrrete FET or implement it on a chip ?
Sir it is NE3511S02 HJFET manufactured by Renasas corporation ( Formerly Known as NEC corp.). For LNA design i need to bias the FET at 12GHz to Vds=2v and Id=10mA. In this biasing ciruit design i am facing problem.
As far as I understand, you can use bias tee to block ac and pass dc supply from source to transistor pin. The bias tee consists of a capacitor and an inductor. It can be used as Ell Match as well for impedance matching.
You can go through Microwave Circuit design book by Gonzalez which mentions Ell match.
By the way, are you using linear model or a non linear model for NE3511S02?
@Abhy i am using s2p file of NE3511S02 transistor. i think its a linear model. but i am not sure. i am just using the inbuilt library model of that transistor given in AWR software.
i think linear only , its useless to use a non linear model for LNA. its used for power amplifier design.
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