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chunlee said:Thanks for everyone.
i want to calculate my LNA noise figure using hspice. the formula that i used is as below:
NF(dB) = 10 log( 1 + (inoise*inoise)/(4kT*Rs) )
Rs is source impedance, inoise is input reference noise current which can obtain using .noise analysis using hsipce (inoise not include noise generated by Rs).
is it the NF formula above correct?
Added after 3 minutes:
sorry... some corrections... inoise is input reference noise voltage
(which can display in output listing file using .print ac inoise command )
F = 1 + Fe and Fe is equal to
Fe = vnoise^2/(4*k*T0*Rs*B)
chunlee said:F = 1 + Fe and Fe is equal to
Fe = vnoise^2/(4*k*T0*Rs*B)
thanks to estradasphere.
i found that i don't include bandwidth in the NF formula but you had include the bandwidth in the formula. which definition is correct?