Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
When I simulate the noise performance of an amplifier using Cadence Spectre, I can get the values of output noise voltage (Vn,out) and noise figure (NF). But I use the formula
NF=square(Vn,out/A)*1/(4kTRs) (A is the voltage gain.)
the result of NF is different with the simulation...
Thanks for your reply.
The LNA is differential, and all current is 2mA, so each branch is 1mA. As I known, Cp is about 200fF, Cb is about 260fF, Lb is 1~2nH. Cp, Lb, Cb make real(Zin) small.
When the bondwire is not added, the NF is 1.4dB. Then NF is 2dB after the bondwire is added and some...
I'm in trouble with the input match of a LNA (Fig. 1). The impedance of Zin1 is very small because of the capacitors Cb and Cp. Cb is the parasitical capacitor of the bondwire and the package, and Cp is the parasitical capacitor of the pad and the ESD. Althought I can convert real(Zin) to 50...
Noise Figure of LNA when hign-temperature operation
Thanks.
But I have made NF=NFmin at normal temperature(27C), and I find NF is approximate to NFmin at high temperature(125C). The NF rises
about 0.6dB.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
