24GHz LNA design
So, here are my thoughts on an LNA design for 24 GHz, inpired by Ron Schiltmans DU3T design, I thought I would try something similar. The basic concept is a waveguide input, 2 stage desgin for 24GHz, with a CE3520K3 FET on the input, and a MMIC amplifier as the second stage. For the second stage I plan to use an HMC341 I will include my calculations and assumptions for the design, if you can spot an error in my thoughts, I would be of course, delighted to hear from you! The circuitry on the left is a simple 3.3V regulator, feeding a ICL7660 negative voltage generator. The 3.3V is used to feed power to the MMIC amplifier and the input FET. A simple P type FET prevents power being supplied to the front end FET before the negative voltage is present. The CE3520K3 was selected as it is pretty much the only real option easily obtainable from Mouser. I'd like to give you a better answer based on cost and performance, selection of matching parameters etc, but bas...