the matching of the reactive part of the LNA impedance 50 Ω circle to be reached L’ LNA L5= 25.45 nH L’ L5 LNA input optimal impedance 1 L′ = 1 R R 2 2πf 50 2 2 − 2 2 R + X R + X For the BGA example, f = 915 MHz, R = 62 and X = 112. Then L' = 22.21 nH. AN5457 - Rev 3 page 42/75 AN5457 LNA matching
