Crystal ladder filter

Reference: http://www.giangrandi.ch/electronics/crystalfilters/xtalfilters.shtml

Caratterizzazione Crystal 4.0000Mhz HC49S - RS-Components Cod.Prod 6936936

Calcolo Ladder filter con 4 poli

Filter schematic before and after matching network to ne612 impedance

Here the frequency response after in/out matching and standard component definition

Here the latest realized with xtal S parameters directly measured via network analyser:

ex. matching calculator site from:

http://www.changpuak.ch/electronics/calc_18.php