This 80's circuit can be implemented with modern equivalent FETs with lower on resistance. The attenuation is 80 dB at 100MHz.
This configuration can be found at several points in this section and on this website. With the...
This circuit was obtained in a QST magazine from the 90s. The circuit makes use of components that are...
Found in a 90’s Popular Electronics, this circuit applies to almost any operational amplifier. With...