This configuration was found in an English magazine from 1965. It is valid for any junction FET. The input impedance is 5.5 M ohm higher than conventional stages.
The circuit presented was found in the Linear Applications Handbook of the National Semiconductoir of 1994....
We found this circuit in an Electronics World of 1967. The components are of the time and...
This frequency divider circuit that generates a ladder-shaped signal was found in the June 1968...