This dual-gate FET RF signal mixer circuit was found in a 1980s documentation. The circuit is intended for applications in superheterodyne receivers of the time.
This circuit is from 1964 documentation but can be easily implemented based on current components....
This circuit, which can generate voltages up to 25 V, was found in the December 1992 issue of...
Found in National Semiconductor documentation from the 90's, this circuit has an output current of...