This circuit was found in a 1980s documentation, using a comparator from the time. The configuration can also be implemented with comparators or modern operational.
The circuit presented uses Linear Technology Operationals, having been found in a 1993 manual. The...
The circuit presented with low drift is from the Motrorola LinearDatabook of 1990. The circuit...
120 degree lagged signals can be obtained with the simple configuration shown in the figure....