This configuration was found in an American publication from the 90s. Operators admit equivalents just like transistors. The circuit does not require a symmetrical source.
This traditional configuration is from a 1976 publication, showing that nothing has changed since...
This circuit was found in an 80's EDN. The circuit uses a current common CMOS, the 4093 powering...
This circuit was obtained in a1969 magazine. The magazine no longer exists, but the circuit can be...