Disclosed is an electronic circuit comprising commonly connecting the gate end of a first transistor having a floating gate and the source end and the drain end of a second transistor having a floating gate to a first control input terminal, and commonly connecting the source end and the drain end of...http://www.google.de/patents/US5021693?utm_source=gb-gplus-sharePatent US5021693 - Control circuit for floating gate four-quadrant analog multiplier
