A constant current source circuit, in which first and second FET's are formed, is disclosed. The first FET has a source-drain path connected between power voltage lines and a gate connected to one of the power voltage lines with the source in common. The second FET is connected at its drain to a current...http://www.google.fr/patents/US4937517?utm_source=gb-gplus-shareBrevet US4937517 - Constant current source circuit
