Patent ID: 6184723
Filing Date: 2001-02-06
Classification: H03G

Abstract:
A system for converting a control voltage to a PTAT current which comprises:(a) a plurality of differential transistor pairs, each differential transistor pair including a reference transistor and a non-reference transistor, each said transistor having a current path and a control electrode for controlling current in said current path, the control electrodes of said reference transistors each being coupled to a different reference voltage source;(b) a first output path coupled to a first end of the current path of each of said non-reference transistors;(c) a second output path coupled to a first end of the current path of each of said reference transistors;(d) a plurality of current sources, one current source for each differential pair, each said current source having a current path coupled to an opposing end of the current path of a different one of said transistor pairs and each current sources also having a control electrode; and(e) a PTAT current generator coupled to the control electrode of each of said current sources to control said current sources.