Patent ID: 6175224
Filing Date: 2001-01-16
Classification: G05F

Abstract:
A circuit regulating an output voltage by controlling a variable resistance through a measurement signal derived from the output voltage by a voltage sensor, characterized in that:a plurality of current paths identified by an index k, wherein said index is an integer, said current paths each having a current source identified by said index k and an emitter-collector path of a transistor identified by said index k serially coupled between a first reference terminal and a second reference terminal, said transistors having emitter areas A.sub.k and different current densities J.sub.k =I.sub.k /A.sub.k SO that some or all voltages V.sub.BEk across the base-emitter paths of said transistors k in each current path k are different, and wherein said transistors form pairs; anda first number of said emitter-collector paths being arranged in respect to said first and second reference terminals in a first direction; anda second number of said emitter-collector paths being arranged in respect to said first and second reference terminals in a second, opposite direction; and wherein only the voltage differences V.sub.BEk are combined by coupling base electrodes to emitter electrodes of neighboring pairs so that only the differences of V.sub.BEk, but not their absolute values are combined with a voltage present in said voltage sensor.