Patent ID: 6100749
Filing Date: 2000-08-08
Classification: G05F

Abstract:
A current source circuit comprising:a series-circuit connected between a power supply node and ground comprising,a reference current source circuit,a first transistor having an NPN configuration and having its collector and base connected to each other anda second transistor having an emitter area N-fold a reference area, wherein N is greater than 1;a third transistor having an NPN configuration and connected to the power supply node at its collector, connected to the base of the first transistor connected to the base of the second transistor at its emitter, and having an emitter area M-fold the reference area, wherein M is greater than 1;an input current source circuit connected between the emitter of the third transistor and the ground to provide an input current; anda fourth transistor having an NPN configuration and having an emitter area equal to the reference area and having its collector-to-emitter circuit connected between a current output node and the ground and its base connected to the collector of the second transistor in order to provide an output current, whereinthe output current relative to the input current is proportional to a reciprocal of a product M.times.N of the emitter areas of the second and third transistors.