Patent ID: 6642793
Filing Date: 2003-11-04
Classification: H03F

Abstract:
A differential current mirror system capable of rejecting a common mode input current signal comprising:a pair of diode connected transistors comprising a first transistor and a second transistor coupled together in a common mode rejection configuration; a differential amplifier coupled to said pair of diode connected transistors, said differential amplifier comprising a third transistor and a fourth transistor coupled together, wherein the gate of said third transistor is coupled to the drain of said first transistor, and wherein the gate of said fourth transistor is coupled to the drain of said second transistor; and a fifth transistor coupled to said pair of diode connected transistors; wherein said differential current mirror system is capable of multiplying an alternating current input signal current by a ratio of a transconductance of said differential amplifier to a transconductance of said pair of diode connected transistors to obtain an alternating current output signal current in which said common mode input current signal is rejected.