CMOS differential amplifier circuit utilizing a CMOS current sinking transistor which tracks CMOS current sourcing transistors

摘要

A control circuit comprising several CMOS transistors operating in cooperation with certain dimension relationships among the CMOS transistors to provide a first reference voltage to the gates of two current sourcing transistors and to provide a second reference voltage to the gate of a current sinking transistor, the two reference voltages being related, resulting in a desired tracking between the current sinking transistor and the two current sourcing transistors. The current sink transistor operates to current limit at a value which is approximately twice the current limiting value of either of the two current source transistors such that a substantial improvement in circuit performance is obtained.