Differential comparator

Abstract

Abstract PURPOSE:To realize the highly accurate comparation by providing a circuit detecting an offset current of a differential circuit to correct said current. CONSTITUTION:When gate circuits 6, 14, 16 are conducted at an undesired period (at a level of the inverse of phi) and a gate circuit 4 is cut off, a reference potential VRF from a terminal 1 is fed to gates of MOS elements 2, 5 in common and an offset current caused by dispersion in components or the like is fed to circuits such as MOS elements 13, 15. When the gate circuit 4 is conductive at an effective period phi after that through the preparation above and the other gates are cut off, the same current as that at the undesired period the inverse of phi is kept flowing by a voltage charged up in the gate capacitance through the MOS elements 13, 15, and the current is subtracted from a signal extracted at output terminals 11, 12 to obtain output potentials VOT, the inverse of VOT without offset at output terminals 11, 12.

Inventors

• 👤 Mitsuo Soneda
• 👤 曽根田　光生

Bibliographic Details