Patent ID: 6388599
Filing Date: 2002-05-14
Classification: H03M

Abstract:
A reference voltage generator circuit for delivering reference voltages to a plurality of systems including a first system and a second system, comprising:a first rough resistor bank including at least one resistor and a second rough resistor bank including at least two resistors, the firs and second rough resistor banks connected in parallel with each other between a high potential side and a low potential side reference voltage; a first fine resistor bank connected between the first and second rough resistor banks and connected in shunt with the at least one resistor in the first rough resistor bank and extending between the at least one resistor and a junction between at least two resistors in the second rough resistor bank; a second fine resistor bank connected in parallel with the first fine resistor bank; a first group of switches connected between nodes between adjacent resistors in the first fine resistor bank and the first system; and a second group of switches connected between nodes between adjacent resistors in the second fine resistor bank and the second system.