Patent ID: 6791374
Filing Date: 2004-09-14
Classification: G11C

Abstract:
A hold cell, comprising:hold circuitry providing a pair of output voltages, the hold circuitry configured to receive a positive input voltage and a negative input voltage prior to entering a hold mode of operation, the hold circuitry further configured to provide the pair of output voltages in an absence of the positive input voltage and the negative input voltage following entry of the hold mode of operation; control circuitry in electrical communication with the hold circuitry, the control circuitry configured to receive the pair of output voltages from the hold circuitry, the control circuitry being further configured to generate a feedback signal during the hold mode of operation, the feedback signal being based on comparison of a common mode voltage and a reference voltage, wherein the common mode voltage is derived from the pair of output voltages; and variable current source circuitry defined to be in electrical communication with the control circuitry and the hold circuitry, the variable current source circuitry configured to receive the feedback signal from the control circuitry, the variable current source circuitry being further configured to provide a current to the hold circuitry based on the received feedback signal during the hold mode of operation, the current being defined to minimize a difference between the common mode voltage and the reference voltage.