Patent ID: 7907109

Claim:
A multi-reference voltage generator, comprising: a first bank of N m-bit registers, where N is an integer≧2, and m is integer≧2; a second bank of N m-bit registers; a first multiplexer having a first plurality of inputs connected to outputs of said first bank of registers and simultaneously having a second plurality of inputs connected to outputs of said second bank of registers, said first plurality of inputs being different than said second plurality of inputs; an m-bit digital-to-analog (DAC) having an m-bit parallel input connected to an output of said first multiplexer; an analog demultiplexer having an input connected to an analog output of said m-bit DAC; a first group of N voltage storage devices, wherein each voltage storage device in said first group is connected to a corresponding output of said analog demultiplexer; a second group of N voltage storage devices, wherein each voltage storage device in said second group is connected to a corresponding output of said analog demultiplexer; N further multiplexers, each of which has a first input connected to an output of a corresponding one of said voltage storage devices in said first group and a second input connected to an output of a corresponding one of said voltage storage devices in said second group; and N output buffers, each of which has an input connected to an output of a corresponding one of said N further multiplexers, and an output useful for driving a column driver; wherein said second bank of registers is written to while data in said first bank of registers is converted to analog voltages and stored in said first group of voltage storage devices.