Patent ID: 7116597

Claim:
A device comprising: a plurality of cells each adapted to receive a first bias voltage, a second bias voltage, and a reference voltage, and to provide a cell reference; an averaging stage coupled to the cells to provide an average reference that is the average of the cell references, wherein the averaging stage comprises two transistors connected in a current mirror configuration with the cells to receive the cell references from the cells and to provide the average reference; and wherein the cells comprise a first and a second transistor each having three terminals, wherein: the first terminal of the first transistor provides the cell reference to the averaging stage, the second terminal of the first transistor receives the first bias voltage, and the third terminal of the first transistor is connected to the first terminal of the second transistor; and the second terminal of the second transistor receives the second bias voltage and the third terminal of the second transistor is connected to the reference voltage.