Patent ID: 7241419

Claim:
A circuit for a device adapted to receive a conductive solution including charged biological materials comprising: an array of unit cells arranged in rows and columns, the array of unit cells disposed on a chip for receiving a conductive solution including charged biological materials, wherein each unit cell comprises: a first column select transistor, the first column select transistor being adapted for control by a column selector, a first row select transistor, the first row select transistor being adapted for control by a row selector, the first select transistors being connected in series to each other and between a node and a first supply, an output connected to the node, a second column select transistor, the second column select transistor being adapted for control by a column selector, a second row select transistor, the second row select transistor being adapted for control by a row selector, the second select transistors being connected in series to each other and between the node and a second supply, wherein the channel length of the column select transistors is larger than the channel length of the row select transistors, and a return electrode.