Patent ID: 7195341

Claim:
A semiconductor substrate for a micro-fluid ejection device, the substrate comprising: a plurality of micro-fluid ejection actuators disposed in a columnar array adjacent a fluid supply slot in the semiconductor substrate; a plurality of power transistors disposed in a columnar array adjacent the ejection actuators and connected through a first metal conductor layer to the ejection actuators, the columnar array of power transistors occupying a power transistor active area of the substrate; a columnar array of logic circuits disposed adjacent the columnar array of power transistors and connected through a polysilicon conductor layer to the power transistors, the columnar array of logic circuits occupying a logic circuit area of the substrate; a power conductor for the ejection actuators routed in a second metal conductor layer disposed in overlapping relationship with at least a portion of the power transistor active area of the substrate; and a ground conductor for the ejection actuators routed in the second metal conductor layer disposed in overlapping relationship with at least a portion of the logic circuit area of the substrate.