Power MOSFET Array Gate Pad Integration

The patent repositions the gate pad from a lateral arrangement (beside the array) to a vertical arrangement (above the array), utilizing the previously wasted space under the gate pad for additional MOSFET devices. This dimensional change allows the second power MOSFET array to be disposed under the gate pad, effectively converting unused vertical space into functional device area, thereby reducing overall array volume while maintaining electrical connection capabilities

The patent implements a nested structure where the second power MOSFET array is disposed under the gate pad, which itself is positioned above the first power MOSFET array. This nesting arrangement allows multiple functional layers to occupy the same horizontal footprint, with the gate pad serving as both a connection element and a structural layer that encloses additional devices, thereby maximizing space utilization

The patent divides the power MOSFET system into two separate arrays (first and second arrays), each with their own channels. By segmenting the current path into multiple parallel channels across different arrays, the system achieves high current capability without requiring each individual device to have an excessively wide channel, thus maintaining compact device dimensions while accumulating higher total current capacity

The patent merges two power MOSFET arrays into a single integrated structure that shares common source and drain regions. This combination allows the current capabilities of both arrays to be summed, achieving high power handling capability while maintaining compact volume through shared structural elements rather than requiring separate discrete devices

The patent employs self-aligned fabrication techniques where the gate pattern automatically defines the source and drain regions through sequential processing steps. This self-service approach ensures that critical dimensions and spacing are determined by the gate structure itself rather than requiring independent precise positioning, thereby achieving high channel density with relaxed manufacturing precision requirements

The patent performs preliminary patterning of the gate structure before forming the source and drain regions. This preliminary action establishes the precise spatial relationships and spacing between devices in advance, allowing subsequent processing steps to automatically inherit these precise dimensions without requiring additional high-precision alignment operations, thus enabling high integration with manageable manufacturing precision