Parallel Switching Element Gate Layout for Equal Electrical Length
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Solution Overview
Problem
Semiconductor devices with multiple transistors connected in parallel exhibit variations in electrical properties such as inductance and resistance due to differences in wire lengths connecting control and drive electrodes, affecting their operation, particularly in inverter and DC-DC converter circuits, requiring large design margins.
Innovation Solution
A semiconductor device configuration with a die pad, switching elements, a control lead, and a control connection member, where the control connection member connects control electrodes of switching elements to a control lead with equal-length electrode connectors, reducing variations in electrical properties by ensuring consistent electrical length and minimizing mutual inductance through parallel current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wires of different lengths are used to connect control electrodes to leads, then the structure is simpler to manufacture, but variations in electrical properties such as inductance and resistance increase among transistors
Solution Approach 1:
The patent applies parameter changes by standardizing the length parameter of all control wires to be equal. This ensures that electrical properties such as inductance and resistance remain consistent across all transistors, eliminating variations caused by different wire lengths while maintaining manufacturing feasibility through a standardized connection structure.
2Manufacturing precision
If equal-length electrode connectors are used to connect control electrodes, then variations in electrical properties are reduced, but the device complexity increases
Solution Approach 1:
The patent merges multiple control electrodes onto a single common pad structure, from which equal-length electrode connectors extend to each transistor. This combining approach simplifies the overall connection architecture while maintaining equal electrical path lengths, reducing device complexity compared to having separate connection structures for each transistor.
3Area of stationary object
If control electrodes are connected to the same pad, then the structure is more compact, but variations in inductance and resistance values increase due to different wire lengths
Solution Approach 1:
The patent maintains the compact layout of connecting control electrodes to the same common pad while applying parameter changes by ensuring all electrode connectors have equal lengths. This standardization of the length parameter compensates for the potential electrical property variations that would otherwise arise from the compact shared pad structure, achieving both compactness and electrical consistency.
Data Source
AI summary
A semiconductor device includes two first switching elements mounted on a first die pad. Each of the two first switching elements includes a first control electrode connected to a first control lead by a first control connection member. The first control connection member includes a lead connector connected to the first control lead and electrode connectors connected between the lead connector and the first control electrodes of the first switching elements. The electrode connectors are equal in length. Thus, the connection members between the first control lead and the first control electrodes of the first switching elements are equal in length.