Gate Driver Package Bond Wire Geometry for Signal Integrity
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Solution Overview
Problem
In semiconductor packages, asymmetric cross-coupling effects due to high voltages and rapid switching actions introduce parasitic capacitances and signal noise, affecting the integrity of differential signals carried by bond wires, leading to flawed gate driver operation.
Innovation Solution
The semiconductor package design includes a geometry that equalizes cross-coupling effects on bond wires by positioning them in vertical planes orthogonal to the side surfaces of the gate driver dies, with angles between 80 to 95 degrees, and using a controller die positioned between the gate driver dies to mitigate these effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bond wires are positioned in conventional geometries, then manufacturing is simpler, but asymmetric cross-coupling effects introduce parasitic capacitances and signal noise affecting differential signal integrity
Solution Approach 1:
The patent applies asymmetry by intentionally designing the bond wire geometry to create symmetric coupling effects. Specifically, the bond wires are positioned at angles of 80-95 degrees relative to the gate driver die sides, which creates a symmetric electromagnetic coupling environment that equalizes parasitic capacitances on both wires, thereby eliminating the asymmetric cross-coupling problem while maintaining manufacturing feasibility
Solution Approach 2:
The patent changes the geometric parameters of the bond wire arrangement, specifically the angle between the bond wire vertical plane and the gate driver die side surface (set to 80-95 degrees), and the spacing between bond wires. These parameter changes optimize the electromagnetic coupling characteristics to achieve symmetric coupling effects that preserve differential signal integrity
2Productivity
If high voltage switching is implemented for power supply control, then power conversion efficiency improves, but rapid switching actions generate parasitic capacitances and cross-coupling effects that degrade signal quality
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring the bond wire geometry (at 80-95 degree angles) to counteract the harmful cross-coupling effects that will be generated during high-voltage switching operations. This preemptive geometric design creates symmetric coupling conditions that cancel out parasitic capacitances before the switching transients occur, allowing efficient power conversion without signal degradation
Data Source
AI summary
In examples, a semiconductor package comprises a first driver die adapted to be coupled to a high-side switch of a power supply, the first driver die adapted to drive a gate of the high-side switch. The package also includes a second driver die adapted to be coupled to a low-side switch of the power supply, the second driver die adapted to drive a gate of the low-side switch. The package also includes a controller die positioned between the first and second driver dies and configured to control the first and second driver dies. The package also includes a pair of bond wires configured to provide a differential signal between the controller die and the first driver die, a vertical plane of a bond wire in the pair of bond wires and a vertical plane of a side surface of the first driver die having an angle therebetween ranging from 80 to 95 degrees.