Stacked Chip Wire Bond Layout for Differential Pair Routing
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Solution Overview
Problem
Existing semiconductor packages face challenges in efficiently transmitting differential mode signals between stacked semiconductor chips due to overlapping and crossing bonding wires, leading to potential signal errors and reduced reliability.
Innovation Solution
Implementing a signal path control circuit that changes the signal path of differential pair signals to option pads using control signals, allowing for efficient wire bonding and maintaining the differential mode transmission method without additional trace design modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If differential pair signal pads are directly connected to bond fingers on the package substrate, then signal transmission is established, but wire crossings occur causing signal errors and noise
Solution Approach 1:
The signal transmission path is segmented into multiple routes by introducing option signal pads as intermediate connection points. Instead of direct connection between differential pair signal pads and bond fingers, the signal can be routed through option pads, allowing separation of true and complementary signal paths to prevent wire crossings.
Solution Approach 2:
Option signal pads serve as intermediary connection points between the differential pair signal pads and the bond fingers on the package substrate. These intermediate pads allow reconfiguration of signal paths, enabling true and complementary signals to be transmitted through separate, non-crossing routes.
2Device complexity
If fixed signal paths are used for differential pair transmission, then wiring is simplified, but signal path flexibility is reduced when avoiding wire crossings is needed
Solution Approach 1:
The signal path configuration is made dynamic and reconfigurable through the introduction of option signal pads and associated control circuits. The signal paths can be dynamically adjusted during operation to select different routing configurations, allowing the system to adapt to different packaging arrangements and avoid wire crossings as needed.
Solution Approach 2:
The option signal pads serve multiple functions: they can act as alternative connection points for differential pair signals, provide additional routing options, and enable reconfiguration of signal paths. This multi-functionality allows the same pad structure to support both simple direct connections and complex reconfigured paths to avoid wire crossings.
3Object-affected harmful factors
If option signal pads are added to provide alternative signal paths, then wire crossing is prevented, but device complexity increases
Solution Approach 1:
The option signal pads are merged with the existing pad structure of the semiconductor chip, integrating the alternative routing capability into the original design framework. The control circuits for switching between signal paths are also integrated into the chip architecture, combining multiple functions into unified structures to minimize overall complexity.
Data Source
AI summary
A semiconductor package includes a package substrate, first and second semiconductor chips stacked on the package substrate and wire-bonded to the package substrate. The first semiconductor chip includes first differential pair signal pads, a first option signal pad, and a first signal path control circuit. The second semiconductor chip includes second differential pair signal pads, a second option signal pad, and a second signal path control circuit. The first signal path control circuit changes a signal path of one of the differential pair signals of the first semiconductor chip by a first control signal. The second signal path control circuit changes a signal path of one of the differential pair signals of the second semiconductor chip by a second control signal.