Configurable I/O Module With Interleaved Pads For Signal Shielding
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Solution Overview
Problem
Existing input/output modules in integrated circuits face challenges in optimizing frequency performance due to signal interference and varying utilization needs across different package types, leading to suboptimal signal-to-noise ratios and utilization efficiency.
Innovation Solution
The implementation of a configurable input/output module with interleaved signal and voltage pads, along with unused pads coupled to buffers, allows for adaptable signal routing and shielding, optimizing frequency performance across wire bond and flip chip packages by adjusting pad utilization based on package type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If signal pads are densely packed to increase I/O utilization, then productivity is improved, but signal interference and cross-talk increase causing frequency performance degradation
Solution Approach 1:
Unused pads are introduced as intermediary elements between signal pads. These unused pads act as shields that block electromagnetic interference between adjacent signal pads, enabling dense packing of signal pads while maintaining signal integrity and frequency performance.
Solution Approach 2:
Pads that would otherwise be wasted space or unused resources are converted into beneficial shielding elements. The unused pads, which do not carry signals, are strategically positioned to reduce cross-talk and electromagnetic interference between active signal pads, turning a potential waste into a performance-enhancing feature.
2Device complexity
If fixed pad configuration is used to simplify design, then device complexity is reduced, but adaptability to different package types and frequency requirements is worsened
Solution Approach 1:
The pad configuration is made dynamic and configurable rather than fixed. The module can be programmed to assign different functions to pads based on the package type and frequency requirements, allowing the same physical layout to adapt to wire bond, flip chip, or other package types while optimizing for specific frequency ranges.
Solution Approach 2:
The I/O module is designed with universal functionality that can operate across different package types and frequency ranges. By making pads configurable and programmable, a single module design can serve multiple applications and package configurations, eliminating the need for separate fixed designs for each scenario.
3Reliability
If unused pads are left unutilized to maintain shielding function, then signal-to-noise ratio is improved, but I/O utilization efficiency deteriorates
Solution Approach 1:
The status of pads is made dynamic rather than static. Pads can be configured as unused/shielding elements when needed for signal integrity, or activated for I/O functions when utilization is prioritized. This dynamic reconfigurability allows the system to optimize between shielding and utilization based on specific application requirements.
Data Source
AI summary
A circuit can include a module having signal pads that are configurable to route signals between the circuit and at least one external device. The module can also have unused pads that are interleaved between the signal pads. A circuit can include a module having signal pads that are configurable to route varying signals between the circuit and at least one external device. The module can also have voltage pads that are configurable to route substantially constant voltages between at least one external device and the circuit. The signal pads can be interleaved between the voltage pads. A module with one or more of these features can achieve ideal performance in both wire bond and flip chip packages with the flexibility of setting a different input/output utilization percentage within the module.