Semiconductor IC Pad Isolation for Noise and ESD
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Solution Overview
Problem
Conventional semiconductor IC devices face challenges in balancing noise interference reduction with electrostatic breakdown protection, as techniques that effectively lower noise interference often compromise electrostatic breakdown levels, and vice versa, due to impedance issues in connection points and wire configurations.
Innovation Solution
A semiconductor IC device design featuring multiple terminals connected through wire groups at a single point on lead frames, with pad groups forming inter-pad connections to manage impedance and reduce noise interference while maintaining electrostatic breakdown protection, utilizing intra-chip wiring to connect terminals after the wire bonding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If wires are divided into multiple isolated wires connected to separate pads, then noise interference is reduced, but electrostatic breakdown protection is compromised
Solution Approach 1:
The connection structure is segmented into multiple layers: wire-bonding layer (for noise reduction via single-point connection) and intra-chip wiring layer (for electrostatic protection via multiple parallel paths). This segmentation allows each layer to fulfill its specific function without compromising the other.
Solution Approach 2:
The solution transitions from a two-dimensional wire layout to a three-dimensional structure by adding vertical layering. The wire groups connect at a single point on the lead frame (first dimension), while intra-chip wiring provides additional parallel paths within the chip (second dimension), effectively adding spatial depth to the connection architecture.
2Power
If multiple terminals are provided to increase current capacity, then current supply capability is improved, but noise interference increases
Solution Approach 1:
Multiple terminals are segmented into functionally isolated groups, each connected to the lead frame through dedicated wire groups at separate single-point connections. This segmentation allows current capacity to be increased through multiple terminals while maintaining noise isolation through separate connection paths.
Solution Approach 2:
The lead frame serves as an intermediary structure that receives multiple wire group connections at spatially separated single points. This intermediary architecture allows multiple terminals to provide increased current capacity while the lead frame's distributed connection points prevent noise coupling between terminals.
3Object-generated harmful factors
If a single connection point is used to reduce noise interference, then impedance is lowered, but electrostatic breakdown protection is reduced
Solution Approach 1:
The connection architecture is segmented into two functional layers: the wire-bonding layer uses single-point connections for low impedance and noise reduction, while the intra-chip wiring layer provides multiple parallel paths for electrostatic breakdown protection. This segmentation resolves the contradiction by assigning different protection mechanisms to different layers.
Solution Approach 2:
The solution adds a third dimension (intra-chip wiring layer) to the traditional two-dimensional wire-lead frame connection. This vertical layering allows the first layer to optimize for noise reduction via single-point connections while the second layer provides redundant paths for electrostatic protection, effectively solving the contradiction through spatial dimensionality.
Data Source
AI summary
Disclosed is a semiconductor IC device capable of suppressing the interference of noise generated in one functional block with other functional blocks therein while protecting against electrostatic breakdown. A plurality of isolated pads are connected to a first terminal through respective wires, and further connected to a plurality of isolated pads each connected to a second terminal having the same function as that of the first terminal, so as to reduce noise interference based on the pad isolation and protect against electrostatic breakdown based on the inter-pad connection.