Coupled Transmission-Line Interconnect for Wirebond Bandwidth Limits
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Solution Overview
Problem
High-speed connections using wirebonds and conductive traces in electronic components, such as electro-absorption modulators, face bandwidth limitations due to significant inductance, which restricts the system's bandwidth and performance.
Innovation Solution
A circuit configuration utilizing a network of coupled transmission lines, including three wirebonds connected to two conductive traces, with specific resistor and capacitor networks, and RF ground connections, to reduce inductive effects and enhance bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wirebonds and conductive traces are used for high-speed connections, then the connection is established between electronic components, but the significant inductance limits the bandwidth of the system
Solution Approach 1:
The interconnect is divided into multiple segments: multiple wirebonds (first, second, third wirebonds) connected in series, with intermediate connection points. This segmentation allows for distributed capacitance and impedance control, reducing the overall inductive effect while maintaining connection stability
Solution Approach 2:
Intermediate connection points and grounding structures are introduced between the wirebonds and conductive traces. These intermediaries provide RF ground references and capacitance that counteract the inductance of the wirebonds, enabling higher bandwidth while maintaining reliable connections
2Device complexity
If traditional interconnect configuration is used, then the structure is simple, but the bandwidth is limited
Solution Approach 1:
The interconnect design transitions from a planar two-dimensional layout to a three-dimensional configuration by stacking wirebonds vertically and using multiple conductive traces at different levels. This dimensional change allows for shorter current paths and reduced inductance while maintaining a compact footprint
Solution Approach 2:
The interconnect uses a composite structure combining different materials and geometries: wirebonds for vertical connections, conductive traces for horizontal connections, and strategic grounding structures. This composite approach optimizes the electrical characteristics by balancing inductance and capacitance across different material interfaces
Data Source
AI summary
An enhanced bandwidth interconnect circuit. In some embodiments the circuit includes a two-terminal device and a network for forming a connection to the two-terminal device. The network may include a first set of coupled transmission lines and a second set of coupled transmission lines. A second end of the first set of coupled transmission lines may be connected to a first end of the second set of coupled transmission lines, and a second end of the second set of coupled transmission lines may be connected to the two-terminal device.