Bond Wire Impedance Matching Network for IC Stability
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Solution Overview
Problem
Physical implementation of impedance matching circuits in integrated circuits leads to non-ideal interactions such as mutual inductive coupling and increased reactive impedance, which complicates the stability and efficiency of functional circuits like broadband power amplifiers.
Innovation Solution
A configuration of bond wire connections and inductors is used to form a shunt inductor network over the die surface, with opposing current directions in bond wire pairs to cancel magnetic fields and minimize mutual inductance, and interleaved bond wire connections to reduce parasitic inductance and improve impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If impedance matching circuit is physically implemented in-package, then impedance matching effectiveness is improved, but mutual inductive coupling between components increases
Solution Approach 1:
The patent utilizes the inherent inductance of bond wires, which were previously considered parasitic harmful elements, and intentionally configures them to form inductors for impedance matching. By converting these harmful inductive effects into useful matching inductors, the patent eliminates mutual inductive coupling problems while achieving impedance matching functionality.
Solution Approach 2:
The patent extracts the impedance matching function from external discrete components and integrates it directly into the bond wire connections between the die and package leads. This extraction eliminates the need for separate matching components that would introduce additional mutual inductive coupling, thereby simplifying the structure and reducing harmful interactions.
2Reliability
If impedance matching circuit is physically implemented in-package, then impedance matching effectiveness is improved, but reactive impedance increases
Solution Approach 1:
The patent converts the parasitic inductance of bond wires into useful matching inductors. By carefully selecting bond wire parameters and configurations, the inherent reactive impedance that was previously harmful is transformed into a beneficial element for achieving the desired impedance match at the operating frequency.
Solution Approach 2:
The patent optimizes parameters such as bond wire diameter, length, material, and configuration to control the inductive reactance. By adjusting these parameters, the reactive impedance is tuned to provide the exact matching conditions needed, converting what was previously an uncontrolled harmful effect into a precisely controlled useful property.
3Device complexity
If bond wire connections are used for impedance matching, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent extracts the impedance matching function from complex external circuits and integrates it into the essential bond wire connections that are already required for electrical connectivity. This eliminates the need for additional matching components and reduces overall device complexity, while the precision requirements are managed through standardized bond wire specifications.
Solution Approach 2:
The bond wire connections serve dual functions: providing essential electrical connectivity between the die and package leads, and simultaneously functioning as impedance matching inductors. This multi-functionality eliminates the need for separate matching components, reducing device complexity while the manufacturing precision is controlled through universal bond wire specifications and configurations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the effectiveness of impedance matching by reducing mutual inductance and reactive impedance, improving the stability and operational bandwidth of integrated circuits by concentrating magnetic fields away from active areas and optimizing inductance levels.
Implementation Method 1
opposing current directions in bond wire pairs to cancel magnetic fields and minimize mutual inductance
Implementation Method 2
interleaved bond wire connections to reduce parasitic inductance and improve impedance matching
Data Source
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AI summary
A package is provided. The package comprises a die and an impedance matching network. The die has a first terminal and a second terminal. The impedance matching network is coupled to the second terminal and comprises a first inductor and a first capacitor. The first inductor comprises first bond wire connections coupled between the second terminal and a first bond pad on the die, and second bond wire connections coupled between the first bond pad and a second bond pad coupled to the first capacitor.