RF Amplifier Die-Integrated Passive Connector for Parasitic Reduction
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Solution Overview
Problem
Conventional RF amplifier package designs require substantial space for impedance matching networks, leading to increased bond wire length and congestion, which results in parasitic effects that degrade performance and limit the ability to add filtering/blocking circuitry.
Innovation Solution
The integration of a passive electrical connector and a monolithically integrated capacitor within the RF transistor die allows for a more compact impedance matching network, relocating passive components to reduce congestion and parasitic effects, enabling the RF transistor die to be placed closer to the output lead while maintaining a complete output impedance matching network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive components are placed between the transistor die and package leads to form impedance matching networks, then impedance matching and filtering functions are achieved, but package area increases and bond wire length increases
Solution Approach 1:
The patent merges the passive electrical connector with the transistor die by forming the connector directly on the die substrate. This integration eliminates the need for separate discrete passive components and their associated bond wires, thereby reducing bond wire length while maintaining impedance matching functionality.
Solution Approach 2:
The patent transitions from a three-dimensional package layout with discrete components to a two-dimensional planar integration on the die surface. The passive electrical connector is formed as a conductive pattern on the die substrate, utilizing the die's surface area rather than requiring additional package volume, thus reducing bond wire length and parasitic effects.
2Reliability
If passive components are placed between the transistor die and package leads, then impedance matching networks are formed, but package area increases
Solution Approach 1:
The passive electrical connector is merged with the transistor die structure, utilizing the die's existing substrate area. This eliminates the need for additional package area that would be required for discrete passive components, while still providing the necessary impedance matching network functionality.
Solution Approach 2:
The die substrate serves multiple functions: it acts as both the mechanical support for the transistor device and as the electrical connector providing impedance matching network functionality. This multi-functionality reduces the need for separate dedicated areas for passive components, thereby reducing overall package area.
3Adaptability or versatility
If multiple bond wires are densely populated in the package for complex impedance matching networks, then complete filtering circuitry is achieved, but parasitic effects increase due to mutual coupling
Solution Approach 1:
The patent extracts the passive electrical connector functionality from the package level and relocates it to the die level. This extraction eliminates the need for multiple dense bond wires that cause mutual coupling, while still providing complete filtering circuitry through the integrated connector design.
Solution Approach 2:
The integrated passive electrical connector acts as an intermediary between the transistor die and the external circuit, providing impedance matching and filtering functions without requiring multiple separate bond wires. This intermediary structure reduces mutual coupling and parasitic effects by eliminating the dense bond wire population.
Data Source
AI summary
A packaged amplifier circuit includes an RF package with a die pad, and RF input and output leads extending away from the die pad opposite directions. An RF transistor die is mounted on the die pad such that a first outer edge side of the RF transistor die faces the first RF lead and a second outer edge side of the RF transistor die faces the second RF lead. A passive electrical connector is integrally formed in the RF transistor die. The passive electrical connector includes a first end connection point closer to the first outer edge side, and a second end connection point closer to the second outer edge side. A first discrete reactive device is mounted on the die pad between the first outer edge side and the first RF lead. The passive electrical connector electrically couples the first discrete reactive device to the second RF lead.