Leadframe Connectivity for Transistor Arrays
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Solution Overview
Problem
Conventional surface-mount technology for connecting transistors in integrated circuits is complex and prone to failure due to the need for multiple metal interconnect layers, which are difficult and expensive to manufacture, and result in high impedance paths and low yield.
Innovation Solution
A leadframe device with conductive strips provides connectivity between transistor arrays, reducing the complexity of metal interconnects by using a connectivity interface to connect source and drain nodes to common conductive strips, allowing for easier integration and lower impedance paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surface-mount technology with multiple metal interconnect layers is used to connect transistors in integrated circuits, then connectivity between transistors is achieved, but the manufacturing complexity increases and manufacturing cost increases
Solution Approach 1:
The patent extracts the interconnect function from the integrated circuit chip itself and relocates it to the leadframe substrate. The leadframe provides separate conductive paths that connect transistor arrays without requiring complex metal layers within the chip, thereby simplifying the chip structure while maintaining connectivity functionality.
Solution Approach 2:
The patent moves the interconnect structure from the planar dimension (metal layers on chip) to the three-dimensional dimension (leadframe extending below and around the chip). This allows conductive paths to be formed in multiple spatial dimensions, reducing the need for multiple stacked metal layers on the chip surface.
2Reliability
If conventional surface-mount technology with multiple metal interconnect layers is used to connect transistors in integrated circuits, then connectivity between transistors is achieved, but manufacturing cost increases
Solution Approach 1:
The patent extracts the interconnect function from the integrated circuit chip itself and relocates it to the leadframe substrate. The leadframe provides separate conductive paths that connect transistor arrays without requiring complex metal layers within the chip, thereby simplifying the chip structure while maintaining connectivity functionality.
Solution Approach 2:
The patent uses the leadframe, a relatively simple and inexpensive component, to perform the complex interconnect function. The leadframe acts as a disposable or sacrificial element that provides the necessary connectivity without requiring expensive manufacturing processes on the chip itself.
3Reliability
If conventional surface-mount technology with multiple metal interconnect layers is used to connect transistors in integrated circuits, then connectivity between transistors is achieved, but the yield decreases
Solution Approach 1:
The patent extracts the interconnect function from the integrated circuit chip itself and relocates it to the leadframe substrate. The leadframe provides separate conductive paths that connect transistor arrays without requiring complex metal layers within the chip, thereby simplifying the chip structure while maintaining connectivity functionality.
Solution Approach 2:
The patent segments the interconnect function from the chip fabrication process and places it in the leadframe assembly process. This separation allows the chip to be manufactured independently with simpler processes, while the leadframe provides the connectivity function, thereby improving overall manufacturing yield.
4Reliability
If conventional surface-mount technology is used for connecting transistors, then connectivity is provided, but the impedance path increases
Solution Approach 1:
The patent introduces the leadframe as an intermediary component between the transistor arrays and the external circuit. The leadframe's conductive paths provide a low-impedance connection route, mediating the electrical connection without the high impedance associated with thin metal layers on the chip surface.
Data Source
AI summary
According to example configurations herein, a leadframe includes a first conductive strip, a second conductive strip, and a third conductive strip disposed substantially adjacent and substantially parallel to each other. A semiconductor chip substrate includes a first array of switch circuits disposed adjacent and parallel to a second array of switch circuits. Source nodes in switch circuits of the first array are disposed substantially adjacent and substantially parallel to source nodes in switch circuits of the second array. When the semiconductor chip and the leadframe device are combined to form a circuit package, a connectivity interface between the semiconductor chip and conductive strips in the circuit package couples each of the source nodes in switch circuits of the first array and each of the multiple source nodes in switch circuits of the second array to a common conductive strip in the leadframe device.