Flat No-Leads Package RF Lead Pin Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional flat no-leads packages are limited to RF frequencies up to 2-25 GHz due to their construction, making them less expensive but less capable for high-frequency applications compared to advanced packages like LCP or ceramic packages, which are more expensive and complex.
Innovation Solution
A customized leadframe design with a multi-level RF lead pin structure that expands in both horizontal and vertical directions within the package, optimizing RF compensation internally to reduce parasitic inductances and capacitances, allowing for higher RF performance without external compensation, maintaining a standard footprint for compatibility with existing assembly techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional flat no-leads package construction is used, then cost is reduced and manufacturing simplicity is improved, but RF performance is limited to frequencies up to 2-25 GHz
Solution Approach 1:
The leadframe is designed with non-uniform cross-sections where different portions have different geometries optimized for their specific functions: the first portion has a cross-section optimized for external contacting, the second portion has a different cross-section optimized for wire bonding, and the third portion has yet another cross-section for internal RF compensation. This local differentiation allows the single leadframe structure to achieve high RF performance while maintaining conventional manufacturing processes.
2Reliability
If advanced packages like LCP or ceramic packages are used, then RF performance is improved for high frequencies, but cost increases and manufacturing complexity increases
Solution Approach 1:
The leadframe performs multiple functions that would otherwise require separate components: it provides mechanical support, electrical connection, RF compensation, and thermal management. The integrated design with its multi-portion structure enables the leadframe to compensate for parasitic effects internally without requiring external compensation circuits or additional components, thereby maintaining simplicity while achieving high RF performance.
3Reliability
If advanced packages like LCP or ceramic packages are used, then RF performance is improved for high frequencies, but manufacturing cost increases
Solution Approach 1:
The leadframe's geometric parameters are optimized across different portions to achieve high RF performance. By varying the cross-sectional dimensions and shapes of the different portions, the design compensates for parasitic inductances and capacitances without changing the fundamental conventional package structure or materials, thereby avoiding the cost increase associated with advanced package materials like LCP or ceramic.
4Ease of manufacture
If a single uniform leadframe structure is used, then manufacturing is simplified, but RF compensation is insufficient for frequencies above 25 GHz
Solution Approach 1:
The leadframe is segmented into multiple portions (first, second, and third portions) with distinct cross-sectional geometries. Each portion is optimized for its specific function: external contacting, wire bonding, and RF compensation. This segmentation allows the leadframe to provide adequate RF compensation for frequencies above 25 GHz while still being manufacturable as a single integrated component using conventional processes.
Data Source
AI summary
A flat no-leads package, the flat no-leads package includes a leadframe for electrically connecting an integrated circuit (IC) chip which in a mounted configuration is arranged in a center portion of the flat no-leads package. The leadframe has at least one RF lead pin; and an isolating encapsulation which is at least partially encapsulating the leadframe such that contact surfaces of the leadframe are electrically contactable at least from a bottom side of the flat no-leads package; wherein at least one of the RF lead pin has a first and second contact surfaces. A cross-section of the RF lead pin increases from the first contact surface to the second contact surface both in a horizontal direction and in a direction vertical thereto. Further, a printed circuit board having a flat no-leads package and a measurement device having a flat no-leads package are provided.