Multi-Chip RF Package for Cascading With Low Phase Variation
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Solution Overview
Problem
Single RF transceiver chips have limited virtual array elements, necessitating cascading multiple chips on printed circuit boards, which increases size and cost while compromising performance.
Innovation Solution
A cascaded RF system is assembled in a single multi-chip package, where a primary RF chip and at least one secondary RF chip are synchronized and interconnected, with shared local oscillator and clock signals, reducing interconnection length and minimizing phase variations due to temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple RF transceiver chips are cascaded on printed circuit boards, then the number of virtual array elements is increased, but the device size and cost increase
Solution Approach 1:
Multiple RF transceiver chips are integrated into a single multi-chip package, merging what would traditionally be separate PCB-mounted components into one compact unit. This combining approach maintains the increased number of virtual array elements while significantly reducing the overall device footprint compared to PCB cascading
Solution Approach 2:
Multiple RF chips are nested within a single multi-chip package structure, with chips arranged in a compact configuration inside the package. This nesting enables multiple functional elements to coexist in a small volume, achieving high element count without proportional increase in device size
2Quantity of substance
If multiple RF transceiver chips are cascaded on printed circuit boards, then the number of virtual array elements is increased, but the cost increases
Solution Approach 1:
Multiple RF chips are packaged together in a single multi-chip package, merging multiple manufacturing steps and components into one integrated unit. This reduces the total number of separate components that need to be sourced, managed, and assembled, thereby reducing overall manufacturing cost despite increased functionality
3Adaptability or versatility
If RF chips are interconnected on printed circuit boards, then cascading is achieved, but interconnection length increases causing RF losses and phase variations
Solution Approach 1:
Multiple RF chips are nested within a single multi-chip package with very short interchip interconnections. The nested configuration enables direct coupling between chips through minimal-length bonds or traces, dramatically reducing RF signal loss compared to long PCB traces while maintaining full cascading capability
Solution Approach 2:
The patent transitions from two-dimensional PCB layout to three-dimensional multi-chip package architecture. This dimensional change enables vertical or closely-spaced horizontal interconnections that are orders of magnitude shorter than PCB traces, reducing RF losses while preserving cascading functionality
4Adaptability or versatility
If RF chips are interconnected on printed circuit boards, then cascading is achieved, but phase variations due to temperature changes increase
Solution Approach 1:
Multiple RF chips are nested within a single thermally controlled package environment, experiencing uniform temperature changes. The short interchip interconnections within the package minimize differential thermal expansion effects, maintaining stable phase relationships across temperature variations while enabling cascading operation
Data Source
AI summary
A radio frequency (RF) device includes a primary RF chip and at least one secondary RF chip, wherein the primary RF chip and the at least one secondary RF chip form a cascaded RF system. The primary RF chip and the at least one secondary RF chip are collectively assembled in a single multi-chip package.