RF Chip Package Layout With Mutual Inductance Control
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Solution Overview
Problem
The increasing integration of RF dies leads to reduced frequency characteristics due to parasitic inductances among peripheral circuit chips, bonding wires, and RF dies, necessitating a solution to suppress adverse reactions.
Innovation Solution
The RF chip package incorporates mutual inductance controllers, specifically conductor bars made of Cu, Al, or Au, to control the mutual inductances between peripheral circuit chips and the RF die, adjusting their dimensions to manage parasitic inductances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the level of integration of the RF die is increased, then the performance and functionality of the RF product is improved, but the frequency characteristics are reduced due to parasitic inductances
Solution Approach 1:
The patent introduces mutual inductance controllers (conductor bars) that generate beneficial mutual inductance to counteract the harmful parasitic inductance. By positioning conductor bars between peripheral circuit chips and the RF die, the system converts the problematic parasitic inductance into a controllable parameter that can be compensated for, thereby maintaining frequency characteristics while achieving high integration.
Solution Approach 2:
The patent changes the physical parameters of the conductor bars (length, width, thickness, material composition) to adjust the mutual inductance values. By varying these parameters, the system can optimize the compensation effect for different integration levels and frequency requirements, allowing the RF die to maintain performance despite increased integration.
2Reliability
If peripheral circuit chips are electrically connected to the RF die by wire bonding, then electrical connectivity is achieved, but parasitic inductances are generated that reduce frequency characteristics
Solution Approach 1:
The patent introduces conductor bars as intermediary elements between the peripheral circuit chips and the RF die. These conductor bars serve as magnetic field mediators that generate mutual inductance to counteract the parasitic inductance introduced by wire bonding. The intermediary conductor bars enable the system to maintain electrical connectivity while compensating for the harmful electromagnetic effects.
3Reliability
If mutual inductance controllers are added to control mutual inductances, then adverse reactions from parasitic inductances are suppressed, but device complexity increases
Solution Approach 1:
The patent merges the mutual inductance control function directly into the package structure by integrating conductor bars as part of the substrate or mounting structure. Rather than adding separate active control components, the design combines the structural support function with the electromagnetic compensation function, thereby suppressing parasitic effects without significantly increasing device complexity.
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
Effectively suppresses adverse reactions by controlling mutual inductances, thereby maintaining optimal frequency characteristics and performance.
Implementation Method 1
control the mutual inductances generated between peripheral circuit chips and an RF die
Data Source
AI summary
A radio frequency (RF) chip package includes: an RF die; a first peripheral circuit chip; a second peripheral circuit chip; a substrate having a -shaped step formed on a portion thereof so that the RF die is mounted on top of the step of the substrate and the first peripheral circuit chip and the second peripheral circuit chip are mounted on top of the substrate where no step is formed; a first mutual inductance controller for controlling the dimension of the mutual inductance between the first peripheral circuit chip and the RF die; and a second mutual inductance controller for controlling the dimension of the mutual inductance between the second peripheral circuit chip and the RF die.