Coupled Resonator Filter Layout for On-Chip Notch Response
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Solution Overview
Problem
Existing coupled resonator filters face challenges in achieving efficient integration on-chip due to layout constraints and limitations in magnetic and electric coupling, leading to increased chip area and suboptimal performance.
Innovation Solution
The integration of magnetic and electric coupling in resonator filters, combined with low-noise amplifiers, allows for reduced chip area and improved performance through overlapping inductor layouts and programmable capacitances, enhancing frequency response and noise suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional coupled resonator filters are implemented on-chip with separate magnetic and electric coupling, then filtering performance is achieved, but chip area increases and layout becomes complex
Solution Approach 1:
The patent combines magnetic coupling and electric coupling into a single integrated structure where inductors are overlaid to create both magnetic coupling between resonators and electric coupling through shared capacitive elements, eliminating the need for separate coupling mechanisms and reducing chip area
Solution Approach 2:
The patent employs three-dimensional overlay of inductor structures where inductors are placed in different layers and coupled through vertical alignment, utilizing the third dimension (vertical stacking) to achieve both magnetic and electric coupling simultaneously without increasing planar footprint
2Area of stationary object
If inductors are overlaid to achieve magnetic coupling, then chip area is reduced, but magnetic coupling control becomes difficult
Solution Approach 1:
The patent introduces intermediate capacitive elements that are shared between overlaid inductors, serving as mediators that enable precise control of both magnetic and electric coupling strengths independently, allowing manufacturing tolerances to be managed effectively
Solution Approach 2:
The patent enables independent adjustment of coupling parameters by varying the geometry and positioning of the overlaid inductor structures and associated capacitive elements, allowing optimization of magnetic coupling factor and electric coupling factor separately during design and fabrication
3Reliability
If third-order filter structure is used with magnetic coupling, then frequency response with notch is achieved, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple coupling mechanisms into a single third-order filter structure where three resonators are magnetically coupled in sequence with additional electric coupling paths, achieving the desired frequency response with notch while maintaining structural efficiency
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
This approach results in area-efficient on-chip filters with improved frequency response, noise suppression, and tunable bandwidth, optimizing performance in RF integrated circuits for applications like mobile phones and personal computers.
Implementation Method 1
Inductor L1 is magnetically coupled to inductor L2, which is magnetically coupled to inductor L3
Data Source
AI summary
A coupled resonator filter including a first parallel resonator including a first capacitance connected in parallel with a first inductance. The filter includes a second parallel resonator including a second capacitance connected in parallel with a second inductance and a third parallel resonator including a third capacitance connected in parallel with a third inductance. Magnetic coupling between the first inductance and the second inductance, between the second inductance and the third inductance, and between the first inductance the third inductance occurs in accordance with first, second and third coupling factors, respectively. A frequency response of the coupled resonator filter includes a notch when values of the first coupling factor, the second coupling factor and the third coupling factor satisfy predetermined conditions.