Coupled Resonator Filter Layout With Overlapping Inductors
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Solution Overview
Problem
Existing coupled resonator filters, particularly those based on cavity designs, are limited in their ability to achieve high performance on-chip integration due to constraints in layout and magnetic coupling, leading to inefficient use of chip area and suboptimal frequency responses.
Innovation Solution
The integration of magnetic and electric coupling in resonator filters, combined with low-noise amplifiers, allows for improved frequency responses and reduced chip area by overlapping inductors, and the use of regenerative feedback circuits to boost the quality factor (Q) of the filters, enhancing sharpness and reducing parasitic losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cavity-based resonator filters are used, then filtering performance is achieved, but chip area efficiency deteriorates
Solution Approach 1:
The patent combines multiple resonators into a coupled resonator system where inductors are magnetically coupled together. This merging allows the filter to achieve the desired filtering performance through magnetic coupling between shared inductors, eliminating the need for separate, space-consuming cavity structures while maintaining effective signal filtering.
Solution Approach 2:
The patent implements nested inductor structures where inductors are placed in overlapping configurations. The first inductor overlaps with the second inductor, and the second inductor overlaps with the third inductor, creating a compact nested arrangement. This nesting achieves magnetic coupling between resonators while minimizing the overall chip area occupied by the filter structure.
2Reliability
If traditional resonator coupling is used, then filtering is achieved, but frequency response sharpness deteriorates
Solution Approach 1:
The patent introduces regenerative feedback circuits that feed a portion of the output signal back to the input through carefully designed feedback networks. This feedback mechanism enhances the quality factor (Q) of the resonators, resulting in sharper frequency responses and more selective filtering capability while maintaining stable operation through controlled feedback paths.
Solution Approach 2:
The patent employs dynamic coupling mechanisms where the magnetic coupling between inductors is optimized through their geometric arrangement and overlapping structures. The coupling coefficients are dynamically adjusted through the physical configuration of the inductors, allowing for enhanced frequency selectivity and sharper response characteristics without requiring additional active components.
3Device complexity
If inductors are placed separately, then magnetic coupling is simplified, but chip area efficiency deteriorates
Solution Approach 1:
The patent transitions from planar side-by-side inductor arrangements to three-dimensional overlapping configurations. By utilizing vertical stacking and overlapping layouts, the inductors achieve magnetic coupling through mutual inductance while occupying less horizontal chip area. This dimensional change allows compact integration without sacrificing coupling effectiveness.
Solution Approach 2:
The patent implements nested inductor structures where inductors are placed in overlapping configurations. The first inductor overlaps with the second inductor, and the second inductor overlaps with the third inductor, creating a compact nested arrangement. This nesting achieves magnetic coupling between resonators while minimizing the overall chip area occupied by the filter structure.
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 high-performance RF filtering and amplification with reduced chip area, improved frequency response sharpness, and effective noise suppression, suitable for applications in mobile devices and computers.
Implementation Method 1
Magnetic coupling between the first inductance and the second inductance magnetically couples the first parallel resonator and the second parallel resonator
Implementation Method 2
The first parallel resonator includes a first capacitance connected in parallel with a first inductance
Implementation Method 3
the use of regenerative feedback circuits to boost the quality factor (Q) of the filters, enhancing sharpness
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.