LC Resonator Time Delay Filter for Low-Loss Transceivers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional time delay elements in analog circuits, such as RF transceivers, face limitations due to excessive size, cost, complexity, poor manufacturability, high loss, and high amplitude or phase ripple, which hinder their performance.
Innovation Solution
The development of a time delay filter system utilizing LC resonators with integrated intra-filter coupling and input matching elements, constructed on a laminate or semiconductor substrate, providing a frequency-invariant group delay with low insertion loss and adjustable impedance, enabling high accuracy and reconfigurability without increasing circuit complexity or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional delay elements (ceramic filters, SAW filters, coaxial cables) are used, then time delay function is achieved, but size becomes excessive
Solution Approach 1:
The patent replaces traditional mechanical/physical delay elements (ceramic filters, SAW filters, coaxial cables) with an electronic circuit implementation using LC resonators. This substitution transitions from bulky physical structures to compact electronic components, achieving the same time delay function with significantly reduced size.
Solution Approach 2:
The patent achieves time delay by adjusting electrical parameters (inductance L and capacitance C values) of the LC resonators rather than relying on fixed physical dimensions. By changing these electrical parameters, the delay characteristics can be optimized without increasing physical size.
2Loss of time
If traditional delay elements are used, then time delay function is achieved, but cost becomes excessive
Solution Approach 1:
The patent employs inexpensive LC resonator components that can be easily manufactured and replaced if needed, replacing costly traditional delay elements. The use of standard inductors and capacitors in an integrated circuit approach reduces overall system cost.
Solution Approach 2:
By substituting expensive traditional delay elements with a custom-designed electronic circuit using readily available LC components, the patent significantly reduces manufacturing cost while maintaining the time delay function.
3Loss of time
If traditional delay elements are used, then time delay function is achieved, but device complexity increases
Solution Approach 1:
The patent combines multiple LC resonators into a single integrated circuit architecture, merging their functions to achieve the desired time delay. This consolidation reduces overall device complexity compared to using separate traditional delay elements.
Solution Approach 2:
The LC resonator circuit is designed to perform multiple functions (time delay, filtering, impedance matching) within a single integrated structure, reducing the need for additional separate components and thereby simplifying the overall device complexity.
4Loss of time
If traditional delay elements are used, then time delay function is achieved, but insertion loss becomes high
Solution Approach 1:
The patent optimizes the L and C parameter values of the resonators to minimize energy loss. By carefully selecting and tuning these parameters, the circuit achieves low insertion loss while maintaining the required time delay characteristics.
Solution Approach 2:
The LC resonators operate at their resonant frequencies, exploiting resonance to minimize energy dissipation. This resonant operation allows the circuit to achieve the time delay function with minimal insertion loss.
5Loss of time
If traditional delay elements are used, then time delay function is achieved, but amplitude ripple becomes high
Solution Approach 1:
The patent combines multiple LC resonators in a coordinated manner, where their combined frequency responses smooth out individual resonances. This merging effect reduces amplitude ripple in the overall frequency response while maintaining the time delay function.
Solution Approach 2:
By adjusting the L and C parameters of individual resonators, the patent optimizes their frequency responses to complement each other, thereby minimizing amplitude ripple across the operating bandwidth while preserving the desired time delay characteristics.
6Loss of time
If traditional delay elements are used, then time delay function is achieved, but phase ripple becomes high
Solution Approach 1:
The patent carefully selects and tunes the L and C parameters of the resonators to achieve linear phase response characteristics. By optimizing these parameters, the circuit minimizes phase ripple while maintaining the required time delay, ensuring stable signal transmission.
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 solution enhances the performance of full-duplex transceivers and other systems by providing high accuracy, adjustable, and reconfigurable time delay filtering with reduced size and cost, while maintaining low insertion loss and minimizing amplitude and phase ripple.
Implementation Method 1
A time delay filter system may include one or more LC resonators
Implementation Method 2
The resonator may include a capacitive element and an inductive element, coupled together into an LC circuit
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A time delay filter comprising a substrate comprising a first surface and a second surface opposite the first surface; a first LC resonator coupled to the substrate and comprising a first coupling point, a first capacitive element electrically coupled between the first coupling point and the first conductive region, and a first inductive element coupled between the first coupling point and the first conductive region, and comprising a first and second inductor tap; and a second LC resonator coupled to the substrate and comprising a second coupling point, a second capacitive element electrically coupled between the second coupling point and the first conductive region, and a second inductive element electrically coupled between the second coupling point and the first conductive region wherein the system group delays a signal output at a second coupling point relative to a signal input at the first coupling point.