Integrated Delay Modules for RF Transceivers
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Solution Overview
Problem
Traditional delay elements in analog circuits, such as RF transceivers, face issues like excessive size, cost, complexity, poor manufacturability, high loss, and high amplitude or phase ripple, limiting their performance.
Innovation Solution
The integration of LC-resonator-based time delay filters in a modular configuration, utilizing LC resonators and signal couplers to provide discrete-step variable delays with low insertion loss and frequency-invariant group delay, 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 device size becomes excessive
Solution Approach 1:
The patent replaces traditional mechanical/physical delay elements (ceramic filters, SAW filters, coaxial cables) with an integrated circuit implementation using transmission lines and delay elements fabricated on a semiconductor substrate. This substitution of mechanical systems with electronic integrated circuits dramatically reduces device size while maintaining the time delay function.
Solution Approach 2:
The patent integrates multiple delay elements and transmission lines within a compact integrated circuit structure, nesting functional components inside each other to achieve maximum space utilization. The delay elements are embedded within the IC substrate, with transmission lines routed through multiple layers, creating a nested configuration that minimizes overall device volume.
2Loss of time
If traditional delay elements are used, then time delay function is achieved, but manufacturing cost becomes excessive
Solution Approach 1:
The patent combines multiple delay elements, transmission lines, and associated circuitry into a single integrated circuit package. By merging these previously separate components into one unified IC, the patent eliminates the need for multiple discrete parts, reducing assembly complexity and manufacturing cost while maintaining the required time delay functionality.
Solution Approach 2:
The replacement of traditional discrete delay elements with an integrated circuit implementation using standard semiconductor fabrication processes significantly reduces manufacturing cost. The IC can be produced using established CMOS or bipolar technology, enabling high-volume production at low cost compared to assembling traditional delay elements.
3Loss of time
If traditional delay elements are used, then time delay function is achieved, but device complexity becomes excessive
Solution Approach 1:
The patent replaces complex assemblies of traditional delay elements with a simplified integrated circuit implementation. The IC uses standard transmission line theory and delay element circuits that can be designed and simulated using conventional EDA tools, significantly reducing design and manufacturing complexity compared to traditional approaches.
4Loss of time
If traditional delay elements are used, then time delay function is achieved, but signal loss becomes excessive
Solution Approach 1:
The patent replaces traditional delay elements with an integrated circuit implementation using transmission lines with controlled impedance and low-loss dielectric materials. The IC structure allows for optimized signal paths with minimal reflections and losses, and the delay elements can be designed to operate at optimal impedance matching, significantly reducing signal loss compared to traditional coaxial cables or ceramic filters.
5Loss of time
If traditional delay elements are used, then time delay function is achieved, but amplitude ripple becomes excessive
Solution Approach 1:
The patent replaces traditional delay elements with an integrated circuit implementation where the transmission lines and delay elements can be precisely controlled during fabrication. The IC process allows for tight control of line dimensions, impedance, and component values, resulting in minimal amplitude ripple. The delay elements can be designed with flat group delay characteristics through proper circuit topology selection and optimization.
6Loss of time
If traditional delay elements are used, then time delay function is achieved, but phase ripple becomes excessive
Solution Approach 1:
The patent replaces traditional delay elements with an integrated circuit implementation where phase characteristics can be precisely controlled. The IC structure allows for accurate control of transmission line lengths, characteristic impedances, and component values, enabling design of delay elements with linear phase response and minimal phase ripple across the operating bandwidth.
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 accurate, adjustable time delays in a space- and cost-effective manner, suitable for various applications including self-interference cancellation circuits.
Implementation Method 1
LC-resonator-based time delay filters
Implementation Method 2
LC-resonator-based time delay filters
Implementation Method 3
signal couplers
Data Source
AI summary
An analog time delay filter circuit including a first delay circuit block arranged in a modular layout, having a first time delay filter, a first input, a first output, and first and second pass-throughs; and a second delay circuit block arranged in the same modular layout, having a second time delay filter, a second input, a second output, and third and fourth pass-throughs.