Coupled-Inductor Power Combiner for Smaller RF Splitter Footprint
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Solution Overview
Problem
The shrinking size of silicon components in electronic devices leads to non-scalable components like inductors in splitter/combiner circuitry, limiting the reduction of surface area and efficiency in communication circuitry.
Innovation Solution
Coupling inductors inductively in the splitter/combiner circuitry to reduce the overall surface area occupied, and adjusting capacitors to absorb parasitic capacitance and reduce component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional splitter/combiner circuitry with separate inductors is used, then filtering function is achieved, but silicon footprint becomes non-scalable
Solution Approach 1:
The patent combines multiple inductor functions into a single shared inductor that is coupled to both capacitive dividers. This shared inductor performs the inductive function for both signal paths simultaneously, eliminating the need for separate inductors and reducing the overall silicon footprint while maintaining the filtering capability.
Solution Approach 2:
The shared inductor serves multiple functions: it provides inductive coupling for both capacitive dividers, enables filtering of out-of-band frequencies, and supports beam-forming operations. This multi-functional design allows the circuitry to maintain versatility while reducing component count and area.
2Reliability
If more components are used in splitter/combiner circuitry, then filtering performance is improved, but device complexity increases
Solution Approach 1:
By merging the inductive functions into a single shared inductor, the patent reduces the total component count while preserving the filtering performance. The shared inductor works in conjunction with the capacitive dividers to achieve the necessary frequency rejection and signal separation.
Solution Approach 2:
The patent extracts the common inductive function from the individual signal paths and places it in a shared position. This extraction eliminates redundant components and simplifies the overall circuit architecture while maintaining the essential filtering and signal processing functions.
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
The solution reduces the silicon footprint and improves the efficiency of the splitter/combiner circuitry by minimizing surface area and optimizing signal transmission.
Implementation Method 1
a first inductor coupled to the first capacitive element and the third capacitive element, and a second inductor coupled to the second capacitive element and the fourth capacitive element, the first inductor and the second inductor being configured to inductively couple to one another
Data Source
AI summary
An electronic device includes multiple antennas to transmit one or more signals, and a transmitter electrically coupled to the antennas. The transmitter has splitter circuitry that receives an input signal and generates the signals. The splitter circuitry includes a pair of inductive elements that are inductively coupled together. The splitter circuitry includes capacitive elements to absorb parasitic input and output capacitance. In additional or alternative embodiments, the splitter circuitry may be in the form of combiner circuitry and disposed in a receiver of the electronic device.