Variable Impedance Network With Tunable Capacitor Array Matching
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Solution Overview
Problem
Existing multi-frequency wireless devices face inefficiencies due to antenna design constraints, which compromise performance across various frequency bands and operational environments, and prior art systems struggle to effectively manage power transfer and impedance matching using fixed components.
Innovation Solution
A tunable capacitor array with a decoder generating control signals to manage reactance, comprising fixed capacitors coupled with switches, allowing for non-uniform quality factors and configurable topologies to adapt to variable load impedances, optimizing performance parameters like transmitter power and frequency band performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed value components are used in the impedance matching circuit, then the circuit is simple and cost-effective, but the power transfer efficiency varies considerably across different frequency bands and operational environments
Solution Approach 1:
The patent applies dynamics by replacing fixed components with tunable components that can dynamically adjust their electrical characteristics. Specifically, tunable capacitors and inductors are used in the impedance matching circuit to adapt to different frequency bands and operational conditions, thereby maintaining optimal power transfer efficiency across varying conditions while managing circuit complexity through systematic design.
2Loss of energy
If tunable elements are employed to compensate for changing antenna performance, then power transfer efficiency improves across frequency bands, but the device complexity and die size increase
Solution Approach 1:
The patent merges multiple functions into integrated structures. Tunable capacitors and inductors are combined into unified impedance matching networks that can handle multiple frequency bands simultaneously. The control circuitry for multiple tunable elements is integrated to share common control signals and bias circuitry, reducing overall device complexity while maintaining improved power transfer efficiency across frequency bands.
Solution Approach 2:
The patent implements universality by designing impedance matching circuits that can operate across multiple frequency bands and operational conditions using the same tunable components. The tunable elements are designed to provide broad tuning ranges that cover various frequency bands, allowing a single circuit configuration to serve multiple functions rather than requiring separate circuits for each band.
3Device complexity
If multiple tunable capacitors are integrated on the same die to re-use control circuitry, then the number of I/O connection pads is reduced, but the parasitic capacitance increases
Solution Approach 1:
The patent extracts and removes harmful parasitic elements from the circuit design. Specific attention is given to minimizing parasitic capacitance by carefully designing the layout and interconnections of integrated tunable capacitors. Parasitic capacitances are extracted and compensated for through circuit design techniques, such as using series inductors to counteract parasitic capacitance effects, thereby reducing the overall harmful impact while maintaining the benefits of integration.
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 enhances the efficiency and adaptability of wireless devices by optimizing power transfer and impedance matching across multiple frequency bands and operational conditions, reducing parasitic capacitance and maintaining target quality factors, thereby improving overall performance and reducing die size and cost.
Implementation Method 1
an array of tunable switched capacitors including a plurality of fixed capacitors coupled to a plurality of switches. The plurality of switches can be controlled by the plurality of control signals to manage a tunable range of reactance of the array of tunable switched capacitors
Data Source
AI summary
The present disclosure may include, for example, a tunable capacitor having a decoder for generating a plurality of control signals, and an array of tunable switched capacitors comprising a plurality of fixed capacitors coupled to a plurality of switches. The plurality of switches can be controlled by the plurality of control signals to manage a tunable range of reactance of the array of tunable switched capacitors. Additionally, the array of tunable switched capacitors is adapted to have non-uniform quality (Q) factors. Additional embodiments are disclosed.