Switched Tunable Capacitor Array for Multi-Band Load Impedance
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Solution Overview
Problem
Existing multi-frequency wireless devices face performance compromises due to size constraints and aesthetic design limitations, leading to inefficient power transfer across various frequency bands and operational conditions, such as antenna placement and usage scenarios, which prior art systems attempt to address with tunable elements but face limitations in achieving optimal performance across multiple frequency bands and use cases.
Innovation Solution
A tunable capacitor array with a decoder generating control signals to manage a range of reactance, comprising fixed capacitors coupled with switches, allowing for non-uniform quality factors and configurable topologies to adapt to variable load impedance, integrated into a single semiconductor die for efficient power transfer and impedance matching across frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed value components are used in the impedance matching circuit, then the device complexity is reduced, but the power transfer efficiency varies considerably across different frequency bands and usage conditions
Solution Approach 1:
The patent applies dynamics by replacing fixed value components with tunable elements (variable capacitors and inductors) that can dynamically adjust their impedance values based on operating conditions. This allows the impedance matching circuit to adapt to different frequency bands and usage scenarios, maintaining optimal power transfer efficiency across varying conditions rather than being fixed at a single operating point.
Solution Approach 2:
The patent implements parameter changes by varying the impedance values of circuit components (capacitance and inductance) to optimize performance across different frequency bands. The tunable elements allow continuous adjustment of electrical parameters, enabling the system to maintain reliable power transfer despite changes in operating frequency and environmental conditions.
2Reliability
If tunable elements are employed to compensate for changing antenna performance, then the power transfer efficiency is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges multiple functions into a single integrated circuit device that combines tunable capacitors, tunable inductors, and control circuitry on one substrate. This integration reduces the overall device complexity compared to using separate discrete components, while still providing the necessary tunability for optimal power transfer across different frequency bands and usage conditions.
Solution Approach 2:
The patent creates a universal impedance matching solution that can operate across multiple frequency bands and usage scenarios using a single circuit design with tunable elements. This multi-functional approach eliminates the need for separate matching circuits for different bands, reducing overall system complexity while maintaining high power transfer efficiency across all operating conditions.
3Device complexity
If multiple use cases are supported with fixed components, then the device complexity is minimized, but the antenna performance is compromised across different usage scenarios
Solution Approach 1:
The patent applies dynamics by using tunable impedance elements that can adapt their values based on the specific usage scenario. This allows the antenna system to maintain optimal performance whether the handset is held to the ear, placed in a pocket, or used with accessories, rather than being optimized for a single fixed configuration.
Solution Approach 2:
The patent implements parameter changes by adjusting the impedance values of circuit components to compensate for different antenna loading conditions caused by various usage scenarios. This ensures consistent antenna performance across all use cases without requiring separate optimized circuits for each scenario.
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 transmitter power, receiver sensitivity, and reduces power consumption while optimizing frequency band performance and specific absorption rate, enabling efficient operation across a wide range of frequencies and usage conditions without the need for unique tunable capacitor dies for each application.
Implementation Method 1
A tunable capacitor array with a decoder generating control signals to manage a range of reactance, comprising fixed capacitors coupled with switches
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.