Tunable Reactance Circuits With Switchable Inductors and Capacitors
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Solution Overview
Problem
Existing electronic circuits lack the ability to efficiently tune reactance to control phase angles and energy storage characteristics, limiting their functionality in applications such as filters, resonant tank circuits, and phase shifters.
Innovation Solution
Implementing tunable capacitors and inductors with switchable elements on a silicon-on-insulator (SOI) substrate, using field effect transistors and microelectromechanical systems (MEMS) switches to dynamically adjust capacitance and inductance values, allowing precise control of reactance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed capacitors and inductors are used in electronic circuits, then the circuit structure is simple and reliable, but the ability to tune reactance and control phase angles is limited
Solution Approach 1:
The patent applies dynamics by transitioning from fixed passive elements to dynamically adjustable reactance elements. Switches are integrated with capacitors and inductors to enable real-time tuning of reactance values, allowing the circuit to adapt its electrical characteristics dynamically rather than being static.
Solution Approach 2:
The patent segments the reactance control function by dividing it into discrete adjustable units. Multiple switches are connected to capacitive and inductive elements, allowing independent control of each segment. This segmentation enables precise tuning by selectively activating or deactivating specific capacitive or inductive portions.
2Measurement precision
If traditional fixed passive elements are used, then manufacturing is straightforward, but precise control of phase angles and energy storage is not achievable
Solution Approach 1:
The patent implements multi-functionality by designing passive elements that serve both energy storage and phase control functions simultaneously. The same capacitive and inductive elements that store energy also provide phase shifting capability when combined with switches, eliminating the need for separate control components.
Solution Approach 2:
The patent replaces mechanical tuning mechanisms with electronic switching. Instead of physically adjusting capacitors or inductors, the invention uses electronically controlled switches to change reactance values, enabling precise digital control without mechanical components.
3Adaptability or versatility
If no reactance tuning capability is provided, then the device is simpler and more reliable, but functionality in filters, resonant tank circuits, and phase shifters is limited
Solution Approach 1:
The patent merges the functions of multiple components by integrating switches directly with capacitive and inductive elements to form unified reactance tuning units. This combination allows simultaneous control of magnitude and phase, reducing the need for separate control circuits and external tuning components.
Data Source
AI summary
Methods and apparatuses for use in tuning reactance are described. Open loop and closed loop control for tuning of reactances are also described. Tunable inductors and/or tunable capacitors may be used in filters, resonant circuits, matching networks, and phase shifters. Ability to control inductance and/or capacitance in a circuit leads to flexibility in operation of the circuit, since the circuit may be tuned to operate under a range of different operating frequencies.