Switched Inductor Tuning for High-Q VCO Tank Range
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Solution Overview
Problem
Existing technologies face challenges in maintaining a high Q ratio while increasing the tuning range of high-frequency circuits, often leading to a 'death spiral' where power consumption and capacitor size continuously increase.
Innovation Solution
The use of a switched inductor in parallel with a switched capacitor array allows for a broader frequency tuning range without degrading the Q ratio, achieved by connecting multiple switched inductors of varying sizes in parallel to a VCO tank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switched inductor is used to increase tuning range, then the frequency tuning range is expanded, but the Q ratio deteriorates
Solution Approach 1:
The inductor is divided into multiple discrete coils with different inductance values. Each coil can be independently switched into the circuit, allowing the total inductance to be segmented and reconfigured. This segmentation enables a broader tuning range while maintaining high Q ratio because each individual coil can be optimized for high Q, and the switching mechanism selects among them rather than relying on a single continuously variable inductor.
Solution Approach 2:
The inductor configuration is made dynamic through electronic switching mechanisms that can rapidly change which coils are active in the circuit. This dynamic reconfiguration allows the inductance value to be adjusted in real-time to achieve different frequency tuning ranges while maintaining optimal Q ratio performance for each configuration state.
2Use of energy by moving object
If power consumption is reduced, then energy efficiency improves, but the ability to maintain high Q ratio while expanding tuning range deteriorates
Solution Approach 1:
The switched inductor operates by periodically switching between different coil configurations based on the desired frequency. Instead of continuously adjusting inductance (which would require continuous power), the system uses periodic switching among discrete high-Q coil states. This periodic action achieves the required tuning range while consuming minimal power, as the switches only need to change state rather than maintain continuous adjustment.
3Device complexity
If a single inductor is used, then the structure is simple, but the tuning range is limited
Solution Approach 1:
Multiple inductor coils are merged into a single integrated inductor structure that functions as one component. The individual coils are physically combined and electrically connected through switching mechanisms, creating a unified inductor assembly that provides multiple inductance values. This merging approach expands the tuning range while keeping the overall structure relatively simple and compact, as all coils share common terminals and are controlled by a single switching network.
Data Source
AI summary
In an embodiment, an apparatus and system comprising a first inductor with a first diameter; and a switched inductor including a metal layer and a switch; wherein when the switch is closed the switch connects the metal layer of the switched inductor to form an inductor with a parallel circuit enabling current to flow through the switched conductor; and wherein when the switch is open, current is not enabled to flow through the switched conductor. In another embodiment, a method for tuning a high-Q inductor, the method comprising closing a switch of a switched inductor, wherein the switch connects the switched inductor to a first inductor; wherein closing the switch enables current to flow though the switched inductor as well as the first inductor to change the inductance of the high Q inductor.