Trimmable Wire LC Tank Frequency Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for adjusting the central frequency of LC tank circuits either reduce the Q factor or increase the layout area, failing to provide a solution that can adjust frequency without affecting the Q factor or expanding the layout area.
Innovation Solution
A central frequency adjustment device and adjustable inductor layout that uses trimmable wires and capacitors to adjust the inductance and capacitance of LC tank circuits, allowing for frequency adjustments without reducing the Q factor and minimizing layout area, by cutting off trimmable wires to alter the inductance and capacitance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If switching capacitors or inductors are used to adjust central frequency, then frequency adjustment is achieved, but parasitic resistance is generated reducing the Q factor
Solution Approach 1:
The patent extracts and removes the problematic switching elements (MOS transistors) that generate parasitic resistance. Instead, it uses trimmable wires made of low-resistance materials to adjust capacitance and inductance values, thereby eliminating the source of parasitic resistance while maintaining frequency adjustment capability.
Solution Approach 2:
The patent changes the physical parameters of the adjustment mechanism by using trimmable wires with varying lengths and configurations. By trimming different portions of the wire, the capacitance and inductance values are adjusted without introducing parasitic resistance, thus maintaining high Q factor while achieving frequency tuning.
2Reliability
If trimmable wire is used to adjust capacitance, then Q factor is maintained, but frequency adjustment is limited to increase only
Solution Approach 1:
The patent segments the inductor into multiple sections with different numbers of turns, and provides multiple trimmable wires connected to different tap points. By trimming different combinations of these wires, both capacitance and inductance can be adjusted independently, enabling both frequency increase and decrease while maintaining Q factor.
Solution Approach 2:
The patent creates a dynamic adjustment system where multiple trimmable wires can be trimmed to different extents, allowing the circuit to adaptively achieve both frequency increase and decrease. This dynamic configuration enables versatile frequency adjustment beyond the unidirectional limitation of conventional trimmable capacitor approaches.
3Adaptability or versatility
If additional inductors are connected in series to reduce central frequency, then frequency is reduced, but layout area increases
Solution Approach 1:
The patent segments a single inductor into multiple sections with different numbers of turns, connected in series. By trimming wires connected to different tap points of these sections, the effective inductance can be adjusted to reduce central frequency without adding external inductor components, thereby avoiding layout area expansion.
Solution Approach 2:
The patent makes a single inductor structure serve multiple functions: it provides both the base inductance and the adjustable inductance segments. This multi-functional design eliminates the need for additional inductor components that would be required to reduce frequency, thus maintaining compact layout area while achieving frequency reduction capability.
Data Source
AI summary
The present invention provides a central frequency adjustment device and adjustable inductor layout; wherein, the central frequency adjustment device is applied in an inductor/capacitor tank (LC tank) for adjusting the central frequency of the LC tank. The device comprises a first inductor with a first end and a second end; a second inductor with one end coupled with the second end of the first inductor; and, a first trimmable wire connected to the first inductor in parallel and to the second inductor in series, which adjusts the central frequency by cutting off the first trimmable wire.