Folded Inductor Topology With Integrated Capacitor for RF Harmonic Suppression
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Solution Overview
Problem
Conventional methods for addressing harmonic effects in RF devices, such as filtering, often require external filters that can interfere with circuit functionality and increase costs.
Innovation Solution
An inductor device is designed with a specific configuration of traces and a capacitor, allowing high-frequency signals to pass while blocking low-frequency signals, thus eliminating the need for external filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a filter is disposed outside of the circuit to filter harmonics, then the negative effect of harmonics is reduced, but the circuit function is affected and additional costs are generated
Solution Approach 1:
The patent combines the filter function with the inductor device by integrating a capacitor directly into the inductor structure. The capacitor is coupled between the first node and the second node formed by the trace configurations, creating a unified device that performs both inductance and filtering functions simultaneously, thereby eliminating the need for external filters and avoiding circuit function interference
Solution Approach 2:
The inductor device is designed to perform multiple functions: it provides inductance for RF signal processing while simultaneously filtering harmonics through the integrated capacitor. The trace configurations (first trace with first and second sub-traces, second trace with third and fourth sub-traces) create multiple nodes that enable both inductive operation and capacitive coupling for harmonic rejection, making the device universal in its functionality
2Object-affected harmful factors
If a filter is disposed outside of the circuit to filter harmonics, then the negative effect of harmonics is reduced, but additional costs are generated
Solution Approach 1:
The patent merges the filter function with the inductor device by integrating a capacitor directly into the inductor structure. The capacitor is coupled between the first node and the second node formed by the trace configurations, creating a unified device that performs both inductance and filtering functions simultaneously, thereby eliminating the need for external filters and avoiding circuit function interference
Solution Approach 2:
The inductor device is designed to perform multiple functions: it provides inductance for RF signal processing while simultaneously filtering harmonics through the integrated capacitor. The trace configurations (first trace with first and second sub-traces, second trace with third and fourth sub-traces) create multiple nodes that enable both inductive operation and capacitive coupling for harmonic rejection, making the device universal in its functionality
3Object-affected harmful factors
If the inductor device filters low frequency signals, then low frequency signals are blocked, but high frequency signals need to pass through
Solution Approach 1:
The patent utilizes the frequency-dependent impedance characteristics of the capacitor to achieve frequency-selective signal transmission. The capacitor's impedance varies with frequency (Zc = 1/jωC), allowing it to block low-frequency harmonic signals while permitting high-frequency operating signals to pass through with minimal attenuation, thus resolving the contradiction between filtering and signal transmission
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 inductor device effectively filters out low-frequency signals, reduces negative effects on circuits, and improves second harmonic suppression by approximately 20 dB, all while maintaining the integrity of the operating frequency.
Implementation Method 1
The capacitor is coupled between the first node and the second node. Therefore, based on the technical content of the present disclosure, the capacitor of the inductor device brings a function to filter low frequency, such that low frequency signal induced at the inductor device cannot pass but high frequency signal can pass the capacitor directly
Implementation Method 2
An induced signal caused by the main operating frequency can be cancelled by the folded inductor of the inductor device
Data Source
AI summary
An inductor device includes a first trace, a second trace, and a capacitor. The first trace includes a first sub-trace and a second sub-trace. The first sub-trace and the second sub-trace form a plurality of first wires together at a first side of the inductor device, and form a plurality of second wires together at a second side of the inductor device. The second sub-trace is coupled to one terminal of the first sub-trace at a first node. The third sub-trace and the fourth sub-trace form a plurality of third wires together at the first side of the inductor device, and form a plurality of fourth wires together at the second side of the inductor device. The fourth sub-trace is coupled to one terminal of the third sub-trace at a second node. The capacitor is coupled to the first node and the second node.