Concentric Inductor Integration for Compact RF Semiconductor Devices
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Solution Overview
Problem
The existing semiconductor devices that incorporate matching circuits and filters for radio communication have a large footprint, which is a challenge for compact designs such as wearable devices and System on a Chip (SoC) applications.
Innovation Solution
A semiconductor device design that integrates a matching circuit and a filter using inductors wound substantially concentrically on a single plane, allowing for reduced footprint and efficient impedance transformation and harmonic suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If matching circuit and filter are incorporated separately into semiconductor device, then impedance matching and harmonic suppression functions are achieved, but footprint area increases
Solution Approach 1:
The patent combines the matching circuit and filter into a single integrated structure where the primary inductor serves both as a matching element and as part of the filter circuit. The secondary inductor and capacitor form a parallel resonance circuit that suppresses harmonics while the primary inductor provides impedance transformation. This merging of functions into shared components reduces the overall footprint area while maintaining both impedance matching and harmonic suppression capabilities.
2Area of stationary object
If footprint of semiconductor device is reduced for compact design, then integration density increases, but circuit performance may deteriorate
Solution Approach 1:
The patent implements a nested configuration where the secondary inductor is positioned inside the primary inductor, and the capacitor is placed within the space defined by the secondary inductor. This nested arrangement allows multiple circuit elements to occupy overlapping or adjacent spatial regions, maximizing space utilization while maintaining proper electrical isolation and coupling. The nesting enables compact design without compromising the performance of impedance matching or harmonic suppression functions.
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
This integration reduces the overall size of the semiconductor device while maintaining effective impedance matching and harmonic suppression, enabling more compact and efficient radio communication devices.
Implementation Method 1
a matching circuit that converts the transmission signal from a balanced signal to an unbalanced signal, wherein the matching circuit includes a primary inductor and a secondary indictor
Implementation Method 2
a filter circuit that restricts a frequency band of the transmission signal, wherein the filter circuit includes an inductor for a filter and a capacitor, and the inductor for a filter and the capacitor form a parallel resonance circuit
Data Source
AI summary
A semiconductor device (10) includes a transmitting circuit (12) that converts transmission data into a transmission signal with a specified frequency, an amplifier (13) that amplifies a power of the transmission signal, a matching circuit (14) that converts the transmission signal from a balanced signal to an unbalanced signal, and a filter circuit (14) that restricts a frequency band of the transmission signal. The matching circuit includes a primary inductor and a secondary inductor, the filter circuit includes an inductor for a filter, and the primary inductor, the secondary indictor and the inductor for a filter are wound substantially concentrically on one plane.