Single-Layer LC Oscillator for Low-Power Stable IoT RF Sensing
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Solution Overview
Problem
Conventional oscillators used in IoT devices are limited by high power consumption, large size, high cost, and difficulty in implementation on low-cost inlay substrates, and require calibration to specific frequencies, making them unsuitable for low-power, compact, and cost-effective IoT applications.
Innovation Solution
An inductor-capacitor (LC) oscillator with a single-layer inductor in a spiral pattern within an inlay substrate, integrated with a capacitor and an oscillator calibration circuit that uses a signal frequency detector and frequency locking circuit to calibrate the oscillator based on received over-the-air signals, allowing it to function as a temperature sensor with high quality factor and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional oscillator is used in IoT devices, then it can generate RF carrier signals, but it consumes high power and occupies large area
Solution Approach 1:
The patent changes the physical parameters of the oscillator by using a single-layer inductor with high quality factor and adjusting capacitor values to achieve both low power consumption and frequency stability. The inductor is designed with specific geometric parameters (spiral pattern, trace width, spacing) to optimize the Q-factor while maintaining compact size.
Solution Approach 2:
The patent extracts the oscillator from traditional multi-layer PCB implementations and places it directly on a single-layer inlay substrate. This extraction simplifies the overall structure, reduces power consumption, and eliminates the need for complex calibration circuits while maintaining frequency stability.
2Ease of manufacture
If conventional oscillators are implemented on inlay substrates, then they can be used in low-cost IoT devices, but they require complex calibration circuits and have large area
Solution Approach 1:
The oscillator design is self-calibrating through its high Q-factor single-layer inductor and capacitor combination, which naturally compensates for manufacturing tolerances. This eliminates the need for external calibration circuits, reducing device complexity while maintaining ease of manufacture on inlay substrates.
Solution Approach 2:
The single-layer inductor structure serves multiple functions: it provides the resonant element for oscillation, acts as a temperature compensating element, and eliminates the need for separate calibration circuitry. This multi-functionality reduces overall device complexity while maintaining manufacturability on inlay substrates.
3Reliability
If conventional oscillators are used, then they can generate RF signals, but they require frequent calibration and have poor temperature stability
Solution Approach 1:
The patent selects specific parameter values for the inductor (high Q-factor, optimized spiral geometry) and capacitor (temperature-stable dielectric material) to inherently compensate for temperature variations. This parameter optimization provides wide temperature stability without requiring frequent calibration, reducing time loss.
4Area of moving object
If multi-layer inductors are used to reduce area, then compactness is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent uses a spiral pattern in the single-layer inductor design, which efficiently packs the inductance into a compact area by utilizing the planar dimension. This spiral configuration achieves area reduction without requiring multiple layers, maintaining manufacturing simplicity while minimizing the inductor footprint.
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 LC oscillator achieves low power consumption, high temperature stability, and reduced calibration needs, enabling it to function effectively as a temperature sensor and a low-power RF carrier signal generator, overcoming the limitations of conventional oscillators in IoT devices.
Implementation Method 1
a single layer inductor disposed within a single layer inlay, wherein the single layer inductor is configured in a spiral pattern within the layer of the inlay
Implementation Method 2
a capacitor included in the integrated circuit, wherein the capacitor is connected to the single layer inductor
Implementation Method 3
The oscillator 120 generates a radio frequency (RF) carrier signal that may carry the data signal generated by the BLE packetizer 110
Data Source
AI summary
An LC oscillator is provided. The LC oscillator includes a single layer inductor disposed within a single layer inlay, wherein the single layer inductor is configured in a spiral pattern within the layer of the inlay, wherein an integrated circuit is mounted on the single layer inlay; and a capacitor included in the integrated circuit, wherein the capacitor is connected to the single layer inductor.