Single-Channel Bluetooth Beacon Transmitter IC for Low-Power Broadcast
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Solution Overview
Problem
Bluetooth Low Energy (BLE) devices face challenges in minimizing power consumption, especially in applications where battery replacement or recharging is not feasible, necessitating the development of efficient wireless communication protocols that reduce power usage while maintaining effective data transmission.
Innovation Solution
The implementation of a BLE device that operates as a transmitter only, using a free-running oscillator and a class-D power amplifier to directly modulate and amplify RF signals for broadcasting non-connectable and non-scannable data packets, thereby reducing power consumption and manufacturing costs while extending battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a full-duplex Bluetooth device with receiving hardware is used, then communication versatility is improved, but power consumption increases
Solution Approach 1:
The patent extracts and removes the receiving hardware components from the Bluetooth device, creating a transmitter-only (broadcast-only) device. This extraction eliminates the power consumption associated with receiving circuits, RF front-ends, and processing while maintaining the core transmission functionality needed for beacon applications.
Solution Approach 2:
The Bluetooth device functionality is segmented into separate transmission and reception functions. The patent implements only the transmission segment (broadcasting capability) while omitting the reception segment, allowing the device to perform solely as a beacon transmitter without the overhead of bidirectional communication hardware.
2Adaptability or versatility
If traditional Bluetooth modulation techniques are used, then communication compatibility is improved, but power consumption and device complexity increase
Solution Approach 1:
The patent replaces complex electronic modulation systems with direct digital modulation of the RF carrier. Instead of using traditional Bluetooth modulation circuits (GFSK, frequency synthesisers, phase-locked loops), the invention directly modulates the RF signal using digital data, significantly reducing power consumption and device complexity while maintaining Bluetooth compatibility.
Solution Approach 2:
The patent changes the modulation approach from analog/complex digital modulation to direct digital modulation. By altering the modulation parameter (using direct digital modulation instead of traditional Bluetooth modulation schemes), the device achieves compatibility with Bluetooth receivers while consuming significantly less power and requiring simpler hardware.
3Adaptability or versatility
If receiving hardware components are included, then device functionality is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts and removes receiving hardware components (RF front-end, demodulation circuits, reception processing units) from the Bluetooth device. This extraction reduces the bill of materials, simplifies the manufacturing process, and lowers production costs while the device retains sufficient functionality for beacon/transmitter applications.
4Ease of repair
If battery replacement or recharging is implemented, then device maintainability is improved, but user convenience deteriorates
Solution Approach 1:
The patent employs periodic transmission intervals and low-duty-cycle operation where the device transmits beacon signals at scheduled intervals rather than continuously. This periodic action allows the device to enter low-power states between transmissions, extending battery life to several years and reducing the frequency of battery replacement or recharging events, thereby improving user convenience.
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 approach achieves significant power savings, faster device discovery, and extended battery life by eliminating receiving hardware components and utilizing efficient modulation techniques, making it suitable for low-power devices in various applications.
Implementation Method 1
an oscillator, comprising an FBAR resonator, configured to generate an RF signal
Implementation Method 2
the RF signal is directly modulated based on the data signal to generate a modulated RF signal
Implementation Method 3
a power amplifier configured to amplify the modulated RF signal
Data Source
AI summary
Methods and systems described herein relate to broadcasting an advertisement event on a wireless channel. An example method includes generating, based on data, a data signal including one or more data packets, where each of the one or more data packets is a non-connectable and non-scannable data packet; generating an RF signal using an oscillator circuit; directly modulating the RF signal, based on the data signal, to generate a modulated RF signal; amplifying the modulated RF signal; broadcasting the amplified modulated RF signal on the wireless channel, where the amplified modulated RF signal is associated with the advertisement event.