Dual-Antenna Implant Transceiver for Wireless Power and Data Throughput
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Solution Overview
Problem
Current biomedical implants face challenges in achieving high energy efficiency and data throughput due to limitations in power transfer and data communication, particularly in miniaturized forms that require wireless operation to avoid infection risks and improve spatio-temporal resolution for neural interfaces.
Innovation Solution
A wirelessly powered data transceiver system with a dual-antenna architecture integrated on a CMOS silicon chip, enabling simultaneous power delivery and data communication through separate frequency domains, utilizing a power management unit for efficient energy harvesting and storage, and employing amplitude-based modulation schemes to achieve high energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single antenna is used for both power delivery and data communication, then device complexity is reduced, but energy efficiency and data throughput deteriorate due to interference between power and data signals
Solution Approach 1:
The patent divides the single antenna function into two separate antennas: one dedicated to power delivery and another dedicated to data communication. This segmentation eliminates signal interference between power and data channels, thereby improving energy efficiency and data throughput while maintaining manageable device complexity through functional specialization.
Solution Approach 2:
The transceiver system is designed to perform multiple functions through integrated circuitry: receiving power wirelessly, harvesting energy from the received power signal, storing energy in on-chip capacitors, and transmitting data back to the external reader. This multi-functionality allows a single chip to replace multiple discrete components, offsetting the added antenna complexity.
2Use of energy by moving object
If battery power is used to achieve high data throughput, then energy availability is improved, but device size increases and wireless operation capability deteriorates
Solution Approach 1:
The patent replaces the mechanical/chemical battery system with a wireless electromagnetic power transfer system. Energy is delivered wirelessly through electromagnetic induction from an external reader, eliminating the need for physical batteries and enabling continuous operation without size constraints imposed by battery capacity.
Solution Approach 2:
The system operates by dynamically adjusting parameters such as the duty cycle of power reception, energy storage voltage levels in on-chip capacitors, and data transmission timing. These parameter changes allow the system to optimize between energy harvesting and data communication, achieving high data throughput without requiring large battery reserves.
3Ease of operation
If inductive coupling through coils is used for powering, then wireless operation is achieved, but energy transfer efficiency deteriorates due to misalignment and tissue interference
Solution Approach 1:
The system performs preliminary energy harvesting and storage before data transmission. On-chip capacitors are charged during dedicated power reception intervals, creating a buffer that decouples power reception from data transmission. This preliminary action allows the system to operate efficiently even when power transfer conditions vary, as stored energy can be used during data communication phases.
Solution Approach 2:
The system employs periodic duty-cycled operation where the transceiver alternates between power reception modes and data transmission modes. This periodic action allows optimization of each function at different times, improving overall energy efficiency by ensuring power is received when alignment is good and data is transmitted when power levels are sufficient from previously harvested energy.
4Measurement precision
If miniaturization is pursued to improve spatio-temporal resolution, then spatial resolution is improved, but energy harvesting capability deteriorates due to reduced antenna size
Solution Approach 1:
The patent implements a nested architecture where the transceiver chip is fully integrated on a single silicon die with minimal off-chip components. The dual-antenna system is nested within a compact form factor, with antennas and circuitry densely packed to achieve miniaturization while maintaining functional performance for both power reception and data transmission.
Solution Approach 2:
The system compensates for reduced antenna size by operating at higher frequencies and using advanced impedance matching techniques. The on-chip capacitors are sized and positioned to maximize energy harvesting efficiency from the available electromagnetic field, offsetting the reduced antenna aperture area through optimized electrical parameters and resonance tuning.
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 system achieves state-of-the-art energy efficiency and supports high data rates of up to 2.5 Mbps for receivers and 150 Mbps for transmitters, while maintaining a small form factor, addressing the power budget constraints and improving the spatio-temporal resolution of recorded signals.
Implementation Method 1
a power management unit for efficient energy harvesting and storage
Implementation Method 2
enabling simultaneous power delivery and data communication through separate frequency domains
Data Source
AI summary
Systems and methods for utilizing a small form-factor, wirelessly powered transceiver are disclosed. In one embodiment, a wireless powered transceiver includes a receive antenna configured to receive a receive signal, a transmit antenna configured to transmit a transmit signal, a power harvesting system including a rectifier circuit configured convert radio frequency energy from the receive signal into DC (direct current) voltage, and a power management unit (PMU) configured to set the operating mode and biasing condition of the receive and transmit circuitry blocks and provide DC voltage from the receive circuitry block to the transmit circuitry block to maintain a minimum voltage, a receiver circuitry block configured to provide energy from the receive signal to the power harvesting system, and a transmitter circuitry block including a data modulator circuit, the data modulator circuit configured to generate the transmit signal using DC voltage received from the power management unit.