Publication

A 50-mm<sup>2</sup> Crystal-Free Bidirectional WPDT System with Carrier-Reuse Clocking for Implantable Neural Interfaces

2026

Abstract

Neural implants require compact and energy-efficient wireless power and data transfer (WPDT) while avoiding reliance on costly on-board clock sources. This work presents a crystal-free, full-duplex WPDT link that reuses a 500-MHz power carrier as the sole system clock for synchronized downlink and uplink telemetry. A clock-data recovery (CDR)-less coherent ASK downlink achieves 5 Mb/s, while maintaining uninterrupted power transfer through a 6-mm implant loop. The recovered 500-MHz carrier also wirelessly locks a fast-settling UWB PLL, enabling a duty-cycled uplink supporting 5-500Mb/s. Burst-mode operation enables data-rate-scalable uplink power, ranging from 0.23 mW at 5 Mb/s to 4.93 mW at 500 Mb/s, and extends the uplink range to 40 cm using an on-chip antenna. The complete system, including the loop antenna and chip, occupies 50 mm2.

Official source

https://infoscience.epfl.ch/entities/publication/fd745184-b7cb-4ef8-9baa-3d265897c1d4

About this result

This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.

Graph Chat

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/fd745184-b7cb-4ef8-9baa-3d265897c1d4

About this result

Related concepts (32)

Ultra high frequency

Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one tenth of a meter (one decimeter). Radio waves with frequencies above the UHF band fall into the super-high frequency (SHF) or microwave frequency range. Lower frequency signals fall into the VHF (very high frequency) or lower bands.

Power-line communication

Power-line communication (also known as power-line carrier), abbreviated as PLC, carries data on a conductor that is also used simultaneously for AC electric power transmission or electric power distribution to consumers. A wide range of power-line communication technologies are needed for different applications, ranging from home automation to Internet access which is often called broadband over power lines (BPL).

Shortwave radio

Shortwave radio is radio transmission using shortwave (SW) radio frequencies. There is no official definition of the band, but the range always includes all of the high frequency band (HF), which extends from 3 to 30 MHz (100 to 10 metres); above the medium frequency band (MF), to the bottom of the VHF band. Radio waves in the shortwave band can be reflected or refracted from a layer of electrically charged atoms in the atmosphere called the ionosphere.