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Wireless power and data over inductive links The technology for real ULP devices

Analog, RF and mixed-signal IC design & ASIC supply

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Personal introduction

Clemens Mensink

Business Development & Director

AnSem BV

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Founded in 1998 Headquarters: Leuven, Belgium

Subsidiary: Enschede, The Netherlands

AnSem is the leading European fabless ASIC Design Service company,

designing and delivering state-of-the-art analog, RF and mixed-signal integrated circuits to customers worldwide.

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Innovation on Chip

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Your Custom ASIC Headquarters Leuven, Belgium 2nd design center in Enschede, The Netherlands

Over 500 person years of expertise in ASIC design

+55 highly skilled employees

20 year track record

Worldwide customer base

Medical & Healthcare

Industrial

Automotive Consumer

Wildlife tracking

Smart home Smart grid

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The Principle of Inductive Coupling

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The Principle of Inductive Coupling

Inductive coupling is

bi-directional

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Near-Field versus Far-Field

Magnetic field impedance is lower in near field

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Inductive Coupled Applications

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Glaucoma Monitoring

Measurement of the eye pressure by measuring the eye deformation with a strain gauge Ultra-Low Power (ULP) is an absolute MUST !!

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Classical Glaucoma Measurement

Disadvantages: • Unpleasant • Snapshot, no continuous monitoring • Needs to be done with help of somebody else => Hospital

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Sensimed TriggerFish

24 Hours monitoring resulting in more accurate medicine prescription User friendly solution Portable

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Technical Challenges Contact Lens

1. Temperature increase < 1 degree C

2. 0.5% < EM-field Coupling-factor < 5% a. Requires power control b. High efficiency needed

3. Resolution strain gauge read-out: 17b

a. Analog to Frequency Converter b. 27.12MHZ clock, from 13.56MHz EM-field

4. Light insensitive

a. Metal shielding b. Differential circuits

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Smart Contact Lens Chip

Power feedback to reader

High efficient rectifier

Data transfer by

load modulation

Wheatstone bridge

drives relaxation VCO

for 17b digital conversion

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Load Modulation

Power control: 4b

Coupling > 0.5%

Modulation ~50%

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Rectifier

Greinacher circuit Cockcroft Walton Voltage multiplier

Vt - 0.2V

Vout = Vin + Vin_peak - Vdiode

Vout = Vin_peak_peak – 2Vdiode

Vout = Vin_peak_peak – 0.4V

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Analog to Frequency Converter

Relaxation Oscillator

Low noise sampling with 27.12MHz clock

t & T-t are measures for the resistive change of the strain gauge

Signal from Wheatstone bridge

Temperature variation compensation

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Chip realization

OnSemi i3t50 0.35µm high voltage

13.56 MHz loosely coupled inductive link for power and data

Backscattering communication via load modulation

17b sensor ADC with low noise sampling structure and temperature variation compensation

On-chip power management with excess power detection and regulation

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Application Data

24 Hour measurement

Left:

Eye blinking Right:

Ocular pulsation

Eye pressure profile

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AnSem Contribution

Development phase Prototype validation

Industrialization Supply chain management Definition phase High-level specs

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Fields of Expertise

Wireless

Ultra-low power management

High voltage

Sensor & MEMS data acquisition

Sensimed TriggerFish

Where several of AnSem’s capabilities come together.

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Questions ?