wireless power and data over inductive links · 3 headquarters: leuven, belgium founded in 1998...
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www.ansem.com I © AnSem I CONFIDENTIAL
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 ?
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