Transcript
High Efficiency Dual-band Wireless Power and Bi-directional Data Telemetry 1 Jia ,
2 Kunling ,
1 Can ,
2 Ce
Zhou Geng Cao Shi 1School of Microelectronics, Shanghai Jiao Tong University 2UM-SJTU Joint Institute，Shanghai Jiao Tong University
Introduction
System Architecture
Biomedical implanted devices are widely used in modern biomedical applications such as: artificial cochlear, retinal prosthesis and so on.
Skin k12 Downlink Data
ASK data modulator
Class-E power amplifier
ASK Demodulator Recovered Downlink Data Clock
L2
L1
Recovery
Rectifier 13.56MHz Oscillator Artificial Cochlear
LDOs
Retinal Prosthesis
OOK Demodulator
Recovered Uplink Data
Background Wireless charging is safer and more reliable than implanted batteries and bi-directional data telemetry is required to transmit visual/audio data into implanted devices and meanwhile get feedback information.
L3
L4
Clcok Divider
OOK Modulator
Uplink Data
k34 Primary Circuit
Downlink ASK Modulation and Class E PA
Secondary Circuit
Power transmission：Class E Power Amplifier &Power Harvest Circuit Downlink telemetry: ASK modulation scheme, 13.56MHz carrier, 848kbps data Uplink telemetry: OOK modulation scheme, 424kHz carrier, 20kbps data
Test Results
Secondary Circuit Clock Recovery Circuit
Fast Comparator
LRFC
424 kHz Downlink Data Fast Comparator 13.56MHz Cristal Oscillator
424kHz Clock
11k
C1s
RL1
RL2
D1 LDO 1
L1
C1p Multiplier
Frequency Divider
13.56MHz Clock
Q1
R1 L2 Rp2
C3
Cp2
5V
D3 Power Receiver
ASK Modulation Signal Class E Power Amplifier
R2
C4
D4 Lchoke LDO 2
ASK Demodulation Signal
-5V
D2
Class E: Efficiency 90%-95% BJT: Much faster than MOS
Fast Comparator Downlink Data Signal 2k
Data Recovery Circuit
OOK Modulation and Demodulation Circuit
Power receiver: about 100mW ASK Data demodulation 13.56MHz clock recovery Clock divider: Obtain 424KHz uplink clock
13.56 MHz Recovered Clock Signal
424kHz Uplink Clock Signal after Clock Divider
Fast Comparator Recovered OOk Data
20kbps Uplink Data
Printed Spiral Coil
424k Clock Signal
L4
L3
Vref
Automatic Gain Control
OOK Modulation: Single CMOS OOK demodulation: AGC to control VPP to be 1V
Fit for high frequency Small Size Easily fabricated in batch
Acknowledgement Thanks for Prof. Wang’s instruction and Wang Peijun and Tang Yina’s previous work in wireless power transmission system. Also thanks for Qi Yunjie’s assistance and help.
OOK Modulation Signal (CH2) OOK Demodulation Signal L4 Received Signal (CH1) (CH1)
Conclusion We have realized a high efficiency wireless power and bi-directional data telemetry prototype with ASK and OOK modulation schemes which can transmit about 100mW power, 848kbps downlink data and 20kbps uplink data.
