Battery-free 802.15.4 Receiver Carlos Prez-Penichet, Claro Noda, - PowerPoint PPT Presentation

Battery-free 802.15.4 Receiver Carlos Pérez-Penichet, Claro Noda, Ambuj Varshney, Thiemo Voigt

Backscattering Commodity Wireless Protocols Bluetooth Wi-Fi 802.15.4 3

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Backscattering Commodity Wireless Protocols Bluetooth Wi-Fi 802.15.4 7

Packet Level Interpreter Modulation Device

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Typical Receiver LPF ADC 0° Digital RF LO Demod 90° BPF LNA LPF ADC 10

Typical Receiver LPF ADC 0° Digital RF LO Demod 90° BPF LNA LPF ADC 10

LPF ADC 0° Digital RF LO Demod 90° BPF LNA LPF ADC 11

802.15.4 Signal LPF ADC 0° Digital RF LO Demod 90° BPF LNA LPF ADC 11

802.15.4 Signal LPF ADC 0° Digital RF LO Demod 90° BPF LNA LPF ADC 11

802.15.4 Signal External Carrier LPF ADC 0° Digital RF LO Demod 90° BPF LNA LPF ADC 11

802.15.4 Signal External Carrier MIXER BPF LPF ADC 0° Digital RF LO Demod 90° BPF LNA LPF ADC 11

802.15.4 Signal External Carrier MIXER BPF LPF ADC 0° Digital RF LO Demod 90° BPF LNA LPF ADC 11

802.15.4 Signal External Carrier MIXER IF AMP BPF LPF ADC 0° Digital RF LO Demod 90° BPF LNA LPF ADC 11

The 802.15.4 Signal 12

The 802.15.4 Signal 12

The 802.15.4 Signal f c + f f c f c f 12

802.15.4 Signal External Carrier MIXER IF AMP BPF LPF ADC 0° Digital RF LO Demod 90° BPF LNA LPF ADC 13

802.15.4 Signal External Carrier SLOPE MIXER IF AMP DETECTOR BPF LPF ADC 0° Digital RF LO Demod 90° BPF LNA LPF ADC 13

Slope Detector Filter transfer function Slope detector signals 0 5 Filter Output gain [dB] 10 Amplitude 15 20 Filter output Envelope 25 1 f 1 0.0 2.5 5.0 7.5 10.0 12.5 15.0 f + f 4 T c 4 T c time [ s] Frequency 14

802.15.4 Signal External Carrier SLOPE MIXER IF AMP DETECTOR BPF LPF ADC 0° Digital RF LO Demod 90° BPF LNA LPF ADC 15

802.15.4 Signal External Carrier + - SLOPE MIXER IF AMP DETECTOR COMPARATOR BPF LPF ADC 0° Digital RF LO Demod 90° BPF LNA LPF ADC 15

802.15.4 Signal External Carrier + DBP - SLOPE MIXER IF AMP DETECTOR COMPARATOR BPF LPF ADC 0° Digital RF LO Demod 90° BPF LNA LPF ADC 15

802.15.4 Signal External Carrier + DBP - SLOPE MIXER IF AMP DETECTOR COMPARATOR BPF 15

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Evaluation Range Integration Power 18

Power Consumption 19

Power Consumption 66 µW 19

Power Consumption 75 µW 19

Power Consumption 190 µW 19

Power Consumption 30 µW 19

361 µW

Range

Range 1.0 D=200cm PRR 0.5 0.0 0 25 50 75 100 125 150 175 200

Range 1.0 D=200cm PRR 0.5 0.0 0 25 50 75 100 125 150 175 200 1.0 D=300cm PRR 0.5 0.0 0 50 100 150 200 250 300

Range 1.0 D=200cm PRR 0.5 0.0 0 25 50 75 100 125 150 175 200 1.0 D=300cm PRR 0.5 0.0 0 50 100 150 200 250 300 1.0 D=500cm PRR 0.5 0.0 0 100 200 300 400 500 d [cm]

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TSCH Timeslot Guard Tx CCA Frame Tx ACK Rx Guard Rx Frame Rx ACK Tx Channel Offset Slotframe A->B B->C C->D A->B B->C C->D Time Offset Simon Duquennoy et al. TSCH and 6tisch for Contiki: Challenges, Design and Evaluation. IEEE DCOS 2017 23

TSCH Integration TX Interrogator RX RX Tag TX RX Carrier Generator CG 0 1 2 3 4 Slot Number 24

TSCH Integration TX Interrogator Carrier request RX RX Tag TX RX Carrier Generator CG 0 1 2 3 4 Slot Number 24

TSCH Integration TX Data request Interrogator Carrier request RX RX Tag TX RX Carrier Generator CG Carrier 0 1 2 3 4 Slot Number 24

TSCH Integration TX Data request Interrogator Carrier request RX RX Tag Data transmission TX RX Carrier Generator CG Carrier Carrier Carrier 0 1 2 3 4 Slot Number 24

TSCH Integration TX Data request Interrogator Carrier request RX RX Tag Data transmission TX RX Carrier Generator CG Carrier Carrier Carrier 0 1 2 3 4 Slot Number 24

TSCH Long-Term Reliability 25

802.15.4 Signal External Carrier + DBP - SLOPE MIXER IF AMP DETECTOR COMPARATOR BPF 26

TSCH Integration TX Data request Interrogator Carrier request RX RX Tag Data transmission TX RX Carrier Generator CG Carrier Carrier Carrier 0 1 2 3 4 Slot Number 27

361 µW

Thank you

RFID 30

A Low Power 2 . 4 GHz Superheterodyne Receiver Architecture. . . 31 J. F. Ensworth et al. In IEEE RFID , 2017

Comparator Baseband Threshold Amplitude 0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 1 0 0 0 0 1 1 1 0 1 1 1 1 0 1 0 1 1 1 0 0 1 1 0 1 1 0 0 1 1 1 0 0 0 0 0 0 1 1 1 0 0 0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 time [ s] 32

Mixer Conversion Gain vs. Input Signal Strength 10 20 Conversion Gain [dB] 30 40 CG power=4 dBm 50 CG power=-3 dBm CG power=-12 dBm 60 CG power=-32 dBm CG power=-53 dBm 70 CG power=-63 dBm 80 70 60 50 40 30 20 10 0 RF Input Power [dBm] 33

PRR vs. Input Power 1.00 0.98 0.96 PRR 0.94 CG power=-14 dBm CG power=-18 dBm 0.92 CG power=-22 dBm CG power=-27 dBm 0.90 50 45 40 35 TX power [dBm] 34

Sensitivity over 802.15.4 Channels 30 35 40 Sensitivity [dBm] 45 50 55 60 65 70 10 12 14 16 18 20 22 24 26 28 Channel 35

PRR vs. IF Amplifier Gain 1.0 0.8 0.6 PRR 0.4 G=48dB G=60dB 0.2 G=68dB G=88dB 0.0 0 100 200 300 400 500 600 700 800 D [cm] 36

Channel Rejection Ratio 30 24 25 22 20 Rejection Ratio [dB] 20 14 15 10 5 0 2 1 1 2 Channel Offset 37

CC2538 Receiver Filter Attenuation 0 20 Gain [dB] 40 60 80 15 10 5 0 5 10 15 Carrier offset [MHz] 38

Glossy Integration Initiator TX RX TX RX TX Repeater RX TX RX TX RX TX Receiver RX 0 1 2 3 4 5 6 7 Slot Number 39