1. Wireless data and power Brian McKinney Michael Vincent

2. What we are doing  Ultimate goal is to create a device capable of precisely stimulating tissue in-vivo without connection to outside  Lack of external connection implies IC needs to derive both power and data from RF signal

3. Test Bench  Not a mixed signal IC but needed for simulation and testing purposes  Generates random data  Frames random data (e.g. start/stop and parity bits)  Modulates carrier (ASK) with framed data

4. Regulator  “Buck” type step down switching regulator

5. Ramp Generator

6. Comparator

7. Switch Side

8. Specifications TargetActual Vin (V)5 – 8~4.5 – 7 Vout (V)3.3~3.3 Power (mW)25~40 Efficiency (%)50~73 Fs (kHz)10050 C (uF)10.5 L (uH)11

9. Results

10. Data Path Envelope Detector Input: AM Signal (4MHz) Output: 100 Kbps “Dirty Data” Clock Recovery Input: 100 Kbps “Dirty Data” Output: 100 KHz Synchronous Clock Timing Control Inputs: 100 Kbps “Dirty Data” 100 KHz Clock Outputs: Clean Clock, Clean Data, Frame Strobe

11. Behavioral Simulation

12. Bandpass Filter

13. Delay-Lock Loop

14. PLL Theory

15. Phase Detector Operation  clk = 0  data = 0 V out  V DD  clk = 0  data = -(¾)  V out  (¼)V DD  clk =  /2  data = 0 V out  (½)V DD

16. VCO Current Starved VCO V out-filter range: 0 – V DD f min = 90 kHz f max = 105 kHz (½)V DD  f typ = 100 kHz

17. Full Data Path Simulation

18. Conclusions and Q&A