Low-Power Wireless Transceiver for Deeply Implanted Biomedical Devices

easygoing

Table of Contents
1 INTRODUCTION..................................................................................1
1.1 Motivation...............................................................................................1
1.2 Background.............................................................................................2
1.2.1 Existing Transceivers..........................................................................3
1.2.1.1 An RF-powered neural recording device: the Utah Array........3
1.2.1.2 Battery Powered Bion……………………………………..….5
1.2.1.3 A wide bandwidth, battery powered recorder: the SmartPill....7
2 BAND SELECTION AND DESIGN CONSIDERATIONS.................9
2.1 Band Analysis............................................................................................9
2.1.1 FCC Regulations................................................................................9
2.1.2 Power Considerations on Band Selection.........................................11
2.1.2.1 Receiver Power Savings..........................................................13
2.1.2.2 Transmitter Power Savings…………………………………..18
2.2 Band Selection..........................................................................................19
2.3 Design Goals.............................................................................................19
3 ARCHITECTURE & DESIGN.............................................................22
3.1 Architecture..............................................................................................22
3.1.1 OOK Receiver……………………………………………………...23
3.1.1.1 Differential Amplifier………………………………………..25
3.1.1.2 Schmitt Trigger………………………………………………28
3.1.1.3 Activity Detector……………………………………………..32
3.1.2 Manchester Decoder……………………………………………….34
3.1.2.1 Method for Decoding………………………………….……..35
3.1.2.2 All-Digital Manchester Decoder……………………….…….37
3.1.3 FSK Transmitter……………………………………………………40
3.1.3.1 LC Tank Modeling…………………………………………...41
3.1.3.2 LC Oscillator…………………………………………………43
3.1.3.3 Digital Power Control………………………………………..46
4 TEST RESULTS.....................................................................................48
4.1 Test Setup.................................................................................................48
4.2 OOK Receiver..........................................................................................49
4.2.1 Fully-Differential Amplifier……………………………………….49
4.2.2 Schmitt Trigger…………………………………………………….51
4.2.3 Activity Detector…………………………………………………..54
4.2.4 Entire Receiver…………………………………………………….56
4.3 Manchester Decoder................................................................................58
4.4 FSK Transmitter......................................................................................60
5 CONCLUSIONS AND FUTURE WORK............................................65
6 REFERENCES.......................................................................................68
ii
List of Tables
Table 1-1 Performance summary of the Utah Transceiver, as described in
[2]....................................................................................................................5
Table 1-2 Performance summary of the BPB in [3]................................................6
Table 1-3 Performance summary of the wireless endoscope in [6].........................7
Table 2-1 Summary of the transceiver design specifications................................21
Table 3-1 Transistor sizes and bias currents for the DA........................................27
Table 3-2 Transistor sizes used in the Schmitt Trigger.........................................30
Table 3-3 Transistor sizes for the activity detector................................................34
Table 4-1 Comparison of designed and estimated actual bias currents
and output resistance for the differential amplifier.......................................50
Table 4-2 Measured Schmitt trigger thresholds.....................................................53
Table 5-1 Comparison of Measured Results to Design Goals...............................68

s8553warrior

THANKS FOR SHARING

DukeLeon

bucuo kankan..........

willylin0130

当不了沙泼还是要支持的!!!感谢感谢~~~

opamp1201

very good!!very good!!

thanks

opamp1201

very good!!very good!!

thanks!!

sli103105

Thanks for sharing

hitpiano

谢谢
这个不错

yangtan19821215

Many thanks!

yangtan19821215

Many thanks!