Sensor/Antenna Interface IC for Implantable Biomedical Monitoring System

An interface IC for medical implants is implemented by using RF techniques of carrier synthesis and wireless powering. An external RF signal at 1.608 GHz is shared by an RF-dc converter and an injection-locked divide-by-four circuit, where most of the RF energy goes to the former for RF energy harve...

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Published inIEEE transactions on microwave theory and techniques Vol. 66; no. 3; pp. 1660 - 1667
Main Authors Lin, Ji-Yan, Chen, Hsiao-Chin, Yen, Ming-Yu
Format Journal Article
LanguageEnglish
Published New York IEEE 01.03.2018
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Analog to digital conversion
Analog to digital converters
Biomedical applications
divider
Energy harvesting
Implants
Integrated circuits
Noise generation
OOK transmitter
power amplifier (PA)
Power amplifiers
Radio frequency
Regulators
Surgical implants
Voltage control
Wireless communication
Wireless sensor networks
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Abstract An interface IC for medical implants is implemented by using RF techniques of carrier synthesis and wireless powering. An external RF signal at 1.608 GHz is shared by an RF-dc converter and an injection-locked divide-by-four circuit, where most of the RF energy goes to the former for RF energy harvesting and the rest of it serves as the injection signal for the latter to generate a low-phase-noise carrier at 402 MHz. Through an on-chip digital control unit and a successive approximation register analog-to-digital converter, biomedical signal in digital form can be obtained and then used to control the bias voltages of a power amplifier (PA) to perform the OOK modulation for wireless transmission. It requires an input level of 8 dBm to operate the chip. The 402-MHz carrier exhibits a phase noise of −136.7 dBc/Hz at an offset frequency of 1 MHz and the PA delivers an output power of −19.7 dBm.
AbstractList An interface IC for medical implants is implemented by using RF techniques of carrier synthesis and wireless powering. An external RF signal at 1.608 GHz is shared by an RF-dc converter and an injection-locked divide-by-four circuit, where most of the RF energy goes to the former for RF energy harvesting and the rest of it serves as the injection signal for the latter to generate a low-phase-noise carrier at 402 MHz. Through an on-chip digital control unit and a successive approximation register analog-to-digital converter, biomedical signal in digital form can be obtained and then used to control the bias voltages of a power amplifier (PA) to perform the OOK modulation for wireless transmission. It requires an input level of 8 dBm to operate the chip. The 402-MHz carrier exhibits a phase noise of −136.7 dBc/Hz at an offset frequency of 1 MHz and the PA delivers an output power of −19.7 dBm.
An interface IC for medical implants is implemented by using RF techniques of carrier synthesis and wireless powering. An external RF signal at 1.608 GHz is shared by an RF-dc converter and an injection-locked divide-by-four circuit, where most of the RF energy goes to the former for RF energy harvesting and the rest of it serves as the injection signal for the latter to generate a low-phase-noise carrier at 402 MHz. Through an on-chip digital control unit and a successive approximation register analog-to-digital converter, biomedical signal in digital form can be obtained and then used to control the bias voltages of a power amplifier (PA) to perform the OOK modulation for wireless transmission. It requires an input level of 8 dBm to operate the chip. The 402-MHz carrier exhibits a phase noise of -136.7 dBc/Hz at an offset frequency of 1 MHz and the PA delivers an output power of -19.7 dBm.
Author Chen, Hsiao-Chin
Yen, Ming-Yu
Lin, Ji-Yan
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SubjectTerms Analog to digital conversion
Analog to digital converters
Biomedical applications
divider
Energy harvesting
Implants
Integrated circuits
Noise generation
OOK transmitter
power amplifier (PA)
Power amplifiers
Radio frequency
Regulators
Surgical implants
Voltage control
Wireless communication
Wireless sensor networks
Title Sensor/Antenna Interface IC for Implantable Biomedical Monitoring System
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