A Wide-Band Efficient Inductive Transdennal Power and Data Link with Coupling Insensitive Gain

Galbraith, Douglas C.; Soma, M.; White, Robert L.

doi:10.1109/tbme.1987.326076

Cited by 174 publications

(70 citation statements)

References 6 publications

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“…By choosing according to (7), which is derived by differentiating (4) with respect to at the resonance frequency, the best value for can be found for every given pair of and . Table I.…”

Section: Load Modulation For Back Telemetrymentioning

confidence: 99%

An Integrated Full-Wave CMOS Rectifier With Built-In Back Telemetry for RFID and Implantable Biomedical Applications

Ghovanloo

Atluri

2008

IEEE Trans. Circuits Syst. I

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Abstract-This paper describes the design and implementation of an integrated full-wave standard CMOS rectifier with built-in passive back telemetry mechanism for radio frequency identification (RFID) and implantable biomedical device applications. The new rectifier eliminates the need for additional large switches for load modulation and provides more flexibility in choosing the most appropriate load shift keying (LSK) mechanism through shorting and/or opening the transponder coil for any certain application. The results are a more robust back telemetry link, improved read range, higher back telemetry data rate, reduced rectifier dropout voltage, and saving in chip area compared to the traditional topologies. Index Terms-Back telemetry, CMOS, full-wave rectifier, implantable biomedical devices, inductive coupling, load shift keying, radio frequency identification (RFID), wireless.

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“…By choosing according to (7), which is derived by differentiating (4) with respect to at the resonance frequency, the best value for can be found for every given pair of and . Table I.…”

Section: Load Modulation For Back Telemetrymentioning

confidence: 99%

An Integrated Full-Wave CMOS Rectifier With Built-In Back Telemetry for RFID and Implantable Biomedical Applications

Ghovanloo

Atluri

2008

IEEE Trans. Circuits Syst. I

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“…A series-tuned transmitter requires a voltage source, whereas a parallel tuned transmitter is driven by a current source. A voltage source can be realized with two transistor switches which simply switch the input of the series tuned transmitter between the rails of the power supply (i.e., a class D amplifier, e.g., used in [2] and [6]). A single transistor can act as a current source, capable of driving a parallel tuned transmitter circuit (e.g., class C amplifier).…”

mentioning

confidence: 99%

High-efficiency coupling-insensitive transcutaneous power and data transmission via an inductive link

Zierhofer

Hochmair

1990

IEEE Trans. Biomed. Eng.

186

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Abstract-This paper presents a new approach for transmitting RF power and signal via an inductive link. Such an approach optimizes the power efficiency of the overall transmission scheme comprising the power amplifier plus the inductive link. Power amplification is based on the single ended class E concept. The power amplification stage is self oscillating, the oscillation frequency thus being influenced by the coupling of the coils. The resulting operating frequency offset yields an improved power transmission performance of the circuit since the oscillation frequency tracks the absolute transmission efficiency maximum. A detailed analysis is given. Realization of the described approach requires a minimal number of circuit components. Experimental and theoretical results are in good agreement.

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“…In a real application, usually both transmitter and receiver tank circuits are tuned at the carrier frequency by adding external capacitors, which will dominate the parasitic ones. Examples of tuned inductive links can be found in [1], [3], and [25]. [24].…”

Section: Resultsmentioning

confidence: 99%

“…Other implants with high power demands such as auditory and visual prostheses need to be powered by magnetic inductive coupling between an extracorporeal transmitter coil and an internal receiver coil, embedded in the implantable device [1]. Transcutaneous electromagnetic power, which is delivered by an externally generated RF magnetic field in the megahertz range, induces a sinusoidal voltage in the receiver inductive-capacitive (LC) tank circuit [1]- [3]. The next block should be a wideband rectifier to convert the ac signal to an unregulated dc supply voltage.…”

mentioning

confidence: 99%

Fully integrated wideband high-current rectifiers for inductively powered devices

Ghovanloo

Najafi

2004

IEEE J. Solid-State Circuits

267

103

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Abstract-This paper describes the design and implementation of fully integrated rectifiers in BiCMOS and standard CMOS technologies for rectifying an externally generated RF carrier signal in inductively powered wireless devices, such as biomedical implants, radio-frequency identification (RFID) tags, and smartcards to generate an on-chip dc supply. Various full-wave rectifier topologies and low-power circuit design techniques are employed to decrease substrate leakage current and parasitic components, reduce the possibility of latch-up, and improve power transmission efficiency and high-frequency performance of the rectifier block. These circuits are used in wireless neural stimulating microsystems, fabricated in two processes: the University of Michigan's 3-m 1M/2P N-epi BiCMOS, and the AMI 1.5-m 2M/2P N-well standard CMOS. The rectifier areas are 0.12-0.48 mm 2 in the above processes and they are capable of delivering 25 mW from a receiver coil to the implant circuitry. The performance of these integrated rectifiers has been tested and compared, using carrier signals in 0.1-10-MHz range.

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A Wide-Band Efficient Inductive Transdennal Power and Data Link with Coupling Insensitive Gain

Cited by 174 publications

References 6 publications

An Integrated Full-Wave CMOS Rectifier With Built-In Back Telemetry for RFID and Implantable Biomedical Applications

An Integrated Full-Wave CMOS Rectifier With Built-In Back Telemetry for RFID and Implantable Biomedical Applications

High-efficiency coupling-insensitive transcutaneous power and data transmission via an inductive link

Fully integrated wideband high-current rectifiers for inductively powered devices

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