Secure contactless smartcard ASIC with DPA protection

Rakers, P.; Connell, L.; Collins, T.; Russell, Dale D.

doi:10.1109/4.910496

Cited by 68 publications

(26 citation statements)

References 6 publications

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“…A work presented in Ref. [47] addresses the concern. Nevertheless, an additive shunt-like isolation circuit is necessary, which again imposes additional implementation cost and power consumption on the implants.…”

Section: System Architecturementioning

confidence: 98%

“…In the energy-harvesting systems, most noncoherent ASK demodulators need at least one capacitor. Owing to the low-frequency carrier restricted, the capacitance of the capacitor involved is generally very large, which is not economical for an implanted device for which a small area is vital [18,33,34,[44][45][46][47]. The demodulator used, shown in Figure 5, is a capacitor-less work [57].…”

Section: 22mentioning

confidence: 99%

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A CMOS multichannel electrical stimulation prototype system

Gong

Yao

Shiue

2011

Circuit Theory & Apps

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SUMMARYWe developed an inductively powered integrated electronic prosthesis, allowing for the trade-offs among implant functionality, circuit complexity, power consumption, hardware cost, and integrity of data recovery, for a multichannel microstimulation circuitry. The proposed prosthesis features energy efficiency and is capable of up to 40 scan/s with 240 stimulus channels in mode I and three times resolution at the same scan rate in mode II under a carrier frequency of 2MHz. In order to satisfy future upgrade demands, the prototype has been constructed with a 16-channel-based stimulation scheme so that the spatial resolution of the design can be extended toward various experimental purposes. The circuit techniques used in the system are detailed. Results from fabricated chips using a 0.18-mm CMOS process are given as proof of concept.

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Section: System Architecturementioning

confidence: 98%

Section: 22mentioning

confidence: 99%

A CMOS multichannel electrical stimulation prototype system

Gong

Yao

Shiue

2011

Circuit Theory & Apps

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“…When a patient wears an inductively powered IMD and walks, the motion artifacts and vibrations affect d 23 and consequently the amplitude of the received signal. Even when d 23 is constant, any instantaneous changes in the IMD current consumption, due to stimulation for example, directly results in V 3 variations and deteriorates the quality of the ASK signal (Raker et al, 2001;Kaiser and Steinhaugen, 1995;Abrial et al, 2001). Hence, the ASK demodulator should be able to distinguish between the amplitude variations that result from noise, interference, and artifacts and those that represent the received data bits.…”

Section: Forward Telemetrymentioning

confidence: 99%

“…Since a larger change in the secondary loading results in easier detection of the back-telemetry signal in the primary coil, the series and parallel configurations are suitable for small and large loads (i.e., value of Z L ), respectively. Most RFID devices have very small power consumption and therefore use the parallel configuration (Finkenzeller, 2003;Raker et al, 2001;Kaiser and Steinhaugen, 1995;Abrial et al, 2001). However, implantable microstimulators may have much higher power consumption, especially when the stimulation is active.…”

Section: Backward Telemetrymentioning

confidence: 99%

Inductive Coupling

Nikita

2014

Handbook of Biomedical Telemetry

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INTRODUCTIONNear-field power transmission is a viable technique to wirelessly power up devices, such as sensors and actuators, with a wide range of power requirements or recharge their batteries from a short range without any direct electrical contact between the energy source and the device. Moreover, it is possible to use the same short-range wireless link to establish wide-band bidirectional data communication with those devices. Wireless IMDs are good examples of where near-field power and data transmission links can be used effectively. IMDs have been significantly improved by going through many generations since the invention of the first implantable pacemaker in 1958, and their importance in several state-of-the-art medical treatments is on the rise (Zhou and Greenbaum, 2009). They have made it possible to treat a wide range of ailments and disabilities from bradycardia (Allan, ), and loss of limbs (Kuiken et al., 2007). These devices need to transmit and receive information wirelessly across the skin barrier since breaching the skin with interconnect wires would be a source of morbidity for the patient and significantly increases the risk of infection. They also increase the risk of damage to the IMD.

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“…The rectifier circuit is a full wave rectifier composed of 4 PMOS transistors ( Figure 3) [9]. BJTs and diodes, while somewhat feasible in a commercial CMOS process, have problems in this type of process and are avoided.…”

Section: Rectifiermentioning

confidence: 99%

Power harvesting and telemetry in CMOS for implanted devices

Sauer¹,

Stanaćević²,

Cauwenberghs³

et al.

IEEE International Workshop on Biomedical Circuits and Systems, 2004.

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Implanted sensors offer many advantages to those studying the behavior of the human body. Unfortunately, the need to power and communicate with devices often requires tradeoffs that compromise their usefulness. We describe a power harvesting and telemetry chip that allows operation without wires or batteries. The chip has been fabricated in 0.5µm CMOS. The chip is able to supply 2mA at 3.3 V to associated sensors using inductive coupling. Tests reveal the characteristics of this chip under different loads and at different distances from the transmission coil. With the preliminary coils, functionality could be maintained with over 28mm between the two coils. To evaluate the performance of the chip in conditions mimicking implantation in the body, water bearing colloids were introduced between the two coils. This resulted in a small loss of transfer efficiency, with no change in the behavior of the chip.

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Secure contactless smartcard ASIC with DPA protection

Cited by 68 publications

References 6 publications

A CMOS multichannel electrical stimulation prototype system

A CMOS multichannel electrical stimulation prototype system

Inductive Coupling

Power harvesting and telemetry in CMOS for implanted devices

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