A Matching Technique for Biphasic Stimulation Pulse

Lee, E.K.F.; Lam, A.

doi:10.1109/iscas.2007.378031

Cited by 36 publications

(9 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Table 1 shows the major characteristics of these two stimulators. Note that stimulation frequency and stimulation pulse width are typical 12 . The switching frequency was adjusted to allow output voltage stabilization before the end of the “on period” of the converter in PS1 (see Fig.…”

Section: Methodsmentioning

confidence: 99%

Power strategy in DC/DC converters to increase efficiency of electrical stimulators

et al. 2016

View full text Add to dashboard Cite

Power efficiency is critical for electrical stimulators. Battery life of wearable stimulators and wireless power transmission in implanted systems are common limiting factors. Boost DC/DC converters are typically needed to increase the supply voltage of the output stage. Traditionally, boost DC/DC converters are used with fast control to regulate the supply voltage of the output. However, since stimulators are acting as current sources, such voltage regulation is not needed. Banking on this, this paper presents a DC/DC conversion strategy aiming to increase power efficiency. It compares, in terms of efficiency, the traditional use of boost converters to two alternatives that could be implemented in future hardware designs.

show abstract

Section: Methodsmentioning

confidence: 99%

Power strategy in DC/DC converters to increase efficiency of electrical stimulators

et al. 2016

View full text Add to dashboard Cite

show abstract

“…An analog negative feedback technique to sample and hold a correction current to improve current matching has been used in [29]. A similar technique, dynamic current matching, is used in [30].…”

Section: A Previous Workmentioning

confidence: 99%

A Fully Intraocular High-Density Self-Calibrating Epiretinal Prosthesis

Monge

Raj

Nazari

et al. 2013

IEEE Trans. Biomed. Circuits Syst.

View full text Add to dashboard Cite

This paper presents a fully intraocular self-calibrating epiretinal prosthesis with 512 independent channels in 65 nm CMOS. A novel digital calibration technique matches the biphasic currents of each channel independently while the calibration circuitry is shared among every 4 channels. Dual-band telemetry for power and data with on-chip rectifier and clock recovery reduces the number of off-chip components. The rectifier utilizes unidirectional switches to prevent reverse conduction loss in the power transistors and achieves an efficiency > 80%. The data telemetry implements a phase-shift keying (PSK) modulation scheme and supports data rates up to 20 Mb/s. The system occupies an area of 4.5 ×3.1 mm². It features a pixel size of 0.0169 mm² and arbitrary waveform generation per channel. In vitro measurements performed on a Pt/Ir concentric bipolar electrode in phosphate buffered saline (PBS) are presented. A statistical measurement over 40 channels from 5 different chips shows a current mismatch with μ = 1.12 μA and σ = 0.53 μA. The chip is integrated with flexible MEMS origami coils and parylene substrate to provide a fully intraocular implant.

show abstract

“…In [13], they use cathodic current to generate an similar magnitude anodic current. In [14], they compare anodic current with cathodic current, and use the result to adjust the mismatch between them. However, the difference between anodic and cathodic current can't be eliminated perfectly.…”

Section: A Human Safetymentioning

confidence: 99%

Challenges in circuits for visual prostheses

Chen

Tang

Wang

2013

2013 IEEE International Symposium on Circuits and Systems (ISCAS2013)

View full text Add to dashboard Cite

This paper serves as an introduction to visual prostheses. Visual prostheses have attracted a lot of attention in recent years. With the potential of helping the blind to regain or improve their vision, researchers have been trying to tap into the visual pathways using their novel circuits and systems and interact with the brain through electronic ways. Having already benefited a lot from recent advances in electronics, MEMS, materials, and other sciences and technologies, and having already achieved a lot in the past, research in this field still prompt researchers to go beyond what current technologies can offer. In particular, this paper will review the challenges associated with circuit design for the visual prostheses, for example, the high-voltage compliant circuits, high-density drivers, power management schemes, and efficient stimulation.I.

show abstract

A Matching Technique for Biphasic Stimulation Pulse

Cited by 36 publications

References 4 publications

Power strategy in DC/DC converters to increase efficiency of electrical stimulators

Power strategy in DC/DC converters to increase efficiency of electrical stimulators

A Fully Intraocular High-Density Self-Calibrating Epiretinal Prosthesis

Challenges in circuits for visual prostheses

Contact Info

Product

Resources

About