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This paper summarizes the need for galvanic isolation in SpaceWire networks and reviews the limitations of current isolation solutions; the paper also proposes a new Isolated SpaceWire Receiver device based on radiation-hardened Silicon-on-Sapphire (SoS) technology and demonstrates the benefits of primarily isolating only the receiver lines of an SpW port. As a stepping-stone to the proposed device,...
In this paper we describe a dual-channel, monolithic, capacitive digital isolator on 0.5μm SOS, with a measured single-channel maximum speed of 640Mbps at 3.3V supply -more than 2X better than all previously reported commercial and academic literature. We report 1.8V-compatible operation for the first time, achieving a top speed of 260Mbps; which exceeds the 3.3V performance of all previously reported...
We report low loss silicon-on-sapphire nanowires for applications to mid infrared optics. We achieve propagation losses of < 1dB/cm at λ=1550nm and < 2dB/cm at λ = 2.08 μm and λ = 5.18 μm, the latter representing a factor of 2 reduction in loss over the best previous results.
We report low loss silicon-on-sapphire nanowires for applications to mid infrared optics. We achieve propagation losses of < 1dB/cm at λ=1550nm, < 1.5dB/cm at λ=2080nm and < 2dB/cm at λ = 5.08 μm.
We present novel circuits for high-voltage digital level shifting with zero static power consumption. The conventional topology is analysed, showing the strong dependence of speed and dynamic power on circuit area. Novel techniques are shown to circumvent this and speed up the operation of the conventional level-shifter architecture by a factor of 5-10 typically and 30-190 in the worst case. In addition,...
We report low loss silicon-on-sapphire nanowires for applications to mid infrared optics. We achieve propagation losses of < 1dB/cm at λ=1550nm and < 2dB/cm at λ = 5.08 μm.
The international radio-astronomy community is proposing to build a telescope of unprecedented size in order to allow observation of the farthest reaches of space. This telescope is known as the Square Kilometre Array (SKA), and will be built in one of two southern-hemisphere candidate locations; with the core located in either the West Australian desert, or the Northern Cape region of South Africa...
This paper presents the design and implementation of a low power low phase noise Voltage Controlled Oscillator (VCO) using 0.25-micron Silicon-on-Sapphire (SOS) technology for low jitter low phase noise applications. The VCO comprised of a cross-coupled complementary LC core generating 3.6GHz output and a fully optimised Injection Locked Frequency Divider (ILFD) circuit generating the divide-by-two...
We report low loss silicon-on-sapphire nanowires for potential applications to mid infrared optics. We achieve propagation losses < 1dB/cm in the 1550nm wavelength range and show these devices have potential out to 6 μm.
In this paper we describe a novel system concept and circuit implementation for detecting DC current leaking into tissue from implantable stimulators due to a fault. Such detection is critical as DC current passing into tissue from an electronic implant can cause permanent harm to the implant recipient. The proposed system detects any unintended DC current leaking into tissue regardless of the underlying...
In this paper, we discuss system architectures, design challenges and circuit implementation principles for intraocular epiretinal neuro-stimulators to be used as part of vision prostheses in partially restoring vision to the blind. Our unique hexagonal electrode placement allows focused simultaneous stimulation which allow the electrode count to scale. A new dual-channel transcutaneous inductive...
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