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We present a neural stimulator chip with an output stage (electrode driving circuit) that is fail-safe under single-fault conditions without the need for off-chip blocking-capacitors. To miniaturize the stimulator output stage two novel techniques are introduced. The first technique is a new current generator circuit reducing to a single step the(More)
—Two prior-art transconductance amplifier-based rail-to-rail class-AB analog buffers are examined. Their analysis reveals that the output current drive capability for large input voltages is restricted. To mitigate this drawback, a relatively simple slew-rate enhancement scheme is proposed. The new scheme allows the buffer's speed to be increased by over(More)
A CMOS analog buffer with high output drivability is presented. The buffer combines class-AB operation with rail-to-rail signal swing. A new adaptive biasing scheme is proposed with low complexity, thereby allowing the construction of a very compact, low-power analog voltage buffer with wide bandwidth and high slew rate. Simulated results using a 0.35-mum(More)
Information extracted from whole-nerve electroneurograms, recorded using electrode cuffs, can provide signals to neuroprostheses. However, the amount of information that can be extracted from a single tripole is limited. This communication demonstrates how previously unavailable information about the direction of action potential propagation and velocity(More)
− This paper presents an overview of low power, low complexity and high speed CMOS synchronous replicating current comparators (RCC) for use in any analog and digital signal processors. Although 2-input synchronous RCCs have been reported in the literature, multiple input versions tend to be power hungry and usually suffer from accumulated errors. On the(More)
Two integrated nerve stimulator circuits are described. Both generate passively charge-balanced biphasic stimulating pulses of 1 to 16 mA with 10-¿s to 1-ms widths from 6- to 24-V supplies for implanted book electrodes. In both circuits, the electrodes are floating during the passive discharge anywhere within the range of the power rails, which may be up to(More)
Following the first imported case in a tourist in Cyprus on 2 June 2009, the influenza A(H1N1)v virus has spread on the island affecting mainly young adults and children. We describe here the first 45 cases in children. Fever, cough, rhinorrhoea and sore throat were the most common symptoms of infection. Half of the children had fever for one day or only(More)