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This paper presents the design of a zero-voltage-ripple (ZVR) buck dc-dc converter. The circuit uses an autotransformer for ripple cancellation in the output voltage. The principle of operation is discussed in brief. The relationship between the currents through the magnetizing inductance and the auto-transformer windings is developed. The auxiliary inductance for ripple cancellation in series with...
A Li-ion battery charger with dual input source capability and high efficiency is proposed in this work. An internal source determination circuit could choose the sufficient energy source for charging system. Also, a new approach of smooth transition to avoid oscillation between charging mode switching is used through current-mode-like smooth transition circuit. Pulse frequency modulation with adaptive...
A CMOS integrated frequency domain near infrared spectroscopy (fdNIRS) and transcranial direct current stimulation (tDCS) is designed for simultaneous brain stimulation and monitoring. The combination of optical sensing and electrical stimulation solves the incompatibility between EEG and tDCS in both time and spatial domains. A real-time closed-loop brain stimulation can be realized for neurological...
This paper investigates the near-breakdown spectral responsivity of perimeter-gated single-photon avalanche diodes (SPADs). We report, for the first time, the effects of perimeter gating on spectral responsivity. Further, we describe a detailed experimental procedure for measuring spectral response. Our investigation reveals that perimeter gating strongly influences spectral responsivity by broadening...
The current work proposes a method and circuitry for a lightning strike detection system with current and vibration detecting features. A Rogowski coil is used for current detection, which can be placed around a conductor where the lightning current is expected to flow. The method also provides means of ascertaining which tower is closest during the moment of the strike through use of a dual-axis...
Electrochemical Impedance Spectroscopy is widely popular in the medical field where it is often referred to as bioelectrical impedance analysis (BIA) used to analyze biological materials as well as characterization of body fluids. It is a complex technique requiring expensive equipment that is also large making it difficult to integrate into small form-factor systems that are hand-held, wearable and...
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