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This paper presents a two-electrode cardiac rhythm-monitoring amplifier that also senses the impedance between the same electrodes. Online monitoring of the body and electrodes impedances during high-voltage (HV) energy delivery or defibrillating, is needed to precisely estimate the amount of charge being delivered to the cardiac muscle. By adjusting the HV stimulus waveform, the amount of charge...
A 4-channel wireless and battery-less neurostimulator with impedance-tracking power-adaptive voltage compliance is presented. The device houses a 10 mm2 0.35µm HV-CMOS SoC (system on a chip) that performs current-mode arbitrary-waveform stimulation with voltage compliance of up to 20 V. An on-chip mixed-signal controller together with a 3-bit charge-pump maintain supply voltage at its minimum required...
Feto- maternal monitoring is essential to assess fetal health throughout the pregnancy and during labor. Fetal ECG, uterine contraction, fetal movements, growth of the fetus, amniotic fluid volume and position of placenta are some of the important parameters to assess fetus health. Cardiotocogram (CTG) and Ultrasound are widely used for monitoring feto-maternal physiological and morphological parameters...
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