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In this paper, a high-voltage integrated bipolar pulser for medical ultrasound scanner applications is proposed. The pulser employs high-speed level shifters and a high-voltage push-pull output stage that can produce 100 Vpp (±50V) output pulses with rising and falling times of 10.6 ns and 10.5 ns, respectively, under a 1-KΩ resistance parallel with a 100-pF capacitance load. The transmitted signal...
This paper proposes a 12-bit DAC using switched-current technique and segmented topology, which includes a 9-bit thermometer code and a 3-bit binary code and a 125-MHz fully differential current- mode line driver for a better noise immunity at high frequencies. High bandwidth and power reduction are the major factors of designing high-speed digital transmitter for over a decade. The main building...
This study proposed the use of an innovative shielded capacitive sensing electrode in noncontact electrocardiograms (ECG) with high noise immunity. Capacitive ECGs are sensitive to external noise and interference such as mains power and environmental changes. Therefore, a shielded capacitive electrode designed with capacitance feedback was proposed to prevent such interference.
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