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Accurate assessment of carotid artery disease by measuring blood flow, plaque deformation and pulse wave velocity using ultrasound imaging requires 3D information. Additionally, the volume rates should be high enough (> 1 kHz) to capture the full range of these fast transient phenomena. For this purpose, we have built a programmable, tileable matrix array that is capable of providing 3D ultrasound...
Accurate assessment of carotid artery disease by measuring blood flow, plaque deformation and pulse wave velocity using ultrasound (US) imaging requires 3D information. Additionally, the volume rates should be high enough (> 1 kHz) to capture the full range of these fast transient phenomena. For this purpose, we have built a programmable, tileable matrix array that is capable of providing 3D US...
An off-line light-emitting diode (LED) driver circuit that adopts a modified boost converter architecture with hysteric current control for power factor correction (PFC) is described. It removes a bulky electrolytic capacitor, improving the lifetime and enabling direct regulation of the LED current. To reduce the size and manufacturing cost of the LED modules, the driver circuit is designed as a custom...
A light-emitting diode (LED) driver circuit that can operate off of an AC power supply without any reactive elements is described. The proposed circuit consists of resistive components and switches only, making it suitable for a single-chip integrated-circuit (IC) driver solution to realize a low-cost LED replacement for incandescent light bulbs. The driver circuit employs multiple strings of LEDs...
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