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The current accuracy and power efficiency of a boost white light-emitting-diode (WLED) driver are usually design tradeoffs since the power efficiency is inversely proportional to the reference voltage, whereas the current accuracy is proportional to the reference voltage. Traditionally, a boost WLED driver with high current accuracy and high power efficiency demand a large chip area because mismatch...
Power efficiency is a very important issue for portable electronic devices since it determines the battery life. The backlight module usually accounts for the major part of power dissipation in a portable device. Thus, to extend the operation time of a portable device, a high efficiency backlight module should be employed. White light-emitting diodes (WLEDs) have replaced cold cathode fluorescent...
This paper proposes a method to calibrate and position surgical instruments using stereo camera, discusses the calibration error and its propagation when the instrument is positioned. A planar marker composed by X corners is attached to the instrument, and a reference frame is established on the marker. The structural parameter of instrument is calibrated on clinical site by rotating the instrument...
In this paper, a low-cost ADC output response analyzer (ORA) circuit for built-in self-test (BIST) application is proposed. The sine-wave histogram testing method and the basic coordinate rotation digital computer (CORDIC) technique are used to design the proposed ADC ORA circuit. The ADC's static and dynamic parameters can both be obtained using the proposed circuit. The basic CORDIC based ADC ORA...
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