Browsing by Author "Wu Chung-Yu"

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Dual positive-feedbacks voltage controlled oscillator
(2012-09-11)
Huang Zue-Der
;
Wu Chung-Yu
A dual positive-feedbacks voltage controlled oscillator includes an oscillation circuit and a cross coupled pair circuit. The oscillation circuit includes a first transistor, a second transistor, an inductor and a plurality of capacitors. The gates of the first and second transistors are opposite to each other and coupled to two points of the inductor. The inductor and the capacitors are formed as a LC tank. The cross coupled pair circuit includes a third transistor and a fourth transistor. The gates of the third and fourth transistors are cross coupled to two points of the inductor. Thereby, the gate of the third transistor is coupled to the gate of the second transistor; the gate of the fourth transistor is coupled to the gate of the first transistor; the drain of the third transistor is coupled to the source of the first transistor; and the drain of the fourth transistor is coupled to the source of the second transistor.
OPTICAL AID AND RETINAL IMPLANT DEVICE THEREOF
(2015-11-19)
Wu Chung-Yu
;
Lin Po-Kang
;
Chiao Chuan-Chin
;
Pan Jui-Wen
An optical aid comprises a projecting device and a retinal implant device. The projecting device includes an image projector for outputting a projected image and a light generator for emitting an auxiliary light that differs in wavelength from the projected image. The retinal implant device includes an optical-to-electrical converter and an image sensor. The optical-to-electrical converter converts the auxiliary light received thereby into electricity for powering the image sensor. The image sensor is disposed in such a way that the auxiliary light is not received thereby, and generates an electrical stimulus signal associated with the projected image.
Voltage-controlled oscillator
(2011-12-06)
Chen Wei-Zen
;
Wu Chung-Yu
;
Yu Chi-Yao
A voltage-controlled oscillator comprises a variable inductor, a negative impedance circuit, an operating voltage source and a ground point. The variable inductor comprises a transformer and a transistor switch, the transformer comprising a primary side coil and a secondary side coil, the primary side coil comprising a first coil and a second coil, and the secondary side coil comprising a third coil and a fourth coil. The transistor switch is connected in parallel with the primary side coil to adjust an inductance value of the variable inductor based on a gate voltage. The negative impedance circuit is connected in parallel with the secondary side coil to compensate the power consumption of the voltage-controlled oscillator during oscillation. The operating voltage source is electrically connected between the third coil and the fourth coil, and the ground point is electrically connected between the first coil and the second coil.