Browsing by Author "Wu Chun-Yu"

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Area-efficiency delta modulator for quantizing an analog signal
(2014-09-23)
Wu Chun-Yu
;
Lyu Yuan-Fu
The invention comprises sample-and-hold circuit and digital-to-analog converter into a differentially operational unit. In analog-to-digital conversion unit, on the premise of fixed or non-fixed quantization error, analog-to-digital converter dynamically adjusts number of bits solved or size of quantized step according to the magnitude of differential voltage between sampled input signal and previously quantized input signal, thus this invention can reduce the non-necessary power consumption from redundant code and overload of input signal. Differentially operational unit and analog-to-digital unit share the same capacitor array which has binary-weighted arrangement to reduce circuit complexity and area.
Artificial retinal system and retinal implant chip thereof
(2014-05-27)
Wu Chun-Yu
;
Lin Po-Kang
;
Chiao Chuan-Chin
;
Pan Jui-Wen
;
Yang Wen-Chia
An artificial retinal system includes an external optical device having an image generator and a background light generator, and a retinal implant chip having a solar cell and a stimulus generator. The stimulus generator is disposed to receive a target image projected by the image generator and a background light provided by the background light generator, and receives the electrical power from the solar cell. The stimulus generator includes an image sensing stimulator operable to convert the target image into electrical stimuli, and a contrast enhancer for reducing effect of the background light on the electrical stimuli.