online engineering degree/engineering degree online/online engineering courses/engineering technology online/engineering courses online/engineering technician degree online/online engineering technology/electronic engineering online
Patent application US20120091323 by Shoji Kawahito proposes to speed-up the column voltage sampling onto a big capacitor. The idea is to add small capacitor sampler 17 that samples the column first, then accelerates charging of the main sampling cap C1i. It's quite self-explanatory based on the schematics and the timing diagram below (Block 11 is a pixel driving column Vcol):
There are few other similar ideas, like pre-charging the large C1i capacitor through a unity-gain buffer and then completing the final charge stage directly from column. One can add a little bit high pass filtering in the buffer to compensate for low-pass nature of the pixel+column cap path.
On the other hand, in Kawahito's idea one can add a small time delay or a phase shift in the trans-impedance amplifier 25 on the figure above to achieve a kind of inductive impedance in the column load and get some speed up from it.
online civil engineering technology degree/online electrical engineering degree/online electrical engineering degree abet/online electrical engineering technology degree/online engineering courses/online engineering degree/online engineering technology/online engineering technology degree/online engineering technology degree programs/online mechanical engineering technology degree
