1
Alexander I Krymski, Kwang Bo Cho: Look ahead rolling shutter system in CMOS sensors. Micro Technology, Dickstein Shapiro Morin & Oshinsky, October 26, 2004: US06809766 (77 worldwide citation)

A shutter system for a pixel array is disclosed. The system includes a read shift register, first and second reset shift registers, and a plurality of logic gates. The read shift register is configured to sequentially count rows of the pixel array from top to bottom, such that the read shift registe ...


2
Chiajen M Lee, Kwang Bo Cho: Method and apparatus for calibrating parallel readout paths in imagers. Aptina Imaging Corporation, Dickstein Shapiro, November 18, 2008: US07453054 (40 worldwide citation)

An imaging device with readout chain circuitry that uses multiple analog-to-digital converters and amplifiers, which are similarly calibrated using a stitching technique, to readout each color of a column and mitigate the possibility of a boundary effect.


3
Kwang Bo Cho: Low glitch current steering digital to analog converter and method. Micron Technology, Dorsey & Whitney, May 25, 2004: US06741195 (24 worldwide citation)

A current steered digital to analog converter (DAC) circuit includes a reference input transistor, a plurality of current steered current sources each coupled to the reference input transistor and configured to provide a combined current source output and an output current mirror having an input cou ...


4
Kwang Bo Cho, Igor Subbotin, Michael Kaplinsky, Sandor L Barna, Gary E Slayton: High intrascene dynamic range NTSC and PAL imager. Micron Technology, Dickstein Shapiro, June 3, 2008: US07382407 (22 worldwide citation)

The invention provides a new method and apparatus for NTSC and PAL image sensors which employs fusion of adjacent row pixel charge samples to generate image data for a row. A variety of fusion schemes are possible for fusing the pixel signals from the adjacent rows. The rows of pixels are scanned so ...


5
Sandor L Barna, Guiseppe Rossi, Kwang Bo Cho, Roger Panicacci: CMOS image sensor with a low-power architecture. Micron Technology, Dickstein Shapiro Morin & Oshinsky, June 27, 2006: US07068319 (18 worldwide citation)

A system of reducing power consumption in and active pixels sensor. The sensor is broken into different blocks, and each of the blocks is individually optimized. The optimization may include minimizing the parasitic capacitance on the readout bus, turning off biases when not in use, and operating in ...


6
Alexander I Krymski, Kwang Bo Cho: Look ahead rolling shutter system in CMOS sensors. Aptina Imaging Corporation, Dickstein Shapiro, August 11, 2009: US07573516 (15 worldwide citation)

A shutter system for a pixel array is disclosed. The system includes a read shift register, first and second reset shift registers, and a plurality of logic gates. The read shift register is configured to sequentially count rows of the pixel array from top to bottom, such that the read shift registe ...


7
Taehee Cho, Sandor L Barna, Andrew M Lever, Kwang Bo Cho, Chiajen Lee: Sharing operational amplifier between two stages of pipelined ADC and/or two channels of signal processing circuitry. Micron Technology, Dickstein Shapiro, December 12, 2006: US07148833 (12 worldwide citation)

A mechanism for discharging parasitic capacitance at an input of an operational amplifier, which is shared between two stages of a pipelined analog-to-digital converter and/or two channels of signal processing circuitry, before the amplifier configuration of the stages/channels is switched. The disc ...


8
Taehee Cho, Sandor L Barna, Andrew M Lever, Kwang Bo Cho, Chiajen Lee: Sharing operational amplifier between two stages of pipelined ADC and/or two channels of signal processing circuitry. Micron Technology, Dickstein Shapiro, December 30, 2008: US07471228 (11 worldwide citation)

A mechanism for discharging parasitic capacitance at an input of an operational amplifier, which is shared between two stages of a pipelined analog-to-digital converter and/or two channels of signal processing circuitry, before the amplifier configuration of the stages/channels is switched. The disc ...


9
Kwang Bo Cho: Pixel optimization for color. Micron Technology, Dickstein Shapiro, December 26, 2006: US07154546 (9 worldwide citation)

A macro pixel is provided. The macro pixel includes at least two color pixel elements. Each color pixel element includes a photoreceptor that in response to receiving light, generates an output signal that is indicative of the quantity of light photons of a color are received. Each of the color pixe ...


10
Kwang Bo Cho, Michael Kaplinsky, Sandor L Barna, Zeynep Toros, Igor Subbotin: Imaging apparatus providing black level compensation of a successive approximation A/D converter. Micron Technology, Dickstein Shapiro, January 8, 2008: US07317480 (8 worldwide citation)

Image sensor with a successive approximation A/D converter that automatically compensates for black level and provides a signal indicative of the difference between the reset level and the signal level. Black level for each of a plurality of color pixels may be obtained. This may be obtained from, f ...