Abstract:
PURPOSE: An analog-to-digital converter using correlated double sampling and an analog-to-digital converting method using the same are provided to reduce switching noise and power consumption by satisfying the number of bits to count the dissemination of reset signals. CONSTITUTION: A CMOS image sensor comprises a pixel array(1), a comparator(2), a CDS processing unit(3), an N-bit counter(6), and a latch unit(7). The CMOS image sensor comprises a vertical scanning circuit(8), a horizontal scan circuit(9), a lamp signal generator(10), an output circuit(11), and a control signal generating unit(12). The CDS processing unit comprises a CDS counter(4) and an and-logic(5) The control signal generating unit creates signals to control a vertical scanning circuit, a horizontal scanning circuit, a CDS processing unit, an N bit counter.
Abstract:
PURPOSE: An analog to digital converter (ADC) for outputting a digitized sample signal after comparing a sample signal and a ramp signal and an image sensing apparatus applying the same are provided to increase an analog to digital (A/D) conversion speed two times faster than when exclusively using an existing up-ramp, thereby providing a high-definition image without delay. CONSTITUTION: A pixel (110) outputs an analog pixel value. A sample and hold (S/H) amplifier (120) generates a sample signal by performing a sample-and-hold operation of the analog pixel value outputted from the pixel. An ADC (130) digitizes the sample signal generated in the S/H amplifier after comparing the sample signal and multiple ramp signals. [Reference numerals] (110) Pixel; (131) Comparator-1; (132) Comparator-2; (133) Memory; (135) Compensation converter; (141) Up-lamp signal generator; (142) Down-lamp signal generator; (150) Counter