Method and system for implementing h-banding cancellation in an image sensor

An image sensor comprising:

• a pixel array for acquiring image data, wherein the pixel array includes a plurality of pixels to generate pixel data signals, respectively;
• readout circuitry coupled to the pixel array, wherein the readout circuitry includes:
• a ramp generator to generate a ramp signal, and
• an analog-to-digital conversion (ADC) circuitry that converts the pixel data signals from analog to digital to obtain ADC outputs, wherein the ADC circuitry includes:
• comparator circuitry that includes a plurality of comparators, each of the comparators compares one of the pixel data signals to a ramp signal and outputs a comparator output signal, wherein the plurality of comparators are stacked to form a plurality of top comparators disposed on a plurality of bottom comparators, wherein each of the plurality of comparators are coupled to a plurality of inverters to generate two comparator output signals, the two comparator output signals include a positive comparator output signal and a negative comparator output signal, and
• logic circuitry to control the readout circuitry.

A method of implementing H-banding cancellation in an image sensor comprising:

• capturing, by a pixel array, image data, wherein the pixel array includes a plurality of pixels to generate pixel data signals, respectively;
• acquiring, by ADC circuitry coupled to the pixel array, the pixel data signals, wherein the ADC circuitry includes a comparator circuitry and a latch;
• comparing, by a plurality of comparators included in the comparator circuitry, the pixel data signals, respectively, to a ramp signal received from a ramp generator to generate comparator output signals, wherein adjacent comparators output signals are opposite in polarity, wherein the plurality of comparators are arranged in a stack to form a plurality of top comparators disposed on a plurality of bottom comparators;
• and
• latching, by the latch, an ADC counter based on the comparator output signals to generate an ADC output.

A method of implementing H-banding cancellation in an image sensor comprising:

• capturing, by a pixel array, image data, wherein the pixel array includes a plurality of pixels to generate pixel data signals, respectively;
• acquiring, by ADC circuitry coupled to the pixel array, the pixel data signals, wherein the ADC circuitry includes a comparator circuitry and a latch;
• comparing, by a plurality of comparators included in the comparator circuitry, the pixel data signals, respectively, to a ramp signal received from a ramp generator to generate comparator output signals, wherein the plurality of comparators are stacked, wherein each of the plurality of comparators are coupled to a plurality of inverters to generate two comparator output signals, the two comparator output signals include a positive comparator output signal and a negative comparator output signal;
• latching by a latch an ADC counter based on the comparator output signals to generate an ADC output;
• receiving, by each multiplexer, the two comparator output signals from each of the comparators, respectively;
• and
• providing, by each multiplexer, one of the two comparator output signals as a multiplexer output, respectively.