Circuitry and methods for mitigating imbalance in image sensors with multiple readout paths

A method of operating imaging circuitry comprising:

• receiving signals from a pixel array with first readout circuits disposed at a first location relative to the pixel array;
• receiving signals from the pixel array with second readout circuits disposed at a second location different than the first location relative to the pixel array;
• receiving a calibration voltage with a first calibration readout circuit disposed by the first readout circuits;
• receiving the calibration voltage with a second calibration readout circuit disposed by the second readout circuits;
• and
• outputting the calibration voltage, with a calibration voltage generator, onto a column line that is coupled to the first and second calibration readout circuits, wherein the calibration voltage generator is disposed at a midpoint of the column line between the first and second calibration readout circuits.

A method of operating imaging circuitry comprising:

• receiving signals from a pixel array with first readout circuits disposed at a first location relative to the pixel array;
• receiving signals from the pixel array with second readout circuits disposed at a second location different than the first location relative to the pixel array;
• receiving a calibration voltage with a first calibration readout circuit disposed by the first readout circuits;
• receiving the calibration voltage with a second calibration readout circuit disposed by the second readout circuits;
• and
• generating an error signal based on signals output from the first and second calibration readout circuits.