Crosstalk cancellation in a multi-color CCD signal processor

摘要

A method and apparatus are provided for cancelling crosstalk noise arising on signal lines output from an image sensor. More specifically, the crosstalk noise is cancelled by a current mirror (70a, 70b, 70c) that is coupled to the signal line. The current mirror adjusts the voltage level on the signal line by drawing a current therefrom that is proportional to the amount and polarity of the crosstalk noise. The amount of crosstalk noise is determined by an amount of coupling within an A/D converter (19) coupled to the signal lines. The current mirrors can further adjust the voltage on the signal line by drawing a current therefrom that is proportional to crosstalk arising due to a voltage level on another signal line. Such a current mirror allows pixel data to be conveyed to the A/D converter, via the signal lines, without imparting aberrations due to crosstalk noise.