detected or touch control not detected each state may be represented by a digital 1 or 0 value in other implementations a range of values for v out may be measured for each pixel and provided as multi bit digital data there may be one or more charge removal circuits 520 for a touch sensitive capacitive matrix in some embodiments one charge removal circuit 520 may be used to compensate charge for a plurality of pixels e g in implementations where the plurality of pixels are scanned serially in some embodiments each pixel row of pixels or column of pixels may be associated with a respective charge removal circuit 520 e g in implementations where a plurality of pixels are scanned in parallel various embodiments of charge removal circuitry 520 are shown in fig6 a 6c according to some embodiments charge removal circuitry 520 may comprise a compensating capacitor c x configured to be connected to a compensating voltage v x as shown in fig6 a either one or both of the compensating capacitor c x and compensating voltage v x may be programmable e g set from memory by a controller not shown the values for c x and or v x may be determined for each pixel during a calibration phase for the touch sensitive capacitive matrix and subsequently applied during measurement phases in some implementations v x may be fixed and c x programmable in such an.