Abstract: A device for correcting charge-transfer inefficiency-induced distortion in charge-transfer-device analog shift registers. The shift register successively samples a data line of interest, a voltage reference source and a null input. A variable time-delayed, synchronous inverter provides a-c coupling of the register so as to avoid bias content effects, and cancels the "tail" or terminal data smear induced by the charge-coupled device, the delay or phase of which inverter is adjusted during response of the charge-coupled device to a sampled null input. Additional compensation of the shift register output is also provided for gain changes thereof.