Patent US 4,134,028

Each time a charge signal is shifted, it suffers a small transfer loss. In the charge transfer systems of interest here, that transfer loss charge combines with previous transfer loss charges to form a transfer loss sum charge packet which propagates behind the charge signal. In the present system each charge signal is restored to substantially its initial level, by combining the transfer loss sum charge packet for that charge signal with that charge signal once each n charge transfers, where n is a relatively large number such as 50 or more.