A general model for the transfer function of a multiphase CTD delay line is presented in the z-domain. It covers the widely used single-phase transfer function. The new model has been applied for CTDs with asymmetrical potential wells. If poor charge transfer efficiencies are considered, the new model offers a significant correction to the single phase model.
Wallinga, H. (1979). A general model for the frequency response of multiphase charge transfer delay lines. IEEE journal of solid-state circuits, 14(3), 653-655. https://doi.org/10.1109/JSSC.1979.1051233