Parameter-setting approach to obtain high performance CTD transversal filters from devices with significant CTI and FPN

摘要

A charge-transfer-device (CTD) transversal filter which makes use of tap-weight-adjustment circuitry for removing effects of charge- transfer inefficiency (CTI) and fixed-pattern noise (FPN). The tap weights are adjusted by measuring the response of the CTD-transversal filter to an isolated pulse input and to a zero-frequency input. The results of the measurements and reference-filter coefficients are used by the tap-weight- adjustment circuitry in order to set tap weights for the CTD-transversal filter. The tap-weight-adjustment circuitry allows the frequency response of the CTD transversal filter to be accurately tailored even though the CTD filter suffers imperfections due to CTI and FPN.