Transient analysis of electrical and linear charge preset on the input stage of surface CCD's

Transient numerical analysis of electrical signal injection into the surface charge-coupled device (CCD) is given regarding the potential equilibration method. The analysis is composed of the charging and discharging processes of signal charges, characterized by time intervals T
C
and T
D
of the respective input pulses. A concept of "setting time T
S
" explains how the mode of injection converts from the potential equilibration to dynamic injection, and determines an optimum T
C
. A concept of "residual effect of excess charges" is discussed in relation to sampling effect. The procedure to determine an optimum T
D
is also proposed. The optimum input timing is divided into two instances in accordance with the degree of the gate length
L; L > < 5-8
µm. For the instances (
L > 5-8
µm) the timing condition is further split into two cases, depending on the biased potential difference
V_{G1}-V_{BL}
. The above conclusions can be applied to setting input pulses and the structure of CCD inputs designed for analog signal processing.