Figure 1
(a) Single readout port CCD showing horizontal clocking in the parallel registers and vertical clocking in the serial register. (b) A two-port readout architecture. Charge packets are shifted simultaneously, but in opposite directions from the parallel registers, into two serial registers. With a given read rate, this reduces full frame readout time by a factor of two. (c) A four-port readout architecture. Note that four full sets of analog and analog-to-digital converters must be used in parallel, significantly increasing the cost of the support electronics. |