We used CCDs for Sine & Cosine Convolvers as part of the Chirped Z Transform based portable handheld Real Time SA developed back ~80. Back then we had a custom CCD process, and these custom CCDs had very large clock capacitances (recall 4 clocks, 2 had large C and 2 had moderate C). These clocks needed to swing >15VPP at a high rate which would produce a very large chip clock driver power dissipation and might be why the early CCD imaging chip based cameras consumed high power (during readout).
Anyway, we developed a clocking scheme called "Reactive Clocking" which exchanged the capacitive clock energy stored in the chip clock capacitance with the power supply, similar to a boost regulator, which saved ~95% of the power of a conventional clock driver (we should have patented this but didn't, and ~ decade later NASA did, altho for a different application!!). Without the Reactive Clock our handheld SA would require a couple deep discharge DieHard Lead Acid Truck batteries
Best,