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Architectures of CCD sensors with different degrees of parallel readout. (A) An example of a conventional scientific CCD with four readout ports. Each has a floating-diffusion amplifier (FA) wire-bonded to the external gain amplifier (GA). (B) A possible implementation of a fully column-parallel-readout CCD. (C) Fully column-parallel-readout CCD without floating-diffusion amplifiers, due to the small column pitch.
