A two-phase GaAs cermet gate charge-coupled device

The design, fabrication, and operation of a 64-pixel, two-phase GaAs cermet gate charge-coupled device (CMCCD) is described. A castellated channel geometry provides the built-in electric field for directing the flow of signal charge within the CMCCD channel. A two-dimensional computer model for the electrostatic potential within a single pixel of the CMCCD is used to verify the presence of the built-in electric field and is used to show the possibility of the existence of energy troughs under the cermet gates. Energy troughs within the CMCCD are undesirable, as they increase the dispersion of signal charge through the device. It is shown that the energy troughs are overcome by increasing the clock voltage amplitude. A 64-pixel, two-phase CMCCD demonstrated a charge-transfer efficiency of 0.996 when operated at 46 MHz.<
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