Abstract: An output electrode of a charge coupled device (CCD) register comprises a conductor which is insulated from the substrate over the major portion of its length and which is connected at one end to a diffusion in the substrate of opposite conductivity type than the substrate. A voltage source capacitively coupled to the output electrode supplies a voltage which varies between two levels. In response to one of these levels, the output electrode assumes a potential such that charge signal may accumulate in the region of the substrate beneath the output electrode and at which the semiconductor junction between the diffusion and the substrate is reversed biased. In response to the transition of the voltage from the one to its other level, the junction becomes forward biased and clamps the output electrode to the substrate potential.

Abstract: Circuit employing complementary field-effect transistors operated in the triode mode. A signal representing the multiplicand is applied to the gate electrode of one transistor and a signal representing the multiplier is applied to the drain electrode of the same transistor. The complement of the multiplier signal is applied to the drain electrode of the other transistor. A current indicative of the product is available at the common connection of the source electrodes.