Abstract: The input signal to a CCD register is sampled many times during one period of the multiple phase voltages employed to drive the CCD. The samples are translated to small charge packets which are added to one another during the one period to produce a sum charge packet which subsequently is propagated down the register. The higher frequency components, including noise, which are present in the input signal largely cancel during the charge addition process.

Abstract: A voltage variable tuning capacitor structure is disclosed. A pair of metal-insulator-semiconductor (MIS) capacitors are fabricated in a body of semiconductor material in back-to-back configuration. The back-to-back configuration reduces the effect of intermodulation distortion. The device has a relatively high quality factor, Q, because of a relatively low transverse resistance which is provided by a doped region between the pair of capacitors. The device may be used for the electronic tuning of integrated RF receivers for television, VHF, UHF, AM or FM tuners.