Siemens Aktiengesellschaft

Heiner Klar

Hans-Joerg Pfleiderer

Manfred Mauthe

A charge coupled device (CCD) input circuit operates according to the fill and spill principle. An arrangement of a distributor electrode and a barrier electrode, and a drain diode laterally adjacent the electrode row, provide for the separation and removal of an undesirable d.c. component from the a.c. component of the signal. The optimum working point, in contrast with known CCD input circuits, lies at full modulation. The invention provides the system having a high degree of linearity with a high amplification.

Charge coupled device (CCD) input circuit operating according to the

An integrated circuit for transferring complementary charge packets between a first and second charge transfer device has a resettable gate common to both charge transfer devices which serves as a transfer electrode for the first charge transfer device and as an electrode in the input stage of the second charge transfer device. An electrode which is maintained at a constant voltage is disposed in the second charge transfer device between the common electrode and an oppositely doped semiconductor region which is connected to a normally constant voltage which periodically is substantially reduced, thereby flooding the region beneath the common electrode with charge carriers. When the voltage connected to the oppositely doped semiconductor region is returned to a high value, a potential well is created beneath the constant voltage electrode which becomes filled with a first charge packet. Upon the appearance of the charge packet in the first transfer device beneath the common electrode, a voltage drop occurs which results in a corresponding potential drop beneath the common gate in the second charge transfer device resulting in a flow of charge carriers in reverse to the previous flow leaving a charge packet beneath the common gate which is complementary to the charge packet introduced into the first charge transfer device.

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Munich, Germany

Heiner Klar