Floating clock sensor for buffered, independent, non-destructive

Details Floating clock sensor for buffered, independent, non-destructive Floating clock sensor for buffered, independent, non-destructive

1975-10-24

1977-08-09

Ruggiero, Joseph F.

Registers

Transfer mechanism

Traveling pawl

307221D, 340173R, 357 24, G06G 712, H03K 5159

Patent

active

040412989

ABSTRACT:
In a charge transfer device (CTD), such as a charge coupled device (CCD), a gate electrode employed for sensing of the charge packet being transferred, or coupled through the device is clocked during one phase of the four-phase clocking and is permitted to float, i.e., be isolated, during a sensing phase of the four-phase clocking. Since the sensor is a gate electrode rather than a diffusion, it presents no obstruction to the propagation of charge down the channel. Since sensing occurs while the electrode is floating, the sensing or readout function does not have any detrimental effect on the propagation of charge down the channel, i.e., it affords a truly non-destructive readout. During a clocking phase in which charge is isolated under a different gate electrode, an attractive voltage clock pulse is applied to the sensor electrode, rendering it attractive. The sensor electrode is then isolated from the clocking source and, in the appropriate succeeding clocking intervals, the charge advances to the well under the sensor electrode. Sensing of the charge then occurs while the electrode remains in its floating condition. Subsequently, a clock pulse is applied to the sensor electrode rendering it repulsive to advance the charge down the CCD channel. The floating clock sensor electrode of this invention is highly advantageous in any application requiring non-destructive readout; an illustrative configuration for non-destructive parallel output (PO) operation of a CCD shift register is disclosed.

REFERENCES:
patent: 3781574 (1973-12-01), White et al.
patent: 3932775 (1976-01-01), Kosnocky

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