Switching circuit and charge transfer device using same

Details Switching circuit and charge transfer device using same Switching circuit and charge transfer device using same

1996-03-19

1999-05-25

Garber, Wendy

Television

Camera, system and detail

Solid-state image sensor

348241, 348324, H04N 314, H04N 5335

Patent

active

059073578

ABSTRACT:
A switching circuit comprising a means for holding a signal or a DC component thereof, and a switching transistor for driving the holding means, wherein another means is included for shaping the trailing edge to be more obtuse in the fall of a driving pulse applied to a gate of the switching transistor. There is also disclosed a charge transfer device comprising a charge transferrer for transferring a signal charge, a charge-voltage converter for converting the transferred signal charge into a proportional voltage, and a driver for supplying a reset pulse to the charge-voltage converter so as to reset the capacitance thereof to a predetermined potential, wherein another a means is incorporated in the driver for shaping the trailing edge to be more obtuse in the fall of the reset pulse. Since the trailing edge of the reset pulse at the time of turning off the reset is rendered more obtuse, it becomes possible to reduce the coupling portion of the output waveform where the potential of a floating diffusion or a floating gate is varied by the capacitive coupling which is derived from the parasitic capacitance between a reset drain and a reset gate.

REFERENCES:
patent: 4999676 (1991-03-01), Mouri
patent: 5623221 (1997-04-01), Miyake

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