Charge-coupled device having an improved input stage

Details Charge-coupled device having an improved input stage Charge-coupled device having an improved input stage

1987-03-31

1988-09-13

Munson, Gene M.

Electrical pulse counters, pulse dividers, or shift registers: c

Charge transfer device

Particular input or output means

357 24, G11C 1928, H01L 2978

Patent

active

047714450

ABSTRACT:
The invention relates to a CCD having a so-called diode cut-off input, in which the input diode is applied to a reference voltage and the input signal is supplied to the input gate located in front of the first clock electrode. More particularly, if the electrodes are composed of a transfer part and a storage part with an incorporated potential difference, it is possible that, when charge is transported from the input gate to the first clock electrode, a large amount of charge is left behind. In order to avoid this and/or to be able to enlarge the dynamic range of the input signal, a MOST switch controlled by the same clock voltage as the first clock electrode is arranged between the input gate and a reference voltage, for example ground. This switch becomes conducting when the charge is transferred, as a result of which the potential level below the input gate can be adjusted above the surface potential below the transfer part of the first clock electrode.

REFERENCES:
Wallinga "A Comparison of CCD Analog Input Circuit Characteristics", Int. Conf. Technology and Applications of Charge Coupled Devices, Edinburgh (9/74), pp. 13-21.
Beynon et al., Eds., Charge-Coupled Devices and Their Applications, McGraw-Hill, London (1980), pp. 187-189.

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