Charge transfer device with reset voltage generating circuit

Details Charge transfer device with reset voltage generating circuit Charge transfer device with reset voltage generating circuit

1988-05-20

1991-02-26

Heyman, John S.

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

Charge transfer device

Particular input or output means

377 58, 357 24, 307530, 307578, H01L 2978, G11C 1928

Patent

active

049966863

ABSTRACT:
In a charge transfer device, a voltage generating cirucit generates a voltage amounting to a potential lower by ".alpha." (.alpha.: a predetermined potential) than a potential formed under a reset gate electrode when stored charges of a floating diffusion region are discharged into a drain region. A voltage step-up circuit steps up a predetermined voltage and supplies the stepped-up voltage as a reset voltage to the drain region. A comparison/control circuit generates an error voltage amounting to a difference between the output voltage of the voltage generating circuit and the stepped-up voltage, and controls the voltage step-up operation by the step-up circuit according to the error voltage. With the structure of the device, the stepped-up voltage from the voltage step-up circuit, which is supplied as a reset voltage to the drain region, is controlled according to the process parameter variations. The result is that the reset voltage well follows up the process parameter variations, the dynamic range of the output signal is always kept wide, and the output signal of good linearity and good S/N performance can be obtained.

REFERENCES:
patent: 4451744 (1984-05-01), Adam
patent: 4482825 (1984-11-01), Nozaki et al.
patent: 4627083 (1986-02-01), Pelgrom et al.
patent: 4636664 (1987-01-01), Craycraft et al.
patent: 4771194 (1988-09-01), Van Zeghbroeck
patent: 4809307 (1989-02-01), Sakaue et al.
patent: 4890307 (1989-12-01), Imai et al.
1971 IEEE International Solid-State Circuits Conference, Digest of Technical Papers, Feb. 17-19, 1971, vol. 14, pp. 162-163, 203, W. F. Kosonocky et al.: "Charge-coupled Digital Circuits."
Japanese Patent Disclosure (KOKAI) No. 59-132668, Imai, Jul. 30, 1984.
Japanese Patent Disclosure (KOKAI) No. 61-216473, Kimata, Sep. 26, 1986.

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