Source-follower circuit for CCD image sensor

Details Source-follower circuit for CCD image sensor Source-follower circuit for CCD image sensor

1992-10-07

1993-12-28

Sikes, William L.

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

Charge transfer device

Particular input or output means

377 57, 377 59, G11L 1928

Patent

active

052746879

ABSTRACT:
The present invention is directed to an output circuit for a charge transfer device which can reduce a coupling voltage of a floating diffusion type charge detecting section and in which a DC fluctuation of an output from a source-follower stage can be suppressed. A dummy floating diffusion region (FD2) is provided and an output thereof is converted by and derived from a bias generator circuit (7) of a source-follower configuration as a positive phase output. This positive phase output is supplied to a load MOS transistor (Q.sub.2) of a source-follower circuit (5) as a bias voltage and also fed back to the load MOS transistor (Q.sub.6) of the bias generator circuit (7) as a gate voltage.

REFERENCES:
patent: 5140623 (1992-08-01), Imai et al.
patent: 5172399 (1992-12-01), Hirose
patent: 5210777 (1993-05-01), Narabu et al.

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