Method of making a contactless capacitor-coupled bipolar active

Details Method of making a contactless capacitor-coupled bipolar active Method of making a contactless capacitor-coupled bipolar active

1997-09-02

1998-07-07

Dutton, Brian

Semiconductor device manufacturing: process

Making device or circuit responsive to nonelectrical signal

Responsive to electromagnetic radiation

438 79, H01L 2100

Patent

active

057767955

ABSTRACT:
A contactless capacitor coupled bipolar phototransistor having an integrated electronic shutter for reducing the overflow and blooming problems associated with the imaging of strong images. Overflow control and an anti-blooming mechanism are obtained by use of a second emitter (the "shutter") which is used to remove excess image generated charge. This prevents the base-emitter junction potential from becoming forward biased during image integration when the phototransistor is exposed to a strong image. The shutter is biased slightly lower than the first emitter of the phototransistor so that the base-shutter junction is forward biased sooner than the base-emitter junction when the imaging element is exposed to a strong image. The overflow current of the generated holes is then drained to the shutter, rather than into the emitter where it would produce noise on the column sense line.

REFERENCES:
patent: 5260592 (1993-11-01), Mead et al.
patent: 5289023 (1994-02-01), Mead

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