Charge amplifier for MOS imaging array and method of making same

Details Charge amplifier for MOS imaging array and method of making same Charge amplifier for MOS imaging array and method of making same

1996-03-18

1998-05-12

Faile, Andrew

Amplifiers

With periodic switching input-output

330 51, 348300, 348302, H03F 102

Patent

active

057511896

ABSTRACT:
A charge amplifier with DC offset canceling for use in a pixel element of an MOS image sensor is disclosed. The charge amplifier can be manufactured using a standard CMOS single polycrystalline process, making it much more cost effective than prior art designs. The charge amplifier includes an operational amplifier, a source capacitor, a series capacitor, and a feedback capacitor. The source capacitor holds the input signal. The output of the operational amplifier provides the output signal. Switches control the routing of the signal flow from the source capacitor, the series capacitor, and the feedback capacitor.

REFERENCES:
patent: 5233180 (1993-08-01), Tsuruta et al.
patent: 5345266 (1994-09-01), Denyer
patent: 5448056 (1995-09-01), Tsuruta
patent: 5521555 (1996-05-01), Tazartes et al.
Kawashima, H. et al., A 1/4 inch format 250K pixel amplified MOS image sensor using CMOS process, IEDM, pp. 575-578, 1993.
Ozaki, T. et al., A low-noise line-amplified MOS imaging devices, IEEE, pp. 969-975, 1991.

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