Read-out photodiodes using sigma-delta oversampled analog-to-dig

Details Read-out photodiodes using sigma-delta oversampled analog-to-dig Read-out photodiodes using sigma-delta oversampled analog-to-dig

1990-10-01

1992-08-25

Logan, Sharon D.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

H03M 302

Patent

active

051422867

ABSTRACT:
Sigma-delta analog-to-digital conversion is used in sensing apparatus that generates a digital signal descriptive of light energy received by a photosensor, such as one of a plurality of photosensors that together receive various elements of a radiant-energy image. A preamplifier generates an analog output signal responsive to the photocurrent of the photosensor, which analog output signal is undesirably accompanied by wideband noise. The analog output signal is supplied to a sigma-delta analog-to-digital converter, the decimation filter of which not only suppresses in the digital signal a component arising from the quantization noise from the sigma-delta modulator portion of the analog-to-digital converter, but also suppresses a component arising from remnant wideband noise from the preamplifier.

REFERENCES:
patent: 4574250 (1986-03-01), Senderowicz
patent: 4633425 (1986-12-01), Senderowicz
patent: 4893316 (1990-01-01), Janc et al.
patent: 4940977 (1990-07-01), Mandell

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