Offset removal circuitry for photoreceiver signals

Details Offset removal circuitry for photoreceiver signals Offset removal circuitry for photoreceiver signals

1997-09-05

1999-05-04

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214A, 327307, H01J 4014

Patent

active

059006250

ABSTRACT:
A method for transferring signals from a photoreceiver array to computational circuitry in which parallel transfer amplifiers receive periodic offset correction. In a first embodiment, each transfer amplifier has a differential circuit that can be switched from a reset mode to a readout mode. In the readout mode, the voltage state at the output is responsive to first and second inputs, with the second input being connected to a source of a reference voltage. In the reset mode, the inputs are both connected to the reference voltage and the output is temporarily connected to a source of a fixed reset voltage. An offset adjustment signal is generated in response to detection of a voltage difference between the reset voltage and the actual voltage state at the output after the output has been disconnected from the source of the reset voltage. A single offset circuit is used to periodically and sequentially refresh the various transfer amplifiers.

REFERENCES:
patent: 3937874 (1976-02-01), Carbone
patent: 5352884 (1994-10-01), Petrick et al.

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