Bar code reader with diode feedback in amplifier

Details Bar code reader with diode feedback in amplifier Bar code reader with diode feedback in amplifier

1983-03-30

1986-03-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

330110, H01J 4014, H03F 136

Patent

active

045785767

ABSTRACT:
An operational amplifier is disclosed having a phototransistor at its input for reading a bar code wherein the saturation point of an operational amplifier is controlled by a clamping feedback voltage having a positive control controlling the saturation point of the operational amplifier while prohibiting the operational amplifier from reaching its saturation point.

REFERENCES:
patent: 3440557 (1969-04-01), Sundeen
patent: 3586991 (1971-06-01), Vosteen
patent: 3949233 (1976-04-01), Gluck
patent: 4218613 (1980-08-01), Bletz
patent: 4227155 (1980-10-01), Lerma
patent: 4323774 (1982-04-01), Kopp
patent: 4349788 (1982-09-01), Sondermeyer
"Linear Applications" for National Semiconductor Corporation printed in 1973 and particular pp. AN20-6, AN20-7 and the General Description for Operational Amplifiers, LM324, pp. 2-190 through 2-198.

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