Current-boosted positive feedback logarithmic transresistance am

Details Current-boosted positive feedback logarithmic transresistance am Current-boosted positive feedback logarithmic transresistance am

1995-06-23

1997-09-23

Le, Que

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214LA, 250556, 330 59, H01J 4014

Patent

active

056707754

ABSTRACT:
A current boosted positive feedback logarithmic transresistance amplifier is provided for currency validators. The amplifier has a photo-diode capable of producing a current in response to light, connected to an operational amplifier having both a positive and a negative feedback branch. A logarithmic density amplifier having a feedback resistor and a log diode connected in shunt with the resistor as a dynamic feedback to the amplifier is connected to the positive feedback branch of the current boosting amplifier by way of the log diode. The summing action at the inputs of the current boosting amplifier result in a current at the log diode that is a direct multiple of the current in the photo-diode.

REFERENCES:
patent: 4096382 (1978-06-01), Numata et al.
patent: 4366440 (1982-12-01), Olson et al.
patent: 5030925 (1991-07-01), Taylor
patent: 5523575 (1996-06-01), Machida et al.

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