Current-boosted positive feedback logarithmic transresistance amplifier for currency validators
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United States of America Patent
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Sep 23, 1997
Grant Date -
N/A
app pub date -
Jun 23, 1995
filing date -
Jun 23, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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