Method and apparatus for establishing a threshold with the use of a delay line
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United States of America Patent
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Dec 28, 1993
Grant Date -
N/A
app pub date -
Jan 31, 1992
filing date -
Jan 31, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A threshold setting circuit receives a signal coupled to the signal terminal of a comparator, delays then amplifies the signal and couples the delayed-amplified signal through a switch to the threshold signal terminal of the comparator. Prior to the reception of a signal which exceeds the threshold, the threshold level is set at the amplified noise level which is stored in storage means coupled to the threshold signal terminal. When the signal exceeds the amplified noise level, the switch is opened prior to the time that the delayed amplified signal is coupled to the threshold signal terminal and stored with the amplified noise in the storage means. Sometime after the signal ceases to exceed the amplified noise threshold level the switch is closed and the storage means tracks the amplified noise to maintain a current threshold level.
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