Circuit for monitoring an open collector output circuit with a significant offset
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United States of America Patent
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Nov 18, 2003
Grant Date -
Oct 16, 2003
app pub date -
Apr 11, 2002
filing date -
Apr 11, 2002
priority date (Note) -
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Abstract
A monitoring circuit interfacing an open collector output circuit with a voltage offset, wherein the voltage offset exhibited between the monitoring circuit and the open collector output circuit prevents direct interfacing with a digital input of an adjacent digital circuit. The monitoring circuit of the present invention includes, a first bipolar junction transistor (BJT) connected to an open collector output circuit having a first ground. The first bipolar junction has a second ground that is different from the first ground. The first and second ground creates an appreciable voltage offset therebetween when the first BJT interfaces with the open collector output circuit. The monitoring circuit also includes a second BJT connected to the first BJT in a loop configuration so that at least one of the first and second BJTs increases base current drive to its respective BJT. The monitoring circuit of the present invention therefore maximizes a turn-on rate of its adjacent digital circuit.
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