Comparator circuit with precision hysteresis and high input impedance
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United States of America Patent
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-
May 17, 1994
Grant Date -
N/A
app pub date -
Dec 31, 1991
filing date -
Dec 31, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The amplitude of the hysteresis of the circuit is determined principally by the intensity of the current produced by a generator by means of a 'band gap' reference voltage, an internal resistance of the circuit, and the resistances connected to the emitters of the input-stage transistors, enabling a high degree of precision to be achieved. The inputs of the circuit are defined by the bases of the input-stage transistors and therefore have high impedance. The preferred application is for forming interface circuits for sensors to be fitted in motor vehicles.
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