Importance

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Abstract

An adjustable threshold window circuit having low-input bias current and constant percentage threshold hysteresis. The window circuit defines an upper reference voltage and a lower reference voltage, both simultaneously adjusted from a common signal wherein the upper threshold voltage increases as the lower voltage threshold decreases to define a voltage window. The threshold voltages are received by a comparator circuit which receives signals to be compared to the upper and lower voltage references, and provides an overvoltage and undervoltage fault indication when the received signals exceed the respective thresholds. Theovervoltage and undervoltage fault signals are received by the window circuit, providing an adjustment of the reference voltages to produce a hysteresis effect. The hysteresis is simultaneously adjusted to be proportional to the voltage window as the reference voltages are adjusted, wherein the hysteresis produced maintains a constant percentage or proportion throughout the range of reference voltages.

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First Claim