Operational amplifier with current-controlled up or down hysteresis
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United States of America Patent
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May 16, 2017
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N/A
app pub date -
Jan 11, 2016
filing date -
Jan 11, 2016
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Abstract
Disclosed is an op-amp circuit with current-controlled hysteresis that is insensitive to PVT variations. In the circuit, a digital output signal is output from an output buffer based on the output voltage at an output node of an op-amp. A current source is connected to the input side of the op-amp or one of multiple current sources is selectively connected to the input side and enabled when the digital output signal has a high value to provide falling edge hysteresis. Alternatively, a current source is connected to the reference side of the op-amp or one of multiple current sources is selectively connected to the reference side and enabled when the digital output signal is low to provide rising edge hysteresis. Alternatively, current sources are connected to both the input and reference sides and selectively controlled to provide either falling or rising edge hysteresis.
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