Reset circuit using comparator with built-in hysteresis

Details Reset circuit using comparator with built-in hysteresis Reset circuit using comparator with built-in hysteresis

1997-07-25

1999-03-09

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327198, 327205, 327 74, H03K 1722

Patent

active

058806113

ABSTRACT:
A comparator with a built-in offset is disclosed. The claimed comparator includes a bias current circuit, a differential input stage with the built-in of-set, and a hysteresis circuit. The built-in offset is generated by using a resistor in the differential input stage of the comparator such that the resistor is driven by the bias current as well as the current generated by the hysteresis circuit. Additionally, a reset circuit which uses the comparator with the built-in offset is claimed. The reset circuit uses a voltage divider circuit to divide a first input voltage to the comparator. A band-gap voltage reference is used to provide a second input voltage to the comparator. Therefore, the reset circuit generates a reset signal when the divided voltage reaches the value of the band-gap voltage plus the offset. In another embodiment, a comparator having a differential input stage, an output stage, and a bias circuit with a hysteresis circuit is disclosed. The hysteresis circuit selectively applies a bias voltage to the differential input stage to achieve the hysteresis.

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