Comparator with Self-Limiting Positive Feedback
AssigneeRobert Bosch GmbH
InventorsRobert Wolf, Christoph Lang, Xinyu Xing, Sam Kavusi
Life of this patent
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Abstract
A method and circuit for attenuating positive feedback in a comparator in one embodiment includes an amplifier configured to compare a first input signal with a second input signal and to provide an output based upon the comparison, a non-linear function with a first input operably connected to an output of the amplifier, and a feedback loop operably connected to the output of the non-linear function and to a second input of the non-linear function, the feedback loop including a feedback limiting circuit configured to attenuate a feedback signal to the second input of the non-linear function.
Claims12
A comparator circuit comprising:
- an amplifier configured to compare a first input signal with a second input signal and to provide an output signal at an output of the amplifier based upon the comparison;
- a non-linear function having a single input and a single output, the single input being operatively connected to the output of the amplifier;
- and
- a feedback loop operably operatively connected to the signal output of the non linear function, the feedback loop including a feedback limiting circuit that is operatively connected to a positive feedback final, the feedback limiting circuit being configured to attenuate the positive feedback signal.
7-13. (canceled)
A comparator circuit comprising:
- an amplifier configured to compare a first input signal with a second input signal and to provide an output signal at an output of the amplifier based upon the comparison;
- a positive feedback circuit operatively connected to the output of the amplifier and configured to generate a positive feedback signal, the positive feedback circuit including a MOSFET with a gate operatively connected to the output of the amplifier, the MOSFET being configured to generate the positive feedback signal;
- and
- a capacitor in direct electrical communication with either a source or a drain of the MOSFET, the capacitor attenuating the positive feedback signal generated by the MOSFET.
Dependencies are inferred from the claim text.