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US 2013/0093467 A1Published application
Foreground techniques for comparator calibration
AssigneeAnalog Devices, Inc.
InventorsStephen Robert KOSIC, Jeffrey BRAY
Life of this patent
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Abstract
A method and a device for canceling an offset voltage in an output of a comparator circuit include applying a signal to a first input of the comparator as a function of an initial tap point in a resistor ladder. While the signal is applied to the first input, a nominal voltage is applied to a second input of the comparator, and then an output of the comparator is analyzed. The signal to the first input is changed in response to the analyzing, by accessing a different tap point in the resistor ladder.
Claims18
A method for calibrating a comparator, comprising:
- applying a signal to a first input of the comparator as a function of an initial tap point in a resistor ladder;
- applying a nominal voltage to a second input of the comparator;
- after applying the signal and the nominal voltage, analyzing an output of the comparator;
- and
- changing the signal to the first input of the comparator in response to the analyzing, by accessing a different tap point in the resistor ladder.
2 more elements
A device for calibrating a comparator, comprising:
- a circuit arrangement that applies a signal to a first input of the comparator as a function of an initial tap point in a resistor ladder;
- a circuit arrangement that applies a nominal voltage to a second input of the comparator;
- and
- a controller performing the steps of:
- after the signal and the nominal voltage are applied, analyzing an output of the comparator;
- and
- changing the signal to the first input of the comparator in response to the analyzing, by accessing a different tap point in the resistor ladder.
4 more elements
Dependencies are inferred from the claim text.