Method for testing comparator and device therefor
First Claim
1. A device comprising:
- a comparator comprising a first comparator input, a second comparator input, and a comparator output;
a selection circuit comprising a first data input, a second data input, a select input and an output coupled to the first input of the comparator, the first input to receive a first voltage identifying a first extreme voltage of an operational voltage range, the second input coupled to receive a second voltage, the first extreme voltage between the first voltage and a second extreme voltage of the operational voltage range; and
a delay path between the output of the comparator and the select input of the selection circuit that asynchronously selects the first data input of the selection circuit responsive to the second input being previously selected.
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Accused Products
Abstract
An integrated circuit facilitates a self test routine that verifies proper operation of an analog comparator. In response to entering the self test routine, the voltage provided to an input of a comparator is changed from being at an operating voltage supply to being at a self test voltage that is used to verify operation of the comparator. In response to the comparator operating properly, the self test voltage provided to the input of the comparator is replaced with the operating voltage supply, and normal operation resumes. The duration of the self test cycle is based upon the amount of time during which the self test voltage is provided to the comparator is asynchronous in nature, and therefore not a function of a clock signal.
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Citations
6 Claims
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1. A device comprising:
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a comparator comprising a first comparator input, a second comparator input, and a comparator output; a selection circuit comprising a first data input, a second data input, a select input and an output coupled to the first input of the comparator, the first input to receive a first voltage identifying a first extreme voltage of an operational voltage range, the second input coupled to receive a second voltage, the first extreme voltage between the first voltage and a second extreme voltage of the operational voltage range; and a delay path between the output of the comparator and the select input of the selection circuit that asynchronously selects the first data input of the selection circuit responsive to the second input being previously selected. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification