Successive approximation register analog-to-digital converter
First Claim
1. A method of converting an analog input signal to a digital output code, the method comprising:
- allotting time to a digital-to-analog converter based on an expected voltage swing magnitude of an analog reference signal generated by the digital-to-analog converter;
generating, with the digital-to-analog converter, the analog reference signal to be representative of a digital reference code;
comparing the analog input signal to the analog reference signal in response to expiration of the time allotted to the digital-to-analog converter; and
updating one or more bit positions of the digital output code based on said comparing.
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Accused Products
Abstract
Aspects of a method and apparatus for converting an analog input value to a digital output code are provided. One embodiment of the apparatus includes a digital-to-analog converter, a comparator, and control logic circuitry. The digital-to-analog converter is configured to generate an analog reference value based on a received digital reference value. The comparator is configured to compare an analog input value to the analog reference value after expiration of an allotted settling time for the digital-to-analog converter and generate a comparison result indicative a relationship between the analog input value and the analog reference value. The control logic circuitry is configured to select the allotted settling time for the digital-to-analog converter based on a bit position of a digital output code to be determined, and update the bit position of the digital output code based on the comparison result.
21 Citations
20 Claims
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1. A method of converting an analog input signal to a digital output code, the method comprising:
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allotting time to a digital-to-analog converter based on an expected voltage swing magnitude of an analog reference signal generated by the digital-to-analog converter; generating, with the digital-to-analog converter, the analog reference signal to be representative of a digital reference code; comparing the analog input signal to the analog reference signal in response to expiration of the time allotted to the digital-to-analog converter; and updating one or more bit positions of the digital output code based on said comparing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus, comprising:
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a digital-to-analog converter configured to generate an analog reference signal based on a digital reference code; a timer that tracks time allotted to the digital-to-analog converter; a comparator configured to compare an analog input signal to the analog reference signal in response to expiration of the time allotted to the digital-to-analog converter; and control logic circuitry configured to allot the time to the digital-to-analog converter based on an expected voltage swing magnitude of the analog reference signal generated by the digital-to-analog converter, and update one or more bit positions of a digital output code based on a comparison output of the comparator. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification