Comparator offset calibration system and analog-to-digital converter with comparator offset calibration
AssigneeMediatek Inc.
InventorChun-Cheng Liu
Life of this patent
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Abstract
A comparator offset calibration system having a comparator offset evaluator and a switched-capacitor network is disclosed, which is in an analog and digital dual domain structure. The comparator offset evaluator receives digital data from an analog-to-digital conversion module, evaluates an offset of a comparator of the analog-to-digital conversion module based on the received digital data, and outputs an evaluated result. The switched-capacitor network processes the evaluated result to generate a control signal. The analog-to-digital conversion module adjusts the offset of the comparator according to the control signal.
Claims15
A comparator offset calibration system, comprising:
- a comparator offset evaluator, receiving digital data from an analog-to-digital conversion module which comprises a comparator, evaluating an offset of the comparator based on the received digital data, and outputting an evaluated result;
- and
- a switched-capacitor network, processing the evaluated result to generate a control signal,
- wherein:
- the comparator offset evaluator outputs the evaluated result in a pulse width modulation form;
- the comparator offset evaluator evaluates the offset of the comparator by long-term judgment of the received digital data;
- and
- the analog-to-digital conversion module adjusts the offset of the comparator according to the control signal.
An analog-to-digital converter, comprising:
- an analog-to-digital conversion module, comprising at least one comparator;
- a comparator offset evaluator, receiving digital data from the analog-to-digital conversion module, evaluating an offset of the at least one comparator based on the received digital data, and outputting evaluated result;
- and
- a switched-capacitor network, processing the evaluated result to generate a control signal,
- wherein:
- the analog-to-digital conversion module adjusts the offset of the comparator according to the control signal,
- the analog-to-digital conversion module comprises a first comparator and a second comparator;
- and
- the first comparator and the second comparator share the comparator offset evaluator and the switched-capacitor network.
Dependencies are inferred from the claim text.