Pipeline ADC calibrating method and apparatus thereof
AssigneeRealtek Semiconductor Corp.
InventorsJui-Yuan Tsai, Wen-Chi Wang, Chia-Liang Chiang, Chao-Cheng Lee
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Abstract
A pipeline ADC has a plurality of analog-to-digital conversion units cascaded in series to form a pipeline. An error correcting method for the pipeline ADC includes during a first mode, measuring the plurality of analog-to-digital conversion units utilizing an extra analog-to-digital conversion module; calculating a plurality of correction constant sets according to digital output values of the extra analog-to-digital conversion module in the measuring step; and during a second mode, correcting output signals of the plurality of analog-to-digital conversion units according to the correction constant sets.
Claims11
An error correcting method for a pipeline analog-to-digital converter (ADC), the pipeline ADC having a plurality of analog-to-digital conversion units cascaded in series to form a pipeline having an input state and a plurality of subsequent stages, the method comprising the following steps:
- during a first mode, multiplexing analog outputs of the subsequent stages to output each analog output to an extra analog-to-digital conversion module, and generating digital output values according to the analog outputs by utilizing the extra analog-to-digital conversion module;
- calculating a plurality of correction constant sets according to the digital output values;
- and
- during a second mode, correcting output signals of the plurality of analog-to-digital conversion units according to the correction constant sets.
A digitally calibrated pipeline analog-to-digital converter (ADC) for converting an analog input signal into a digital output signal, the pipeline ADC comprising:
- a plurality of analog-to-digital conversion units cascaded in series forming a pipeline having an input state and a plurality of subsequent stages;
- an extra analog-to-digital conversion module;
- a multiplexer, coupled to the subsequent stages and the extra analog-to-digital conversion module, for multiplexing analog outputs of the subsequent stages to output each analog output to the extra analog-to-digital conversion module during a first mode, wherein the extra analog-to-digital conversion module measures the plurality of analog-to-digital conversion units to generate digital output values associated with the analog outputs during the first mode;
- a correction unit coupled to the analog-to-digital conversion units and the extra analog-to-digital conversion module for correcting output signals of the plurality of analog-to-digital conversion units during a second mode according to results of the measurement performed by the extra analog-to-digital conversion module.
Dependencies are inferred from the claim text.