Asynchronous SAR ADC with conversion speed control feedback loop
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United States of America Patent
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Jan 16, 2018
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app pub date -
Feb 6, 2017
filing date -
Feb 6, 2017
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Abstract
Systems and circuits for feedback control of an asynchronous successive approximation register (SAR) analog-to-digital converter (ADC) are described. An example system includes the asynchronous SAR ADC. A timing detector circuit is coupled to the asynchronous SAR ADC to receive one or more internal signals from the asynchronous SAR ADC. The timing detector circuit outputs a timing detector signal representing an internal timing of the SAR ADC. The timing detector signal is generated based on the one or more internal signals. A regulator circuit is coupled to the timing detector circuit to receive the timing detector signal. The regulator circuit is also coupled to the asynchronous SAR ADC to output a feedback signal to the asynchronous SAR ADC. The feedback signal is generated based on the timing detector signal to control the internal timing of the SAR ADC to match a target timing.
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