Analog-to-digital conversion with sampling capacitor pre-charging
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United States of America Patent
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Jun 4, 2019
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Jun 4, 2018
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Jun 4, 2018
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Abstract
The embodiments described herein provide analog-to-digital converters and methods that can reduce the likelihood of excessive voltage drop during the conversion of weakly driven signals while still providing the ability to perform an accurate analog-to-digital conversion. In general, the embodiments described herein reduce the likelihood of excessive voltage drop during the conversion of weakly driven signals by pre-charging the sampling capacitor used in the conversion. For example, the embodiments can apply the buffered input signal apply to the sampling capacitor for a first sampling cycle to pre-charge the sampling capacitor, and then directly apply the unbuffered input signal to the sampling capacitor for a second sampling cycle to final-charge the sampling capacitor. With the sampling capacitor charged using the two stage charging, a digital output corresponding to the charge of the sampling capacitor is generated.
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