Cyclic ADC with voting and adaptive averaging
AssigneeSenbiosys
InventorsAssim Boukhayma, Massimiliano Bracco, Antonino Caizzone
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Abstract
A cyclic analog to digital converter for digitizing an output from a photoplethysmography sensor has a buffer amplifier for setting a voltage of the feedback capacitance. Additionally, digital averaging circuit is preferably provided for averaging the digital output from the cyclic analog to digital converter for the several conversions. Finally, voting logic is additionally provided for declaring the digital bits based on successive comparisons by the one or more comparators.
Claims14
A cyclic analog to digital converter for digitizing an output from a photoplethysmography sensor, the analog to digital converter comprising:
- an operational transconductance amplifier;
- an input capacitance for sampling an input voltage to the operational transconductance amplifier;
- a feedback capacitance providing feedback between an output and an input for the operational transconductance amplifier;
- and
- a buffer amplifier for resetting a voltage of the feedback capacitance to remove any residual charge on the feedback capacitance.
A cyclic analog to digital converter for digitizing an output from a photoplethysmography sensor, the analog to digital converter comprising:
- an operational transconductance amplifier;
- an input capacitance for sampling an input voltage to the operational transconductance amplifier;
- a feedback capacitance providing feedback between an output and an input for the operational transconductance amplifier;
- and
- one or more comparators for determining digital bits of the output from the photoplethysmography sensor based on a voltage on the input capacitance;
- and
- voting logic for declaring each of the digital bits of the output from the photoplethysmography sensor based on successive comparisons by the one or more comparators for each of the bits;
- wherein the output of the one or more comparators is stored at least three times for each bit and the voting logic selects the more frequent bit output for each bit.
Dependencies are inferred from the claim text.