HIGH VOLTAGE MONITORING SUCCESSIVE APPROXIMATION ANALOG TO DIGITAL CONVERTER
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Abstract
A successive approximation ADC made of a low voltage configurable differential amplifier and low voltage logic circuits which can convert a high voltage analog input to a digital equivalent. The differential amplifier can be configured as either an op amp or a comparator depending upon the mode of operation. An input capacitor C1 is switchably coupled to an electrode selected for voltage sampling. A switched capacitor array C2 is coupled across the differential amplifier input and output. A SAR coupled to the switched capacitor array provides a digital output corresponding to the sampled analog voltage. During a sampling interval and a charge transfer interval, the differential amplifier is configured as an op amp. During the transfer interval, the voltage on the input capacitor multiplied by the ratio C1/C2 is transferred to the switched capacitor array. During an analog to digital conversion interval, the ADC converts the analog voltage to an equivalent digital output.
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Citations
31 Claims
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1-30. -30. (canceled)
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31. A peripherally-implantable neurostimulation system comprising:
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a plurality of leads, wherein each of the plurality of leads comprises at least one electrode; and an analog-to-digital converter connected to the plurality of leads, wherein the analog-to-digital converter is configurable to operate in a first, sampling mode, and wherein the analog-to-digital converter is reconfigurable to operate in a second, digitization mode.
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Specification