Ultra low power interface using adaptive successive approximation register
First Claim
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1. A method, comprising:
- receiving an analog signal by an analog-to-digital (A/D) converter having a full scale range and a total number of bits spanning the full scale range;
converting the analog signal to a digital signal by the A/D converter over a plurality of conversion cycles using an adaptable bit number on at least a current conversion cycle of the plurality of conversion cycles, wherein the adaptable bit number comprises an adapted number of bits spanning a portion of the full scale range that is less than the full scale range of the total number of bits;
determining whether a sample point of the analog signal is within the portion of the full scale range spanned by the adapted number of bits;
decreasing the adaptable bit number used for a subsequent conversion cycle of the plurality of conversion cycles in response to the sample point of the analog signal being within the portion of the full scale range; and
decreasing the adaptable bit number after a predetermined number of analog signal sample points are within the portion of the full scale range.
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Abstract
A medical device and associated method convert an analog signal using an adaptable bit number. The medical device includes an analog-to-digital (A/D) converter for receiving an analog signal. The A/D converter has a full scale range and a total number of bits spanning the full scale range. The A/D converter converts the analog signal to a digital signal over conversion cycles using an adaptable bit number so that on at least a portion of the conversion cycles an adapted number of bits spanning a portion of the full scale range less than the total number of bits is used by the A/D converter to convert the analog signal.
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Citations
20 Claims
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1. A method, comprising:
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receiving an analog signal by an analog-to-digital (A/D) converter having a full scale range and a total number of bits spanning the full scale range; converting the analog signal to a digital signal by the A/D converter over a plurality of conversion cycles using an adaptable bit number on at least a current conversion cycle of the plurality of conversion cycles, wherein the adaptable bit number comprises an adapted number of bits spanning a portion of the full scale range that is less than the full scale range of the total number of bits; determining whether a sample point of the analog signal is within the portion of the full scale range spanned by the adapted number of bits; decreasing the adaptable bit number used for a subsequent conversion cycle of the plurality of conversion cycles in response to the sample point of the analog signal being within the portion of the full scale range; and decreasing the adaptable bit number after a predetermined number of analog signal sample points are within the portion of the full scale range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A medical device, comprising
an analog-to-digital (A/D) converter configured to receive an analog signal and having a full scale range and a total number of bits spanning the full scale range, the A/D converter configured to convert the analog signal to a digital signal over a plurality of conversion cycles using an adaptable bit number on at least a current conversion cycle of the plurality of conversion cycles, wherein the adaptable bit number comprises an adapted number of bits spanning a portion of the full scale range that is less than the full scale range of the total number of bits, wherein the A/D converter is configured to: -
determine whether a sample point of the analog signal is within the portion of the full scale range spanned by the adapted number of bits; decrease the adaptable bit number for a subsequent conversion cycle of the plurality of conversion cycles if the sample point of the analog signal is within the portion of the full scale range, and decrease the adaptable bit number after a predetermined number of analog signal sample points are within the portion of the full scale range. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A medical device, comprising:
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receiving means for receiving an analog signal; converting means for converting the analog signal to a digital signal over a plurality of conversion cycles; and controlling means for adjusting an adaptable number of bits used by the converting means for converting the analog signal over the plurality of conversion cycles, the adaptable number of bits spanning less than a full scale range of the converting means for at least one of the plurality of conversion cycles; and means for determining whether a sample point of the analog signal is within the portion of the full scale range spanned by the adapted number of bits; wherein the converting means is configured to decrease the adaptable bit number used for a subsequent conversion cycle of the plurality of conversion cycles in response to the sample point of the analog signal being within the portion of the full scale range; and decrease the adaptable bit number after a predetermined number of analog signal sample points are within the portion of the full scale range.
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20. A non-transitory computer readable storage medium
storing a set of instructions executable by a control module of an analog-to-digital (A/D) converter included in a medical device for causing the control module to: -
enable the A/D converter to convert an analog signal to a digital signal over a plurality of conversion cycles using an adaptable bit number; and adjust the adaptable bit number for at least one of the plurality of conversion cycles to a number of bits that span a portion of a full scale range of the A/D converter that is less than the full scale range of the A/D converter spanned by a total number of available bits of the A/D converter; determine whether a sample point of the analog signal is within the portion of the full scale range spanned by the adapted number of bits; decrease the adaptable bit number used for a subsequent conversion cycle of the plurality of conversion cycles in response to the sample point of the analog signal being within the portion of the full scale range; and decrease the adaptable bit number after a predetermined number of analog signal sample points are within the portion of the full scale range.
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Specification