Low power A/D converter
First Claim
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1. A method of cardiac signal analysis comprising:
- capturing an electrical signal between implanted electrodes;
receiving the electrical signal on a first chip carrying a plurality of analog components;
sampling the electrical signal to create a first sample;
generating an output from the first chip by comparing the first sample to a stored sample;
receiving the output from the first chip on a second chip; and
generating a digital signal on the second chip indicative of the amplitude of the captured electrical signal.
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Abstract
A comparator is arranged to compare a series of analog voltage signal samples on a first capacitor with a voltage on a second capacitor which is linearly increased or decreased to equal the sample value. The comparator'"'"'s single output freezes the count of the counter at counts which are proportional to the voltage of the respective samples. In this manner, analog to digital conversion can be accomplished using a single line between the analog and digital sides of a circuit, thereby reducing parasitic capacitance.
99 Citations
20 Claims
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1. A method of cardiac signal analysis comprising:
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capturing an electrical signal between implanted electrodes;
receiving the electrical signal on a first chip carrying a plurality of analog components;
sampling the electrical signal to create a first sample;
generating an output from the first chip by comparing the first sample to a stored sample;
receiving the output from the first chip on a second chip; and
generating a digital signal on the second chip indicative of the amplitude of the captured electrical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An implantable medical device comprising at least first and second implantable electrodes and operational circuitry including a first chip and a second chip, the operational circuitry configured to perform a method of cardiac signal analysis comprising:
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capturing an electrical signal between the implantable electrodes;
receiving the electrical signal on the first chip;
sampling the electrical signal to create a first sample;
generating an output from the first chip by comparing the first sample to a stored sample;
receiving the output from the first chip on the second chip; and
generating a digital signal on the second chip indicative of the amplitude of the captured electrical signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of cardiac signal analysis comprising:
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capturing a cardiac signal from electrodes implanted in a patient;
sampling a first sample related to a magnitude of the captured signal;
generating an output having a duration and a sign, the duration indicative of an magnitude of difference between the first sample and a previous sample and the sign indicative of a direction of difference between the first sample and a previous sample;
receiving the output at a counter and generating a digital output indicative of the magnitude of the first sample. - View Dependent Claims (18, 19, 20)
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Specification