Circuit for heartbeat detection and beat timing extraction
First Claim
1. A detection device for amplifying and detecting a periodic signal for storage, transmission, display or processing, the detection device comprising:
- a preamplifier cell having a plurality of input terminals and an output terminal, the preamplifier cell amplifying the periodic signal presented at one or more of its input terminals to form a first amplified periodic signal;
a signal amplifier cell having an input terminal and an output terminal, the input terminal of the signal amplifier cell in communication with the output terminal of the preamplifier cell, the signal amplifier cell amplifying the first amplified periodic signal presented at its input terminal, the signal amplifier having a bandwidth sufficient to form a filtered amplified periodic signal preserving the highest frequency pulsatile periodic features of the first amplified periodic signal;
a baseline amplifier cell having an input terminal and an output terminal, the input terminal of the baseline amplifier cell in communication with the output terminal of the preamplifier cell, the baseline amplifier amplifying the first amplified periodic signal presented at its input terminal and having a bandwidth sufficient to form a baseline signal that preserves a baseline voltage while removing the periodic features of the first amplified periodic signal;
a comparator cell having a first input terminal and a second input terminal and an output terminal, the first input terminal of the comparator cell in communication with the output terminal of the signal amplifier cell; and
a VDC cell having a first terminal in communication with the output terminal of the baseline amplifier cell and an output terminal in communication with the second input terminal of the comparator cell, the VDC cell adding a DC offset to the baseline signal to form an offset baseline signal at its output terminal,wherein the comparator cell generates an output signal in response to the filtered amplified periodic signal from the signal amplifier cell and the offset baseline signal from the VDC cell, the comparator cell output signal comprising a plurality of pulses corresponding to peaks in the periodic signal.
1 Assignment
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Accused Products
Abstract
A circuit and method for long term electrocardiogram (ECG) monitoring is implemented with the goal of reducing power consumption, battery size, and consequently device size. In one embodiment, the integrated circuit includes an amplifier cell having a plurality of input terminals and an output terminal; a QRS amplifier cell in communication with the output of the amplifier cell; a baseline amplifier cell in communication with the output of the amplifier cell; a comparator cell having a first input terminal in communication with the output terminal of the QRS amplifier cell; and a VDC cell having an input in communication with the output of the baseline amplifier cell and an output in communication with the second input terminal of the comparator cell, wherein the comparator cell generates an output pulse in response to the output signal from the amplifier cell and the output signal from the baseline amplifier cell.
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Citations
16 Claims
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1. A detection device for amplifying and detecting a periodic signal for storage, transmission, display or processing, the detection device comprising:
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a preamplifier cell having a plurality of input terminals and an output terminal, the preamplifier cell amplifying the periodic signal presented at one or more of its input terminals to form a first amplified periodic signal; a signal amplifier cell having an input terminal and an output terminal, the input terminal of the signal amplifier cell in communication with the output terminal of the preamplifier cell, the signal amplifier cell amplifying the first amplified periodic signal presented at its input terminal, the signal amplifier having a bandwidth sufficient to form a filtered amplified periodic signal preserving the highest frequency pulsatile periodic features of the first amplified periodic signal; a baseline amplifier cell having an input terminal and an output terminal, the input terminal of the baseline amplifier cell in communication with the output terminal of the preamplifier cell, the baseline amplifier amplifying the first amplified periodic signal presented at its input terminal and having a bandwidth sufficient to form a baseline signal that preserves a baseline voltage while removing the periodic features of the first amplified periodic signal; a comparator cell having a first input terminal and a second input terminal and an output terminal, the first input terminal of the comparator cell in communication with the output terminal of the signal amplifier cell; and a VDC cell having a first terminal in communication with the output terminal of the baseline amplifier cell and an output terminal in communication with the second input terminal of the comparator cell, the VDC cell adding a DC offset to the baseline signal to form an offset baseline signal at its output terminal, wherein the comparator cell generates an output signal in response to the filtered amplified periodic signal from the signal amplifier cell and the offset baseline signal from the VDC cell, the comparator cell output signal comprising a plurality of pulses corresponding to peaks in the periodic signal. - View Dependent Claims (2, 3, 4, 5)
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5. The detection device of claim 1, wherein the preamplifier cell is a PGA amplifier.
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6. A method for amplifying and detecting a periodic physiological signal comprising the steps of:
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amplifying a signal from a physiological signal source using a first amplifier to form a first amplified signal; amplifying the first amplified signal with a second amplifier having a bandwidth sufficient to form a filtered first amplified signal preserving the with highest frequency pulsatile periodic features of the first amplified signal; amplifying the first amplified signal with a third amplifier having a bandwidth sufficient to form a baseline signal that preserves a baseline voltage while removing the periodic features of the physiological signal; adding a DC offset to the baseline signal to form an offset baseline signal using an adder; comparing the filtered amplified signal to the offset baseline signal using a comparator; and generating an output signal if the filtered amplified signal is greater than the offset baseline, the output signal comprising a plurality of pulses corresponding to peaks in the periodic physiological signal for storage, transmission, display or processing. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification