Pressure sensors circuits
First Claim
Patent Images
1. A pressure sensor circuit comprising:
- a Wheatstone bridge for measuring pressure on the circuit, wherein said Wheatstone bridge produces a first output signal representative of the potential across the Wheatstone bridge and a second output signal representative of said pressure;
an amplifier circuit for amplifying said first and second output signals;
an analog-to-digital converter for measuring the ratio of said amplified first and second output signals;
an interface coupled to at least one output of said analog-to-digital converter; and
a source for providing a reference signal to said Wheatstone bridge and for providing a reference signal to said analog-to-digital converter.
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Abstract
Implantable pressure sensors and methods for making and using the same are provided. A feature of embodiments of the subject pressure sensors is that they are low-drift sensors. The subject sensors find use in a variety of applications.
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Citations
24 Claims
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1. A pressure sensor circuit comprising:
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a Wheatstone bridge for measuring pressure on the circuit, wherein said Wheatstone bridge produces a first output signal representative of the potential across the Wheatstone bridge and a second output signal representative of said pressure; an amplifier circuit for amplifying said first and second output signals; an analog-to-digital converter for measuring the ratio of said amplified first and second output signals; an interface coupled to at least one output of said analog-to-digital converter; and a source for providing a reference signal to said Wheatstone bridge and for providing a reference signal to said analog-to-digital converter. - View Dependent Claims (2, 3, 4, 5)
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6. A pressure sensor circuit comprising:
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a first Wheatstone bridge for measuring pressure on said circuit, wherein said first Wheatstone bridge produces an output signal representative of said pressure; a second Wheatstone bridge for measuring strain on said circuit wherein said second Wheatstone bridge produces an output signal representative of said strain; an amplifier circuit for amplifying said pressure output signal and said strain output voltage signal; an analog-to-digital converter for measuring the ratio of said amplified pressure output signal to said amplified strain output signal; and an interface coupled to the at least one output of the analog-to-digital converter. - View Dependent Claims (7, 8, 9, 10)
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11. An implantable structure comprising a pressure sensor circuit comprising:
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a Wheatstone bridge for measuring pressure on the circuit, wherein said Wheatstone bridge produces a first output signal representative of the potential across the Wheatstone bridge and a second output signal representative of said pressure; an amplifier circuit for amplifying said first and second output signals;
an analog-to-digital converter for measuring the ratio of said amplified first and second output signals;an interface coupled to at least one output of said analog-to-digital converter; and a source for providing a reference signal to said Wheatstone bridge and for providing a reference signal to said analog-to-digital converter. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. An implantable structure comprising a pressure sensor circuit comprising:
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a Wheatstone bridge for measuring pressure on the circuit, wherein said Wheatstone bridge produces a first output signal representative of the potential across the Wheatstone bridge and a second output signal representative of said pressure; an amplifier circuit for amplifying said first and second output signals;
an analog-to-digital converter for measuring the ratio of said amplified first and second output signals;an interface coupled to at least one output of said analog-to-digital converter; and a source for providing a reference signal to said Wheatstone bridge and for providing a reference signal to said analog-to-digital converter, wherein said implantable structure is configured for implantation into a heart chamber. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification