Temperature compensated pressure sensor network
First Claim
1. A temperature compensated pressure sensor network for providing an output sensing signal representative of an applied pressure, comprising:
- a reference oscillator circuit for providing a reference signal having an associated reference frequency, said oscillator circuit including a first inductor wherein said reference frequency is a predetermined function of a first inductance associated with said first inductor;
a sensor circuit for providing a sensing signal having an associated sensing frequency, said sensor circuit including a second inductor and a sensing capacitor electrically coupled in series, wherein said sensing frequency is a predetermined function of a second inductance associated with said second inductor and said applied pressure;
a processor for receiving said reference signal and said sensing signal and producing an output sensing signal being a predetermined function of said reference signal and said sensing signal;
wherein said first inductor is physically oriented with respect to said second inductor so as to minimize effects of (i) an inductive coupling, and (ii) a parametric variation, between said first inductor and said second inductor.
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Accused Products
Abstract
A temperature compensated pressure sensor network for providing an output sensing signal representative of an applied pressure includes a reference oscillator circuit for providing a reference signal having an associated reference frequency. The oscillator circuit includes a first inductor pair electrically coupled in series, wherein the reference frequency is a predetermined function of a first inductance associated with the first inductor pair. The sensor network further includes a sensor circuit for providing a sensing signal having an associated sensing frequency. The sensor circuit includes a second inductor pair and a sensing capacitor electrically coupled in series, wherein the sensing frequency is a predetermined function of a second inductance associated with the second inductor pair and the applied pressure. The sensor network also includes a processor for receiving the reference signal and the sensing signal, and producing the output sensing signal. The output sensing signal is a predetermined function of the reference signal and the sensing signal. The first inductor pair is oriented with respect to the second inductor pair so as to minimize effects of inductive coupling, and temperature variation, between the first inductor pair and the second inductor pair. The first inductor and the second inductor are preferably electrically coupled in series opposition, and the third inductor and the fourth inductor are preferably electrically coupled in series opposition. The first inductor pair is preferably oriented substantially orthogonal to the second inductor pair.
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Citations
15 Claims
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1. A temperature compensated pressure sensor network for providing an output sensing signal representative of an applied pressure, comprising:
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a reference oscillator circuit for providing a reference signal having an associated reference frequency, said oscillator circuit including a first inductor wherein said reference frequency is a predetermined function of a first inductance associated with said first inductor;
a sensor circuit for providing a sensing signal having an associated sensing frequency, said sensor circuit including a second inductor and a sensing capacitor electrically coupled in series, wherein said sensing frequency is a predetermined function of a second inductance associated with said second inductor and said applied pressure;
a processor for receiving said reference signal and said sensing signal and producing an output sensing signal being a predetermined function of said reference signal and said sensing signal;
wherein said first inductor is physically oriented with respect to said second inductor so as to minimize effects of (i) an inductive coupling, and (ii) a parametric variation, between said first inductor and said second inductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of providing an output sensing signal representative of an applied pressure, comprising the steps of:
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providing a reference signal having an associated reference frequency and being generated by an oscillator circuit including a first inductor pair electrically coupled in series, wherein said reference frequency is a predetermined function of a first inductance associated with said first inductor pair;
providing a sensing signal having an associated sensing frequency and being generated by a sensor circuit including a second inductor pair and a sensing capacitor electrically coupled in series, wherein said sensing frequency is a predetermined function of a second inductance associated with said second inductor pair and said applied pressure;
producing said output sensing signal being a predetermined function of said reference signal and said sensing signal; and
,physically orienting said first inductor pair with respect to said second inductor pair so as to minimize effects of (i) an inductive coupling, and (ii) a parametric variation, between said first inductor pair and said second inductor pair. - View Dependent Claims (14)
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15. A temperature compensated pressure sensor network for providing an output sensing signal representative of an applied pressure, comprising:
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a reference oscillator circuit for providing a reference signal having an associated reference frequency, said oscillator circuit including a first inductor pair electrically coupled in series, wherein said reference frequency is a predetermined function of a first inductance associated with said first inductor pair;
a sensor circuit for providing a sensing signal having an associated sensing frequency, said sensor circuit including a second inductor pair and a sensing capacitor electrically coupled in series, wherein said sensing frequency is a predetermined function of a second inductance associated with said second inductor pair and said applied pressure;
a processor for receiving said reference signal and said sensing signal and producing an output sensing signal being a predetermined function of said reference signal and said sensing signal;
wherein said first inductor pair is physically oriented with respect to said second inductor pair so as to minimize effects of (i) an inductive coupling, and (ii) a parametric variation, between said first inductor pair and said second inductor pair.
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Specification