Calibration circuit and method of use
First Claim
1. A calibration circuit, comprising:
- a single-wire memory comprising a power/interrogation terminal and a ground terminal, said single-wire memory configured to store calibration data for a sensor;
a transmission line configured to be coupled between the sensor and a sensor reader, said transmission line comprising;
a first conductor coupled to said power/interrogation terminal and configured to provide the calibration data and a sensor output signal to the sensor reader; and
a second conductor coupled to said ground terminal and configured to provide a ground reference for said first conductor, said single-wire memory, and the sensor; and
an inductor coupled in series between said first conductor and said power/interrogation terminal, said inductor configured to provide a high impedance path from the sensor to said single-wire memory for the sensor output signal.
1 Assignment
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Accused Products
Abstract
A calibration circuit includes a single-wire memory and a transmission line. The single-wire memory includes a power/interrogation terminal and a ground terminal. The single-wire memory is configured to store calibration data for a sensor. The transmission line is configured to be coupled between the sensor and a sensor reader. The transmission line includes first and second conductors. The first conductor is coupled to the power/interrogation terminal and is configured to provide the calibration data and a sensor output signal to the sensor reader. The second conductor is coupled to the ground terminal and is configured to provide a ground reference for the first conductor, the single-wire memory, and the sensor.
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Citations
17 Claims
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1. A calibration circuit, comprising:
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a single-wire memory comprising a power/interrogation terminal and a ground terminal, said single-wire memory configured to store calibration data for a sensor; a transmission line configured to be coupled between the sensor and a sensor reader, said transmission line comprising; a first conductor coupled to said power/interrogation terminal and configured to provide the calibration data and a sensor output signal to the sensor reader; and a second conductor coupled to said ground terminal and configured to provide a ground reference for said first conductor, said single-wire memory, and the sensor; and an inductor coupled in series between said first conductor and said power/interrogation terminal, said inductor configured to provide a high impedance path from the sensor to said single-wire memory for the sensor output signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of using a calibration circuit for a sensor, said method comprising:
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powering a single-wire memory over a single conductor transmission line; interrogating the single-wire memory over the single conductor transmission line; generating a sensor output signal indicative of a measured parameter; transmitting the sensor output signal on the single conductor transmission line from the sensor toward a sensor reader; wherein transmitting the sensor output signal further comprises; creating an RF high impedance path from the single conductor transmission line to the single-wire memory; and creating an RF short circuit across power/interrogation and ground terminals of the single-wire memory. - View Dependent Claims (8, 9, 10, 11)
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12. A radio frequency (RF) sensor system comprising:
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an RF sensor configured to detect at least one of an environmental parameter and a physical parameter and generate a sensor output signal indicative thereof; a sensor reader configured to receive the sensor output signal and calibration data for said RF sensor; a transmission line comprising a single conductor coupled between said RF sensor and said sensor reader, said transmission line configured to conduct the sensor output signal; a single-wire memory coupled to said single conductor and configured to; store the calibration data; and transmit the calibration data on said single conductor upon interrogation by said sensor reader; and an inductor coupled between said single conductor and a power/interrogation terminal of said single-wire memory, said inductor configured to reduce loading on said transmission line. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification