Abstract: Disclosed are hypertension systems and related methods that include a blood pressure sensor located or implanted under the skin of a patient, and electronics, which may have the size and shape of a wrist watch, for example, that monitors the blood pressure of the patient by communicating with the implanted sensor.

Abstract: Disclosed are hypertension systems and related methods that include a blood pressure sensor located or implanted under the skin of a patient, and electronics, which may have the size and shape of a wrist watch, for example, that monitors the blood pressure of the patient by communicating with the implanted sensor.

Abstract: A communication system for communicating with an implanted wireless sensor is provided. A transmit antenna element can propagate an energizing signal onto a communication medium and a receive antenna element can recover a responsive implanted sensor response signal. The antenna box includes a power amplifier for amplifying the energizing signal and timing regeneration circuitry for detecting an end to signals and outputting control signals for selecting mode operation. The antenna box can receive the energizing signal from the antenna cable in a transmit mode and provide the implanted sensor response signal to the antenna cable in a receive mode. The antenna box can communicate with an electronic box and/or conversion box that provide and receive signals and provide power via the antenna cable.

Abstract: Disclosed are hypertension systems and related methods that include a blood pressure sensor located or implanted under the skin of a patient, and electronics, which may have the size and shape of a wrist watch, for example, that monitors the blood pressure of the patient by communicating with the implanted sensor.

Abstract: The present invention determines the resonant frequency of a wireless sensor by adjusting the phase and frequency of an energizing signal until the frequency of the energizing signal matches the resonant frequency of the sensor. The system energizes the sensor with a low duty cycle, gated burst of RF energy having a predetermined frequency. The system receives the ring down response of the sensor and determines the resonant frequency of the sensor, which is used to calculate a physical parameter. The system uses a pair of phase locked loops to adjust the phase and the frequency of the energizing signal. The system identifies false locks by detecting an unwanted beat frequency in the coupled signal, as well as determining whether the coupled signal exhibits pulsatile characteristics that correspond to a periodic physiological characteristic, such as blood pressure.

Abstract: Certain embodiments of the present invention provide a loosely-coupled oscillator including a circuit and an electronic device that are not physically connected. The electronic device may include an amplifier for amplifying a signal to produce an output signal and include a wire connected to an input of the amplifier. The wire can be electromagnetically coupled to the circuit that is physically disconnected from the electronic device. The output signal can be produced at an output of the amplifier without transmitting an excitation signal from the electronic device to the circuit and when the wire is electromagnetically coupled to the circuit.

Abstract: A communication system for communicating with an implanted wireless sensor is provided. A transmit antenna element can propagate an energizing signal onto a communication medium and a receive antenna element can recover a responsive implanted sensor response signal. The antenna box includes a power amplifier for amplifying the energizing signal and timing regeneration circuitry for detecting an end to signals and outputting control signals for selecting mode operation. The antenna box can receive the energizing signal from the antenna cable in a transmit mode and provide the implanted sensor response signal to the antenna cable in a receive mode. The antenna box can communicate with an electronic box and/or conversion box that provide and receive signals and provide power via the antenna cable.

Abstract: The present invention determines the resonant frequency of a wireless sensor by adjusting the phase and frequency of an energizing signal until the frequency of the energizing signal matches the resonant frequency of the sensor. The system energizes the sensor with a low duty cycle, gated burst of RF energy having a predetermined frequency. The system receives the ring down response of the sensor and determines the resonant frequency of the sensor, which is used to calculate a physical parameter. The system uses a pair of phase locked loops to adjust the phase and the frequency of the energizing signal. The system identifies false locks by detecting an unwanted beat frequency in the coupled signal, as well as determining whether the coupled signal exhibits pulsatile characteristics that correspond to a periodic physiological characteristic, such as blood pressure.

Abstract: Aspects and embodiments of the present invention provide a loosely-coupled oscillator including a sensor circuit and an electronic device that are not physically connected. In some embodiments, the electronic device includes an amplifier stage and a feedback network and the sensor circuit includes one or more LC circuits. When electromagnetically connected, the sensor circuit and electronic device form an oscillator that is adapted to output an oscillation signal. The resonant frequency of the sensor circuit can be obtained based on the oscillation signal. The sensor circuit may be implanted into an object and the resonant frequency of the sensor circuit can be used to determine characteristics of the object.

Abstract: The present invention determines the resonant frequency of a wireless sensor by adjusting the phase and frequency of an energizing signal until the frequency of the energizing signal matches the resonant frequency of the sensor. The system energizes the sensor with a low duty cycle, gated burst of RF energy having a predetermined frequency. The system receives the ring down response of the sensor and determines the resonant frequency of the sensor, which is used to calculate a physical parameter. The system uses a pair of phase locked loops to adjust the phase and the frequency of the energizing signal. The system identifies false locks by detecting an unwanted beat frequency in the coupled signal, as well as determining whether the coupled signal exhibits pulsatile characteristics that correspond to a periodic physiological characteristic, such as blood pressure.

Abstract: Aspects of the present invention determine the resonant frequency of a sensor by obtaining sensor signals in response to three energizing signals, measuring the phase of each sensor signal, and using a group phase delay to determine the resonant frequency. The phase difference between the first and second signal is determined as a first group phase delay. The phase difference between the second and third signal is determined as a second group phase delay. The first group phase delay and second group phase delay are compared. Based on the comparison, the system may lock on the resonant frequency of the sensor or adjust a subsequent set of three energizing signals.

Abstract: A security system and method in which a base unit at a monitored premises such as a residence can, when its alarm is activated by, for example, the detection of an intrusion, fire or other emergency, establish radio communication with similar base units or compatible devices at residences within the same neighborhood and transmit voice and other audio information to alert them of the activation of the alarm.

Abstract: An electric vehicle 28, 30 power distribution system 70 is provided which allows for a vehicle operator to acquire a fully charged battery 20/24.