Abstract: Gated physiological monitoring systems and methods are described that utilize a photoplethysmogram (PPG) monitoring device and another (different) physiological monitoring device, where the PPG monitoring device is operated based on timing information obtained from the other physiological monitoring device. In some implementations, control circuitry can be configured to operate the PPG monitoring device based on timing information from a physiological waveform detected by the physiological monitoring device. For example, the control circuitry can operate the PPG monitoring device to capture one or more selected portions of a measured PPG waveform that can then be used to estimate the full PPG waveform or portions of interest.

Abstract: A switched capacitor circuit includes a threshold detector to generate a threshold detection signal when a difference between first and second input signals crosses a predetermined level. A variable current source produces a varying amount of current in response to the difference between the input signals. A voltage measurement means produce a measurement signal in response to the difference between the input signals. A correction means produces a correction signal in response to the measurement signal to produce an optimum coarse phase overshoot. A timing comparison means produces a timing signal in response to the difference between the input signals. A correction means produces a correction signal in response to the timing signal to produce an optimum coarse phase overshoot.

Abstract: Various embodiments of the invention allow for error calibration in analog-to-digital converters (ADCs) having multiple cascaded ADC stages. The ADC stages exchange information that is utilized in the calibration process. Various embodiments allow for calibration of one stage by utilizing a feedback signal from at least one subsequent stage. Certain embodiments of the invention increase the speed of the calibration process by utilizing coarse and fine sub-ADCs.

Abstract: A switched capacitor circuit includes a threshold detector to generate a threshold detection signal when a difference between first and second input signals crosses a predetermined level. A variable current source produces a varying amount of current in response to the difference between the input signals. A voltage measurement means produce a measurement signal in response to the difference between the input signals. A correction means produces a correction signal in response to the measurement signal to produce an optimum coarse phase overshoot. A timing comparison means produces a timing signal in response to the difference between the input signals. A correction means produces a correction signal in response to the timing signal to produce an optimum coarse phase overshoot.

Abstract: The present invention relates to an implantable microfabricated sensor device and system for measuring a physiologic parameter of interest within a patient. The implantable device is micro electromechanical system (MEMS) device and includes a substrate having an integrated inductor and at least one sensor formed thereon. A plurality of conductive paths electrically connect the integrated inductor with the sensor. Cooperatively, the integrated inductor, sensor and conductive paths defining an LC tank resonator.

Abstract: The present invention relates to an implantable microfabricated sensor device and system for measuring a physiologic parameter of interest within a patient. The implantable device is micro electromechanical system (MEMS) device and includes a substrate having an integrated inductor and at least one sensor formed thereon. A plurality of conductive paths electrically connect the integrated inductor with the sensor. Cooperatively, the integrated inductor, sensor and conductive paths defining an LC tank resonator.