33results about How to "Improve input dynamic range" patented technology

An acoustic sensor is provided according to certain aspects for non-invasively detecting physiological acoustic vibrations indicative of one or more physiological parameters of a medical patient. The sensor can include an acoustic sensing element configured to generate a first signal in response to acoustic vibrations from a medical patient. The sensor can also include front-end circuitry configured to receive an input signal that is based at least in part on the first signal and to produce an amplified signal in response to the input signal. In some embodiments, the sensor further includes a compression module in communication with the front-end circuitry and configured to compress portions of at least one of the input signal and the amplified signal according to a first compression scheme, the compressed portions corresponding to portions of the first signal having a magnitude greater than a predetermined threshold level.

An RF detector configured to provide two outputs, one being a function of the true RMS power level of an RF input signal, and the other being a function of the instantaneous / peak power of the RF input signal, normalized to the average power level. The RF detector includes a variable gain detection subsystem including a single detector or detector array that provides a representation of the power level of the RF input signal. The detector or detector array is common to both the RMS power detection channel and the instantaneous / peak power detection channel of the RF detector. A method of RF detection includes providing representations of the RF input signal at different gain levels, selecting one or more of the representations, and averaging the selected signals. The gain levels of the selected representations is adjusted to provide information about the average power level of the RF input signal.

The present invention comprises a pair of circuits (171, 172) within the first stage (100) of an AC signal pre-amplifier. The present invention reduces the current mismatch at the base of the first stage transistors (141, 142, 143, 144) resulting in faster switching times by reducing input stage offset and, hence improving input dynamic range.

The invention discloses an oximetry front-end direct-current filtering circuit applicable to a smart band. The oximetry front-end direct-current filtering circuit applicable to the smart band comprises a signal primary input end, wherein the signal primary input end is sequentially connected with a TIA (Totally Integrated Automation) circuit, a controllable bias reduction circuit, a secondary amplifying circuit, an ADC sampling circuit and a processor; a draw-off current circuit is also connected between the signal primary input end and the TIA circuit, and is connected with the processor; the processor is used for controlling the draw-off current circuit to adjust the current signal strength of the signal initial input end. The invention also discloses an adjustment method of the oximetry front-end direct-current filtering circuit applicable to the smart band, and the exposure intensity of an oximetry signal can be further improved without worrying about the saturation of the TIA circuit through adding the draw-off current circuit, so that the dynamic range of the TIA circuit is enlarged in another way. Meanwhile, by the adjustable draw-off current capacity of the draw-off current circuit and a feedback mechanism of the processor, the prime draw-off current capability can be adjusted in real time, and the oximetry front-end direct-current filtering circuit can adapt to different environments.