摘要:
The invention provides a system for evaluating a patient featuring: 1) an ECG-measuring system connected to the patient and configured to sense ECG information from the patient; 2) a data-acquisition system interfaced to a vital sign-monitoring system configured to sense vital sign information from the patient during an electro-physiology (EP) procedure; and 3) an external software system interfaced to both systems. The external software system includes a first software interface that receives ECG information measured from the patient by the ECG-measuring system, and a second software interface that receives vital sign and EP-related information from the data-acquisition system measured from the patient during an EP procedure. A database stores physiological and EP-related information measured from the patient before, during, and after the EP procedure. And an algorithm interfaced with the database determines an efficacy of the EP procedure by collectively analyzing information measured during each of these phases.
摘要:
Systems and methods using the same to achieve a tri-level multi-bit delta-sigma DAC having reduced power consumption and voltage droop have been achieved. A new rotation-based first order noise-shaping Dynamic Element Matcher (DEM) technique for use with 3-level unit elements have been disclosed. Reduced reference loading has been achieved when the tri-level DEM scheme is applied to switched capacitor implementations in particular. Furthermore a differential switched-capacitor DAC implementation, which enables use of the DEM technique is disclosed. The invention allows reduced circuit complexity required to implement a N-bit DAC when constructed using 3-level unit elements.
摘要:
A variable gain analog amplifier is described that uses pulse-density modulation in the form of a sigma-delta modulator (SDM) to produce a gain by modulating the selection of a switch that selects the amount of resistance in a negative feedback loop of the amplifier. The output of the SDM is dithered to increase the gain resolution of the analog amplifier, wherein the increased resolution produces a quiet, inaudible transition between changes in gain setting at an output of the variable gain amplifier and in addition produces a quiet, inaudible mixing and merging of audio signals.
摘要:
Communication processing paths include distortions, such as DC offset in the baseband analog path which needs to be accounted for. The use of a digital-to-analog converter (DAC) to inject a DC offset cancellation signal can bring about noise/area/power advantages. The DAC is driven by a mixed signal low pass filter loop. However, the DAC could also be driven in an open loop system, or a combination of open and closed loop. A low noise sign and magnitude DAC with low area and power requirements is implemented using selectively connected programmable current sources to virtual earth input terminals on a transimpedance amplifier (TIA) op-amp circuit. The constant virtual earth voltage eliminates linearity problems that would otherwise exist due to the finite current source output impedance. Current sources are only switched in when required so unneeded sources are out of circuit and do not contribute noise or use any power.
摘要:
Communication processing paths include distortions, such as DC offset in the baseband analog path which needs to be accounted for. The use of a digital-to-analog converter (DAC) to inject a DC offset cancellation signal can bring about noise/area/power advantages. The DAC is driven by a mixed signal low pass filter loop. However, the DAC could also be driven in an open loop system, or a combination of open and closed loop. A low noise sign and magnitude DAC with low area and power requirements is implemented using selectively connected programmable current sources to virtual earth input terminals on a transimpedance amplifier (TIA) op-amp circuit. The constant virtual earth voltage eliminates linearity problems that would otherwise exist due to the finite current source output impedance. Current sources are only switched in when required so unneeded sources are out of circuit and do not contribute noise or use any power.
摘要:
An integrated circuit, including at least two integrated circuit portions mutually spaced on a single electrically insulating die and at least one coupling region on the die to provide capacitive coupling between the otherwise mutually isolated integrated circuit portions, the integrated circuit portions being formed by a plurality of layers on the single die, the layers including metal and dielectric layers and at least one semiconductor layer; wherein at least one of the dielectric layers extends from the integrated circuit portions across the coupling region and at least a corresponding one of the metal layers and/or at least one semiconductor layer extends from each of the integrated circuit portions and partially across the coupling region to form capacitors therein and thereby provide the capacitive coupling between the integrated circuit portions.
摘要:
Systems and methods to achieve an IC audio volume control requiring minimum silicon area and having an accurate volume control gain setting are disclosed. A resistive element in form of a R/2R ladder is deployed between an output node of an operational amplifier and an input node of the circuit. All resistors of said resistive element are unit resistors having a same resistance, wherein said unit resistors are arranged in parallel or series combinations to achieve a resistance desired. A first number of switches are deployed between nodes of the R/2R ladder and an inverting input of the operational amplifier. Furthermore a second number of switches are deployed between nodes within resistor units of the R/2R ladder and the inverting input. The circuit invented could have a single input or a differential input, or a single ended output or a differential output.
摘要:
An integrated circuit, including at least two integrated circuit portions mutually spaced on a single electrically insulating die and at least one coupling region on the die to provide capacitive coupling between the otherwise mutually isolated integrated circuit portions, the integrated circuit portions being formed by a plurality of layers on the single die, the layers including metal and dielectric layers and at least one semiconductor layer; wherein at least one of the dielectric layers extends from the integrated circuit portions across the coupling region and at least a corresponding one of the metal layers and/or at least one semiconductor layer extends from each of the integrated circuit portions and partially across the coupling region to form capacitors therein and thereby provide the capacitive coupling between the integrated circuit portions.
摘要:
Systems and methods using the same to achieve a tri-level multi-bit delta-sigma DAC having reduced power consumption and voltage droop have been achieved. A new rotation-based first order noise-shaping Dynamic Element Matcher (DEM) technique for use with 3-level unit elements have been disclosed. Reduced reference loading has been achieved when the tri-level DEM scheme is applied to switched capacitor implementations in particular. Furthermore a differential switched-capacitor DAC implementation, which enables use of the DEM technique is disclosed. The invention allows reduced circuit complexity required to implement a N-bit DAC when constructed using 3-level unit elements.
摘要:
The present invention relates to locating a person who is operating a wireless communications device in an indoor environment. In particular, it relates to processing various combinations of RSSI, direction of arrival and flight time characteristics of a signal, as received at two or more and preferably three or more access points. In one embodiment, the access points implement a wireless LAN (WLAN) and the communications device is a telephone operating over the WLAN. In another embodiment, the localization of a wireless device allows a system to reject users who are outside a predefined physical area.