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Effective-inductance-change based magnetic particle sensing
(2015)The invention relates to an integrated measurement system to detect a quantity of magnetic particles in a sample. The measurement system includes a substrate. An electromagnetic (EM) structure disposed on the surface of the substrate is configured to receive a sample including the magnetic particles in proximity thereof. The integrated measurement system also includes an electrical current generator disposed on the surface of the substrate ...Patent -
Methods and apparatus for reducing high-frequency events in polar domain signals
(2012)Methods and apparatus for reducing high-frequency events in polar domain signals. An exemplary method includes first generating an unmodified rectangular-coordinate signal having in-phase (I) and quadrature phase (Q) components that are modulated according to a predetermined modulation scheme. Next a first sample of the unmodified rectangular-coordinate signal is modified based on how close the first sample is to the origin in the complex ...Patent -
Method and apparatus for providing high efficiency cartesian modulation
(2012)The disclosure relates to a method and apparatus for providing efficient signal transmission. Conventional linear amplifiers are most efficient when operated in compressed mode. In the compressed mode, the digital power amplifier switches between the on and off modes. A digital power amplifier operates in compressed mode only if the incoming signal is an on-off constant envelop signal. In one embodiment, the disclosure provides a method ...Patent -
Electronic self-healing methods for radio-frequency receivers
(2012)Systems and methods for providing self-healing integrated circuits. The method is characterized in that the behavior of a circuit or a device in response to an input signal is observed. One or more operational parameters or characteristics of the circuit or the device are derived. A corrective action to bring the operational parameters or characteristics of the circuit or device within a desired range is deduced, if needed. The corrective ...Patent -
Cell-based sensing systems and methods
(2012)The present disclosure describes cell-based sensors. Cell-based sensors can comprise cells coupled with a sensor for sensing change of configuration and/or movement of the cells. Such changes of configuration and/or movement of the cells can be sensed through changes to one or more parameters such as electrical, mechanical and/or optical parameters. By way of example, the sensors can be magnetic based sensors or electrochemical sensors.Patent -
Broadband phase synthesis network with self-healing capability
(2013)A phase synthesis network having self healing capability. The phase synthesis network includes two phase rotators that receive I and Q input LO signals, that receive a digital control signal, and that can adjust a phase and a gain in response to the digital control signal. An output of each of the phase rotators provides a respective output signal to a switch. The switch provides a selected one of the respective output signals for mixing ...Patent -
Posture detector calibration and use
(2013)Calibrating a posture detector for a patient's body involves measuring outputs of one or more sensors disposed in relation to the patient's body while the patient assumes a plurality of positions. A transfer matrix is formed having coefficients corresponding to the measured outputs. The transfer matrix defines a relationship between a coordinate system of the one or more sensors and a coordinate system of the patient's body. The body ...Patent -
High-efficiency all-digital transmitter
(2013)A low cost high-efficiency all-digital transmitter using all-digital power amplifiers (“DPA”) and various mapping techniques to generate an output signal, which substantially reproduces a baseband signal at a carrier frequency. A baseband signal generator generates a baseband signal which is quantized by a signal processor using a quantization map. A DPA control mapper outputs control signals to phase selectors using the quantized signal ...Patent -
Noise suppression techniques in high precision long-term frequency/timing measurements
(2013)A frequency/timing measurement apparatus includes a reference source having a reference source output terminal. At least one target source has a target source output terminal. The at least one target source is communicatively coupled to the reference source. A frequency timing measurement block has a first input terminal electrically coupled to the reference source output terminal. A second input terminal is electrically coupled to the ...Patent -
Methods and apparatus for reducing average-to-minimum power ratio in communications signals
(2013)A baseband circuit for a communications transmitter includes a baseband modulator, a pulse-shaping filter, and an AMPR reduction circuit. The baseband modulator is configured to generate a sequence of symbols formatted in accordance with a non-constant envelope modulation scheme. The pulse-shaping filter is configured to band-limit the sequence of samples to provide a sequence of samples. The AMPR reduction circuit is configured to analyze ...Patent