Abstract: In an example, an acoustically powered sensor unit for obtaining sensor data indicative of flight characteristics of an aircraft is described. The acoustically powered sensor unit includes a housing having a first portion comprising a diaphragm and a second portion coupled to an exterior of an aircraft and. The diaphragm is configured to receive acoustic energy from an engine of the aircraft. The acoustically powered sensor unit further includes a voice coil actuator disposed within the housing and coupled to the diaphragm. The voice coil actuator is configured to receive kinetic energy by way of a vibration of the diaphragm and responsively generate an electrical power signal. The acoustically powered sensor unit further includes one or more sensors disposed within the housing and powered using energy from the electrical power signal. The one or more sensors are configured to obtain the sensor data indicative of flight characteristics of the aircraft.

Abstract: In an example, an acoustically powered sensor unit for obtaining sensor data indicative of flight characteristics of an aircraft is described. The acoustically powered sensor unit includes a housing having a first portion comprising a diaphragm and a second portion coupled to an exterior of an aircraft and. The diaphragm is configured to receive acoustic energy from an engine of the aircraft. The acoustically powered sensor unit further includes a voice coil actuator disposed within the housing and coupled to the diaphragm. The voice coil actuator is configured to receive kinetic energy by way of a vibration of the diaphragm and responsively generate an electrical power signal. The acoustically powered sensor unit further includes one or more sensors disposed within the housing and powered using energy from the electrical power signal. The one or more sensors are configured to obtain the sensor data indicative of flight characteristics of the aircraft.

Abstract: DC power savings in a mobile communication device can be achieved by dynamically adjusting the biasing for a receiver based on the communication link quality. The output signal levels of at least one low noise amplifier (LNA) are monitored to identify the DC operating conditions for the LNA. Closed loop control of the DC biasing is adjusted based on a comparison between the monitored DC operating conditions and a reference signal. The output of the LNA is also coupled to a radio receiver section that is configured (e.g., SW or HW) to evaluate the link quality based on various criteria such as inter-modulation distortion, noise, interference, fading, etc. The reference signal that is used to control the DC biasing of the LNA is adjusted (periodically, continuously, or on demand) in response to the evaluated link quality. The dynamic biasing yields acceptable signal reception with low DC power consumption.

Abstract: A radio frequency circuit is generated as an integrated circuit that is arranged to provide transmission, receipt, and storage of data. The data is transmitted and received across a radio frequency band. An antenna is included within the integrated circuit, wherein the antenna is manufactured at the time the integrated circuit is manufactured. A power source is mounted adjacent to the integrated circuit. The integrated circuit and the power source are encapsulated within the same integrated circuit package.

Abstract: An electronic device such as watch adapted for wireless communication, the electronic device using a dipole antenna, the dipole antenna having two component parts, each of which being disposed in respective parts of a two-part connecting band, such as a watchband of the electronic device.

Abstract: A wireless body sensor device includes a number of small probes that are arranged about a wireless electronics system. The wireless electronics system can process bio-potential signals from the probes and communicate bio-potential data to another device such as a wireless telephone, wrist watch, personal data assistant (PDA), laptop computer or any other appropriate device. By forming the probes within a confined short range of the wireless electronics system, interference and noise is greatly reduced. The wireless electronics system includes signal amplifiers that increase the signal levels associated with the bio-potential probes so that the signals can be converted to bio-potential data through an analog-to-digital conversion (ADC) process. Once the bio-potential data is in digital form, the data can be processed by a digital signal processor (DSP), encoded into a signal transmission, and communicated to another device with a radio system and its corresponding antenna.

Abstract: A self-powered radio integrated circuit (IC) includes a radio IC node and an embedded antenna within a single IC package that is configurable for the transmission, receipt, and storage of data. The data is transmitted and received across a radio frequency band. A power source is mounted adjacent to the integrated circuit. The integrated circuit and the power source are included on the same chip carrier for inclusion in other systems.

Abstract: A system (100) and method (200) for adaptively managing bias of an RF power amplifier (102) is provided. The system (100) incorporates a controller (116) configured to select a radio operating mode. A current-mirror circuit (114) is coupled to the controller (116) and configured to produce a reference current (IRef) as a function of the radio operating mode. A bias regulator (104) is coupled to the controller (116) and the current-mirror circuit (114) and configured to produce a driver-stage bias current (Ib1) and an output-stage bias current (Ib2) for the power amplifier (102) in response to the reference current (IRef). The system (100) also incorporates a DC-to-DC converter (118) coupled to the controller (116) and configured to provide a supply voltage (Vcc) for the power amplifier (102) in response to the radio operating mode. The system (100) also incorporates an envelope detector (120) configured to produce an envelope current (IEnv) in response to an RF input signal (126).

Abstract: An apparatus for correcting deviations in image linewidth in a image projection system having a laser and a liquid crystal cell wherein images are made on the liquid crystal cell by impinging the laser on said cell. The apparatus also has apparatus for creating a test image having a plurality of lines of specific width on a liquid crystal cell and calculating the difference between the linewidth of the plurality of lines of said test image as created and as expected. Furthermore, apparatus are provided for modifying the period of the laser light based on said differences in linewidth between the plurality of lines (as created and as expected) to correct deviations in image linewidth, whereby deviations in image linewidth are substantially eliminated.

Abstract: A broadband, inductively coupled, duplex, radio frequency (RF) transmission system for communcating between a central unit (10) and a plurality of remote units (31) is disclosed. The central unit (10) includes an RF signal source (11) and an RF receiver (21) connected to one end of a balanced transmission line (25) via a signal splitter (15) and a transmission line impedance matching network (27). Each remote unit (31) includes a receiving section (33) and a transmitting section (35) separate from one another. Each receiving section (33) and each transmitting section (35) includes U-shaped couplers (37,43) positioned so as to overlie the balanced transmission line (25). The U-shaped couplers (37,43) are oriented such that the cross-members of the U-shaped couplers (37,43) lie orthogonal to the balanced transmission line (25) and the legs of the U-shaped couplers (37,43) lie parallel to the balanced transmission line (25).

Abstract: An apparatus for correcting deviations in image linewidth in a image projection system having a laser and a liquid crystal cell wherein images are made on the liquid cyrstal cell by impinging the laser on said cell. The apparatus also has apparatus for creating a test image having a plurality of lines of specific width on a liquid crystal cell and calculating the difference between the linewidth of the plurality of lines of said test image as created and as expected. Furthermore, apparatus are provided for modifying the period of the laser light based on said difference in linewidth between the plurality of lines (as created and as expected) to correct deviations in image linewidth, whereby deviations in image linewidth are substantially eliminated.

Abstract: A resonant, quasi-square wave, pulse width modulated (PWM) power source (33) for a connectorless power system is disclosed. The power source (33) supplies constant amplitude, fixed-frequency current to a supply loop (31) that is inductively coupled to a plurality of pickup loops (35), each of which supplies power to a remote unit, such as the seat regulator that supplies power to a group of commercial airplane seats (37). Precise, fixed-frequency control is provided by triggering a PWM with fixed-frequency sync pulses. Current control is provided by sensing the current applied to the supply loop, converting the magnitude of the sensed current to a voltage and using the voltage to control the width of the pulses produced by the PWM. The PWM pulses, in turn, control the width of the power pulses applied by the power source (33) to the supply loop (31). Stability and efficiency are improved by maintaining the output of the power source nearly resonant, i.e.

Abstract: A regulator circuit for use with a connectorless power supply system in which power is inductively supplied to a plurality of remote loads. A sinusoidal current, at a frequency of 38 kHz, is provided by a power distribution system (10), and circulates through a supply loop (68), which is disposed under the floor of an aircraft cabin. Three parallel connected capacitors (78, 80, and 82) and a multi-turn coil (70) that is inductively coupled to the supply loop comprise a resonant tank circuit in which current circulates. The voltage developed across the tank circuit is half wave rectified, filtered, and supplied to a load connected circuit. An op-amp (134) compares the potential across the load to a regulated voltage. The output of the op-amp is used to control the period of time during which an N channel FET (96) shunts current to regulate the output voltage.