Abstract:
A transmission line device (200) employs a first ground plane (118) that is disposed on a first dielectric substrate (202). A first conductive layer (210) that encloses a first area (213) is disposed on a second dielectric substrate (206), which substrate is positioned substantially adjacent to the first dielectric substrate (202). A second conductive layer (211) that encloses an area corresponding to the first area (213) is disposed on a third dielectric substrate (207), which substrate is positioned substantially adjacent to the second dielectric substrate (206). A coil structure is thereby provided that can be employed in the fabrication of a transmission line device, according to the invention.
Abstract:
A wireless communication system for simultaneously communicating overlapping wideband and narrowband signals. The system includes a transmitting station for embedding one or more narrowband signals (3-5) in a wideband signal (1) having a frequency spectrum encompassing the narrowband signals, and transmitting the resulting composite wideband signal (2). The system also includes a receiving station for receiving a composite wideband signal (60) and separating the embedded narrowband signal(s) (62, 63) from the wideband signal (61). In one embodiment, a cellular radiotelephone base station (35) is operable as both the transmitting and receiving station, communicating with remote subscriber units (29-31) havng conventional transceivers (FDMA, TDMA and/or CDMA). The base station transmitter circuitry (10-17) includes FM and CDMA signal generators (10, 12), a combiner (15) for embedding the narrowband signal (3-5) in the wideband signal (1), and an AGC (14) and power detectors (11, 13) for controlling the narrowband signal power. The receiving circuitry includes a CDMA processing circuit having an FFT circuit (41), a threshold detector (42), a notch filter (43), and an inverse FFT circuit (44) for separating narrowband signals (62, 63) from the CDMA signal (61).
Abstract:
A battery charger (100) with an improved wide band, constant current source (10) with improved dynamic range is provided. The wide band constant current source (10) with improved dynamic range may include a current source (22), a voltage reference amplifier (50), a current control network (70) and overcurrent control circuit (80).
Abstract:
A battery charger for lithium ion cells closely monitors cell voltage, and charge time, so as to avoid the over-application of charge to the cell. Charge pulses (104) are followed by a first rest (110), a discharge (112) and a second rest (120) period prior to re-initiating the charge pulse. If the battery voltage reaches a pre-selected maximum, in less than a pre-selected period of time, the charge pulse is reduced by a pre-selected minimum factor. Cycling of the cell is continued until the cells are fully charged.
Abstract:
A process for joining at least two ultrathin plastic pieces (12, 14) by an ultrasonic welding method is disclosed. The process includes providing a plurality of energy directors (20, 22) for enhancing weld strength, and reducing unacceptable welds. The process also includes providing a groove (42) in a flange attachment member (15) to assist in properly orienting the pieces (12, 14) to be joined.
Abstract:
The power of a first signal is measured and is compared with a threshold (33). If the first signal power meets a handoff threshold, the system enters the handoff procedure (53). Once in the handoff procedure, estimates of a first signal quality a signal would have, if transmitted from the first site to the subscriber, and a second signal quality a signal should have, if transmitted from the second site to the subscriber, are determined (54). If the estimated first signal quality meets a transmit threshold, the first will activate a traffic signal to the subscriber (56). If the estimated first or second signal quality fails to meet the transmit threshold, the first or second, respectively, will terminate its traffic signal to the subscriber, but the transmission resources will remain dedicated to the subscriber (60). If the estimated first or second signal quality fails to meet the handoff threshold, the first or second, respectively, will discontinue serving the subscriber (61).
Abstract:
A battery assembly (10) includes at least one battery cell (12) and a circuit carrier (15) in thermal proximity to the at least one battery cell (12). Located on circuit carrier (15) is a thermal fuse (18) which is formed from an electrically conductive resilient material such as beryllium copper. At least one end of the thermal fuse is coupled in a deflected state to a solder pad (20) located on circuit carrier (15) using a low temperature conductive adhesive such as low temperature solder (24). When the temperature of the at least one battery cell (12) reaches a predetermined trip point, the one end of the thermal fuse releases away from solder pad (20) due to the heat transfer from the at least one battery cell, thereby electrically disconnecting the at least one battery cell (12) from battery terminal (23).
Abstract:
A method and apparatus is provided for use in a radio communication system having a first and second base site communication unit (116, 118) operatively coupled to a first and second transcoder (106, 108), respectively. This system also includes a mobile communication unit which is requesting to enter a linked-communication mode with the first and second base site units. In order to perform a linked-communication, a transcoder-base site interface link is established between the second base site and the second transcoder. In addition, the second transcoder is configured to operate in a bypass mode such that it relays information within the transcoder-base site interface link through a communication across regional entity (CARE)-Link in conjunction with a CARE-Control-Link between the first and second transcoder. Finally, the first transcoder is configured to operate in linked-communication mode by relaying information within the CARE-Link which is controlled by the CARE-Control-Link.
Abstract:
A coherent reverse channel (120) a per-chip spreading function, orthogonal spreading functions and a time alignment of all traffic channels are implemented such that the main signal of each channel arrives at a base station within a fraction of a chip of one another in accordance with the invention. With this, the orthogonality among all channels is maintained, and, when demodulated, all channels except the channel of interest provides a cross correlation of substantially zero with respect to the remaining signals.
Abstract:
A double-sided oscillator package and method of coupling components thereto. A package (100) having an open-top receptacle (112) adapted to receive electronic components (126, 128, 130) and an open-bottom receptacle (114) adapted to receive a piezoelectric element (134) and a cover (116) for hermetically sealing the open-bottom receptacle (114). The electronic components (126, 128, 130) and piezoelectric element (134) are electrically connected. A hermetic environment (118) is established by coupling the cover (116) and open-bottom receptacle (114).