Abstract: A method and apparatus reduces the peak current drawn from a DC-to-DC voltage converter (126) in a battery powered communication device such as a radiotelephone handset (104). The radiotelephone handset (104) enters high current operating conditions during transmit time slots (208, 210) and receive time slots (212, 214) defined by a TDMA protocol. During the receive time slots (212, 214) and the transmit time slots (208, 210), operating power is removed from a portion of the communication device, such as the display (120), to reduce the peak current drawn from the voltage converter (126). Excessive current drain from the battery (124) and rapid battery discharge are thereby eliminated.

Abstract: A communication device such as a mobile station (410) for a spread spectrum communication system includes a receiver (100) having an adaptive equalizer (104) which suppresses interference on a received spread spectrum signal to produce an equalized signal (126). A pilot channel demodulator (110) demodulates the equalized signal to produce an estimate of the pilot channel (140). A summer (112) compares the pilot channel estimate and a predetermined data pattern to produce an error signal (124). A traffic channel demodulator (108) demodulates the equalized signal to produce one or more traffic channels.

Abstract: Method and apparatus for completely suppressing interference vectors in a DS-CDMA communication system (100). Receiver circuits (122, 124, 126, 128) are assigned (404, 406) to multipath from sectors both in soft handoff and not in soft handoff with the receiver. For each receiver circuit, a set of traffic channels present on the sector's signal is determined (410). For each receiver circuit, the interference is ranked (412) according to predetermined interference criteria. A set of interference vectors is selected (414) from the ranked lists of interference and an orthogonal projection is computed (416) of the receiver's desired code or Walsh code relative to the selected set of interference vectors. The receiver circuit then uses the orthogonal projection in its correlator to despread (418) received data.

Abstract: A method for system acquisition for a subscriber unit (112) in a satellite communication system (100) maximizes life of a battery (320) of a battery-powered subscriber unit. A receiver (304) of the subscriber unit is energized only when ring bursts are expected from satellites in the system, serving to minimize consumption of battery power. During just two scans, the subscriber unit acquires enough information to enable it to identify the best beam for monitoring for a ring alert and to predict the nearby beams most likely to carry a ring alert targeted for the subscriber unit. From the received information, the subscriber unit can also perform necessary processes such as passive geolocation. The subscriber unit then enters a low-power standby mode, energizing the receiver only long enough to detect the best beam to scan for a ring alert targeted for the subscriber unit.

Abstract: A searcher receiver (114) includes a sample buffer (202) which stores signal samples loaded using a real time clock. A real time linear sequence generator (RT LSG) (206) stores an initial state and is clocked using the real time clock. The contents of the RT LSG are loaded into a non-real time linear sequence generator (NRT LSG) (208) when sample processing begins. Samples are correlated using a non-real time clock to allow signal processing to be uncoupled from the chip rate. The analog front end (108) may be powered down or tuned to another frequency during non-real time processing.

Abstract: A cellular cordless telephone (10) operates with both a cordless base station (180) and a cellular base station (190) and cellular control terminal (196). In one embodiment (FIG. 2), a cellular cordless telephone (100) includes a cellular transceiver (120), antenna (128), keyboard (140), a display (180), handset (160), and microcomputer (130) together with a cordless transceiver (110) and antenna (118), all of which may be in a single housing. In another embodiment (FIG. 3), a cellular cordless telephone (200) includes a cellular telephone (220) and a cordless telephone transceiver (210) which may be a plugable module. Whenever cellular cordless telephone (10) is within range of cordless base station (180), telephone calls may be made over the cordless radio channel or transferred from the cellular radio channels to the cordless radio channel.

Abstract: A method and communication device (102) provide multimode communication with multiple autonomous communication systems including a first communication system (104) and a second communication system (106). Resources are dedicated to communication on the respective communication systems. To minimize product cost, resources are shared wherever possible between communication on respective modes. A system supervisor (304) prioritizes, schedules and controls communication between the communication device and the autonomous communication systems.

Abstract: A data processing apparatus (200) which improves the accuracy of resultant data. The data processing apparatus includes an input (220, 222) configured to receive input data. The input data includes data corresponding to an input coefficient to be multiplied by the square root of two (.sqroot.2) and input addend. The data processing apparatus further includes a first memory (202) for storing a coefficient of the square root of two, a second memory (204) for storing an addend, a summer (206, 208) which independently sums the input coefficient and the coefficient to produce a combined coefficient and sums the input addend and the addend to produce an addend sum, a multiplier (210) which multiplies the combined coefficient and an approximation of the square root of two to produce an intermediate result, and a summer (214) which sums the intermediate result and the addend sum to produce the resultant data.

Abstract: A clip (100) for surface mount termination includes a first conductor or retainer (102), a second conductor (104) and a dielectric element (106). The second conductor includes a center conductor contacting portion (144) defining a central bore (140) for receiving the center conductor (206) of a coaxial cable (202). The second conductor further includes a first flange (142) and a second flange (143) for mounting the clip to the surface (302) of a printed wiring board (300), thereby electrically terminating the cable at the printed wiring board.

Abstract: A phase detector circuit includes a first flip flop, a second flip flop, a first charge pump and a second charge pump. Outputs of the flip flops directly enable the charge pumps in response to received clocking signals. A first delay circuit delays the output signal from the first flip flop to an AND gate which combines the delayed output signal and the output signal from the second flip flop. The AND gate output is delayed in a second delay circuit to produce a delayed reset signal which resets both flip flops simultaneously and disables the charge pumps. The phase detector circuit balances the amount of charge provided to a phase locked loop near the in-phase condition to improve linearization of the phase detector.

Abstract: A voltage reference generator (200) generates a temperature compensated voltage at an output (202). The voltage reference generator includes a first transistor (204) and a second transistor (206) series connected between a supply voltage and the output. The first transistor and the second transistor establishing the temperature compensated voltage in response to a bias current (I.sub.BIAS) and a first bias voltage and a second bias voltage. The voltage reference generator further includes a current source (208) coupled to the first transistor and the second transistor to establish the bias current in the first transistor and the second transistor. The current source produces the first bias voltage and the second bias voltage.

Abstract: A radiotelephone (100) includes a main battery (101) and is operable on a first communication system. A supplemental module (102) may be attached to the radiotelephone. The supplemental module may include a second RF communication circuit for communicating with a second communication system. This allows the user to configure the radiotelephone for communication with currently available systems. The supplemental module may further include an auxiliary battery for providing extended battery operation. The radiotelephone includes a discharging and charging circuit (310) to control the discharge and charge of the auxiliary and main batteries in a way that allows uninterrupted, continuous operation of the radiotelephone.

Abstract: An electronic component assembly (102) for an electronic device (100) comprises an electronic component (140), a retainer (142), and an elastomeric connector (144). The electronic device (100) includes a housing (104, 106) and a printed circuit board (PCB) (108) having PCB throughholes (128, 130) and PCB conductive pads (200, 202). The electronic component (140) has a bottom side (146) including substantially planar conductive regions (152, 154) and electrical leads (148, 150) extending therefrom. The retainer (142) positions the elastomeric connector (144) adjacent to the substantially planar conductive pads (152, 154). Electronic component assembly (102) is placed and attached to the PCB (108) by inserting the electrical leads (148, 150) through the PCB throughholes (128, 130) and subsequently clinching the electrical leads (148, 150).

Abstract: A radiotelephone (104) in a radiotelephone system (100) enters a low power sleep mode and times the duration of the sleep mode using a sleep clock generator (205) having a coarse resolution. The radiotelephone synchronizes timing of the radiotelephone to system timing using an oscillator (116) having a fine resolution. The radiotelephone then exits the low power sleep mode synchronized with system timing.

Abstract: A method for synchronizing base stations (104, 106, 108, 110) or radio ports in a communication system (100) such as a cordless or cellular telephone system uses a mobile station (114) or handset for synchronizing unsynchronized base stations. The mobile station (114) is first synchronized to a reference base station. The mobile station (114) then initiates communication with the unsynchronized base station and calculates a synchronization adjustment. The mobile station (114) transmits the synchronization adjustment to the unsynchronized base station which uses the synchronization adjustment to adjust its time base.

Abstract: In a time division, multiple access system, a base station (102) transmits an isochronous beacon (404, 422) at the start of each frame (400), conveying control and timing information. Following the isochronous beacon (404), isochronous time slots (414, 416, 418, 420) are dynamically allocated for communication of isochronous data. After communication of the isochronous data, the remainder of the frame (400) before the next isochronous beacon (422) is used for transmission of packets of asynchronous data. This technique gives priority to the isochronous data, which is real time, while also maximizing the bandwidth allocated for asynchronous data. A single transmitter circuit (124, 158) and receiver circuit (122, 156) at each station are used for communication of both isochronous data and asynchronous data.

Abstract: An electronic device such as a radiotelephone (100) includes a bottom housing (108) defining a first hinge aperture (2207) and a slot (2208) adjacent the first hinge aperture. A top housing (102) defines a second hinge aperture (2223) having an inner rotation surface (2226). A shaft (2210) extends from the first housing at the first hinge aperture. The shaft is sized for insertion in the second hinge aperture and terminates in a bearing surface (2216), the inner rotation surface pivoting on the bearing surface as the second housing moves in relation to the first housing. The shaft and the bearing surface both define a shaft slot (2218) aligned with the slot in the first housing for routing a flexible circuit element (216) between the first housing and the second housing.