Abstract: A transceiver device (52 or 10) operates as a source of a data transmission in a communication system (50) capable of dynamically allocating spectrum for transmission of the data transmission between the transceiver device (52) and a second transceiver device (51). The transceiver device (10) includes a transmitter, a receiver coupled to the transmitter and a processor or controller (12) coupled to the transmitter and receiver. The transceiver device is programmed to monitor the spectrum (channels 1-13 of FIG. 3) to determine if a portion (channels 4-8 for example in time slot 8) of the spectrum is available. The transceiver determines what portion of the spectrum is desired for data transmission and then transmits (see time slots 11 and 13) the data transmission within a dynamically selected portion of the available spectrum.

Abstract: A transceiver device (50) acting as a master (2) among a plurality of communication devices (1 and 12) potentially acting as slaves to the master (2). The transceiver device (50) includes a transmitter (68), a receiver (54) coupled to the transmitter (68), and a processor (58) coupled to the transmitter (68) and the receiver (54). The processor (58) is programmed to poll the slaves at a first interval and then receive a communication request while polling from a first slave of the plurality of communication devices to communicate with at least a second slave of the plurality of communication devices. The master (2) then designates communication parameters for communication between the first slave and at least the second slave and then polls at a re-polling interval the first slave and at least the second slave to confirm the termination of communication between the first slave and at least the second slave.

Abstract: A dual channel receiver (100) includes a front end bandpass filter (120) that has a front end bandwidth, a first mixer (130), a second mixer (135), and two essentially identical receiver back ends (190, 195). The front end bandpass filter splits a received signal into a first signal (121) and a second signal (122) of essentially equal signal strengths and provides out of band isolation between first and second signal outputs (123, 124). The first mixer is coupled to the first signal and to a high side injection signal (131), and generates a first mixer output signal (132). The second mixer is coupled to the second signal and to a low side injection signal (136), and generates a second mixer output signal (137). Each of the two essentially identical receiver back ends is coupled to one of the first and second mixer output signals.

Abstract: A power output circuit is constructed as a distributed amplifier (21) with sufficient stages to make it practical for use as part of a transmitter, while also being integratable as part of a single-chip RF transceiver (72).

Abstract: An amplifier circuit (20) uses a series transistor (38) to couple the output of an amplifier (26) to a tuned circuit load (40) and to act as a variable resistance. In one embodiment for a multi-band receiver, multiple series transistors (38, 42) are switched for connecting different tuned circuits (40, 44) to the amplifier's output, and an activated one of the series transistors receives a gate voltage that varies its resistance so as to achieve gain control. An activated series transistors can also provide a resistance that stabilizes the amplifier (26).

Abstract: An electronic device has reduced radio frequency interference (RFI) emissions. The electronic device includes a signal generator that is coupled to a reference clock signal and a first digital circuit. The signal generator generates a random signal derived from the reference clock signal. The first digital circuit is coupled to the signal generator. The random signal governs pulse characteristics of the first digital circuit.

Abstract: A selective call receiver (100) operating from a battery (102), includes a battery monitor (114), a radio receiver (108), a regulator (104), a capacitor (105) coupled to the regulator and the radio receiver, and a processor (116) for controlling the foregoing elements. The processor is adapted to determine from the battery monitor an energy level of the battery, configure the regulator to supply a first limited current to the radio receiver and the capacitor for a first predetermined time when the energy level is above a predetermined threshold, or configure the regulator to supply a second limited current to the radio receiver and the capacitor for a second predetermined time when the energy level is at or below the predetermined threshold. After configuring the regulator, the processor is then adapted to enable the regulator to charge the capacitor and to power the radio receiver.

Abstract: A circuit (350) for detecting simulcast channel conditions includes a symbol center averaging circuit (308) for providing a center count of excursions above and below at least a first predetermined threshold and for providing a moving average of the center count over a predetermined number of symbol periods and a symbol edge averaging circuit (310) for providing an edge count of excursions above and below at least a second predetermined threshold and for providing a moving average of the edge count over a predetermined number of symbol periods. Finally, the circuit further includes a comparison circuit (360) programmed to receive and compare the moving average of the center count and the moving average of the edge count to provide a control signal (380) for simulcast detection.

Abstract: A communication system (100) that selects alternative data channels for communication has a base station (106) coupled to a plurality of alternative data communication systems (112, 114, 116) that receive messages intended for a selective call device designated by an address. A data scheduler (104), coupled to the base station (106) and the plurality of alternative data communication systems (112, 114, 116), has a categorizer (404) for categorizing the message as being suitable for transmission on an alternative data channel, a controller (402) for coordinating a list of the alternative data communication systems suitable for transmitting the message and a selector (406) for selecting the alternative data channel for transmitting the message.

Abstract: A communication device (100) having a receiver circuit (110), signal processor circuit (120), controller circuit (130), either embodied by integrated circuits or on a single integrated circuit. The transfer of signals between the circuits is timed so as to minimize the effects of noise introduced into any one of the circuits, particularly the receiver circuit (110). The center of a symbol of a received RF symbol is detected and, through hardware control or software control, the transfer of a data signal generated by the signal processor circuit (120), for example, is permitted to occur only during a period(s) of time determined to have minimal effects on the sampling of a symbol in a received signal by the receiver circuit (110).

Abstract: A receiver (100) for receiving an input signal and generating an output signal therefrom has a switchable gain circuit (104) with a stepwise variable gain control (118), a local oscillator (106) and an automatic gain control (AGC) detector (114) with a response for detecting a level of the output signal and generating an AGC signal indicative of the level of the output signal and a state machine (116) being responsive to the AGC signal generating a control signal at the stepwise variable gain control to increase or decrease a gain of the switchable gain circuit in discrete stepwise steps.

Abstract: A receiver circuit (10), and method for automatic frequency control of a receiver circuit (10) suitable for receiving a radio frequency (RF) signal, featuring determination of at least one parameter other than a frequency error of a signal which is mixed with the RF signal received by the receiver circuit; and adjusting the frequency of the signal which is mixed with the RF signal based on the frequency error if the at least one parameter satisfies a predetermined criterion.