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 selective call receiver (100) includes a radio frequency amplifier (202) having an output power level that is controllable. A radio frequency level sensor (500) generates a sensor output signal in response to an input signal level received at the radio frequency amplifier (202). The receiver also includes a RSSI signal (208) that indicates a relative strength of an on-channel signal received at the radio frequency amplifier and recovered by the selective call receiver.

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.

Abstract: An electronic driver for use with linear and non-linear transducers includes a voltage controlled oscillator (1630) to generate an output signal (1603) in response to a frequency control signal (1625); a transducer driver (1604), coupled to the voltage controlled oscillator (1630) and to the transducer (600), includes an electromagnetic driver (604) to generate an electromagnetic field in response to the output signal (1603), and a power control circuit (2104, 2106) to suspend generation of the electromagnetic field for a portion of the output signal, the electromagnetic field generating movement of a magnetic motional mass (636) which is transformed into tactile energy; and a tactile energy monitor (1606) coupled to the electromagnetic driver (604) for monitoring a level of tactile energy generated by the movement of the magnetic motional mass (636), and in response thereto generates the frequency control signal (1625) to maximize the level of tactile energy generated.