Motorola Corporation

Gustavo V Leizerovich

Peter J Yeh

Roger A Davenport

David H Minasi

A system and method is provided for generating a second LO signal to a second mixer of a plurality of receivers employed in a multimode communication device. A single PLO and VCO provides a high frequency second LO signal that is divided by divider components to provide a number of lower frequency second LO signals. The different high frequency second LO signal and the number of lower frequency second LO signals may be utilized for providing second LO signals for component employed in receiving communications from radio devices employing different communication standards and/or frequency ranges.

Multimode transceiver with multiple if's and common injection

A system and method for employing a training scheme to a linear amplifier system having a modulator component for modulation of a supply power of an RF power amplifier. A supply modulator is set at a maximum or peak supply voltage of the RF power amplifier that corresponds to a maximum saturation point of the RF power amplifier. A training mode is entered wherein an input signal is provided and a phase adjustment and an attenuation level for the input signal to the RF power amplifier is determined. The phase adjustment and attenuation level is employed in normal operation. A relationship between the maximum clip level and maximum supply voltage and the instantaneous voltage level of the supply that will be utilized to modulate the reference signal is employed to determine the attenuation level.

Training scheme for high efficiency amplifier

An active circuit includes an amplifying transistor (102), a voltage reference (208), and an active bias circuit. The active bias circuit controls the operating point of the amplifying transistor, and includes a bias transistor (224) which is controlled by the voltage reference and the collector current of the amplifying transistor. As the temperature of the amplifying transistor changes, the tendency of the collector current to change is counter-acted by the bias transistor and the voltage reference.

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Aventura, FL, United States of America

Gustavo V Leizerovich