Motorola Corporation

John S Ruppel

Ronald L Porco

Joseph L Clark

Henry Hoang Nguyen

Leroy Albert Plymale, Sr

Thomas L Sears

Armando Vera Jimenez

Dale Robert Anderson

Thomas F Shirley, Jr

Thomas J Zuiss

Gregory A Edgar

Jeffrey A Battin

Jeff Klingberg

In the present technique for power management of a power amplifier, an amplifier bank from a plurality of amplifier banks in a power amplifier that has been switched off for a longest period of time is assessed () to provide a lowest amplifier bank. With this lowest amplifier bank, an up-threshold that is associated to the lowest amplifier bank is assessed (), followed by another assessment () of a current power output of the power amplifier. It is next determined () whether the current power output corresponds at least in a predetermined way to the up-threshold, and if so, the lowest amplifier bank is accordingly switched on ().

Methods and apparatus of managing a power amplifier

In the present technique for power management of a power amplifier, it is first determined () whether a counter value corresponds at least in a predetermined way to a counter threshold, and if so, a current status of at least one amplifier bank from a plurality of amplifier banks in a power amplifier is switched ().

A power amplifier circuit (10) utilizes a step-wise variable voltage source (22) to improve amplifier (14) operating efficiency. In one preferred embodiment, an input signal to the step-wise variable voltage source is obtained by observing an operating characteristic of the amplifier. In an alternate preferred embodiment of the present invention, a characteristic of the input signal driving the amplifier stage is used to form an input signal to the step-wise variable input voltage source.

Power amplifier with variable input voltage source

A method is provided of attenuating a signal value within erroneous frames of a logarithmically coded digital signal. The method includes the steps of detecting an erroneous frame of the logarithmically coded digital signal and adding an attenuation value to a frame exponent of the erroneous frame.

Simplified method of attenuation of logarithmically coded digital signals

A programming station for aligning two-way radios. The station allows alignment of various radio control functions through use of a menu driven format. A relative value display is provided for many of the alterable values.

Radio alignment/programming device

An IF system that makes satisfactory use of a first IF stage frequency selected from between 108 MHz and 132 MHz to thereby provide an IF system that can be utilized in radios intended for reception in all land mobile frequency bands. The first IF stage (17) includes a high tolerance crystal filter (24) that contributes to the satisfactory reception performance of a radio so equipped.

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Keller, TX, United States of America

John S Ruppel