Analog Devices,inc.

Roxann Blanchard

Robert J McMorrow

Moshe Gerstenhaber

Sukhjinder S Deo

A radio frequency output power control system is disclosed for use in communication systems that use a modulation scheme having a non-constant amplitude envelope. The system includes a power amplifier having a radio frequency input node for receiving a radio frequency input signal, a power control node for receiving a filtered power control signal, and an output for providing an amplified output signal. The system also includes a variable filter that receives a power control signal at a power control input and a receives a trigger signal at a trigger input, and provides a filtered power control signal to the power control node of the power amplifier responsive to the power control signal and the trigger signal.

Variable filter systems and methods for enhanced data rate communication systems

A bias circuit is disclosed for use in a temperature compensation system. The bias circuit provides a current that is proportional to a temperature variation raised to an nth power where |n|&#x3e;1 in accordance with an embodiment. In further embodiments, the bias circuit includes a PTAT current source for providing to a driver-stage amplifier a current that is substantially proportional to absolute temperature, and a CTAT current source for providing a current that is complementary to absolute temperature, wherein the PTAT and CTAT current sources coact to provide a PTATreference current that is proportional to an absolute temperature variation to the nth power wherein |n|&#x3e;1.

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Bedford, MA, United States of America

Roxann Blanchard