Anadigics, Inc.

Intersil Americas Inc.

Renesas Electronics America Inc.

Julio Reyes

Robert H Isham

Andrew Lawrence Webb

Thomas J Hayes

Joel Lott

David Osika

Current sensing with RDScorrection is disclosed. In an embodiment, a method comprises: measuring an approximate temperature of a MOS transistor switch by a temperature sensor to yield a measured temperature; calculating a corrected temperature from the measured temperature using a stored temperature sensor gain and offset correction function; measuring a gate drive voltage for the MOS transistor; calculating a voltage correction factor using a stored voltage correction function, wherein the stored voltage correction function is a function of the corrected temperature and the gate drive voltage; measuring a RDSvoltage drop across the MOS transistor switch to yield a measured RDSvoltage drop; and calculating the current using the measured RDSdrop and the voltage correction factor.

[object Object]

A protection circuit for a power amplifier connected as a negative feedback loop around the power amplifier. The negative feedback loop comprises a detector circuit, a driver circuit and an attenuator circuit. The detector circuit receives output voltage from the power amplifier and generates a signal when the output voltage exceeds a predefined threshold. The driver circuit filters the signal received from the detector circuit to maintain feedback loop stability and adjusts the feedback loop bandwidth and gain to provide a filtered signal. The attenuator circuit receives the filtered signal and attenuates the input voltage of the power amplifier to reduce the output voltage of the power amplifier to a level below the predefined threshold.

Power amplifier protection circuit

A method and circuit system for improving power efficiency of RF power amplifiers is disclosed. A preferred embodiment comprises a power amplifier comprising: a plurality of amplifier stages, a power regulator providing an output supply voltage at an output node responsive to an adjustable power control signal, wherein the output supply voltage is applied to at least one stage of a power amplifier; and an amplifier biaser providing a bias signal corresponding to the adjustable power control signal, wherein the output supply voltage and the bias signal are independently generated as functions of the adjustable power control signal.

System and method for improving power efficiency in GSM power amplifiers

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Leonia, NJ, United States of America

Julio Reyes