Skyworks Solutions, Inc.

Anadigics, Inc.

Wade C Allen

Gary Hau

Dirk Leipold

In a preferred embodiment, the gain expansion in low power mode of a single chain PA is minimized by dynamically adjusting the output impedance of the bias circuit of each gain stage for each mode of operation. Instead of switching in a series attenuator or switching in additional feedback in the first gain stage of a single-chain PA to limit the gain at the increased quiescent current level, this embodiment achieves linear performance by adjusting the quiescent current in each stage to the minimum level that meets the target gain and then increasing the output resistance of the bias circuit of each gain stage in low power mode (LPM) to provide the appropriate level of negative feedback at the base of each amplifying HBT to linearize the gain versus power response.

Dynamically configurable bias circuit for controlling gain expansion of multi-mode, single chain linear power amplifiers

Dynamically configurable bias circuit for controlling gain expansion of multi-mode single chain linear power amplifiers

A power amplifier having a driver stage and an output stage is configured to provide an amplified RF input signal. The driver stage of the power amplifier consists of one or more driver circuits consisting of a network of transistors, current sources, capacitive elements and resistive elements. An RF input signal is fed into the driver stage which is configured to provide a dynamic DC bias and an RF signal gain to a base terminal of a Bipolar Junction Transistor (BJT) power device present in the output stage. The output stage includes of a network of transistors, capacitive and resistive elements and when driven by the DC bias and the RF signal from the driver stage produces an amplified RF input signal at an output side of the output stage.

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Brookline, MA, United States of America

Wade C Allen