Rf Micro Devices, Inc.

Motorola Corporation

Timothy Keith Coffman

Alexander Wayne Hietala

Joseph P Heck

Jeffery Peter Ortiz

Andrew Gerald Zocher

Michael S LaBelle

Tracy Scott Martin

A circuit and method for a saturation correction of a power amplifier (PA) is provided in order to maintain a desirable switching spectrum. The circuit includes a closed loop system that is responsive to a dynamic PA control signal known as V. The method samples a detector voltage that represents the output of the PA at the maximum voltage level of V. The sampled detector voltage is then reduced by a predetermined amount and applied as a fixed voltage PA control signal in the place of V. As a result, the closed loop system responds to the fixed voltage PA control signal to bring the PA out of saturation before Vcan begin a voltage decrease. Once the Vvoltage decreases, Vis reapplied as a dynamic PA control signal in place of the fixed voltage control signal.

Saturation correction without using saturation detection and saturation prevention for a power amplifier

A mobile terminal senses transmitted power in a Gallium Arsenide (GaAs) circuit. The GaAs circuit provides a steady reference voltage through the use of an operational amplifier and feedback circuit. The operational amplifier drives the bases of two transistors to create balanced signals that are then used by a detection circuit.

GaAs RF signal detection circuit with operational amplifier

A variable gain control circuit ( ) includes a programmable operational transconductance amplifier (OTA) circuit ( ) and a programmable conveying circuit ( ). The conveying circuit ( ) has a programmable differential circuit ( ) interconnected to a pair of programming inputs ( ). The pair of programming inputs ( ) is interconnected to a pair of programming inputs ( ) that set the gain of the OTA circuit ( ). When the OTA circuit ( ) is configured as an operational transconductance filter ( ), the programmable differential circuit ( ) can adjust the gain of the conveying circuit ( ) to compensate for changes in the input impedance of the filter ( ). The programming inputs ( ) that set the input impedance and bandwidth of the filter ( ) also control the amount of signal current transmitted by the conveying circuit ( ).

Variable gain control circuit for a receiver and method therefor

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Chandler, AZ, United States of America

Timothy Keith Coffman