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US 2011/0068873 A1Published application
RF Power Amplifiers with Linearization
AssigneeRayspan Corporation
InventorsRaul Alidio, Alexandre Dupuy, Ajay Gummalla, Woo Yong Lee, Maha Achour
Life of this patent
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Abstract
Designs and techniques associated with power amplifiers for amplifying RF signals to provide variable power amplification and improved linearity in various RF amplification circuits, including power amplifiers operated under the power back-off conditions.
Claims49
1-37. (canceled)
A variable power amplifier, comprising:
- a plurality of cells, each cell having at least one bank of transistors;
- and
- a control circuit for turning on and off the plurality of cells so as to adjust an output power level of the variable power amplifier to maintain linear operation of the variable power amplifier.
The variable power amplifier as in claim 8, wherein the variable power amplifier has a distributed power amplifier structure, further comprising:
- an input port to receive an RF signal for power amplification;
- and
- an output port to output an amplified RF signal, wherein the plurality of cells are coupled in parallel between the input port and the output port.
A method for a variable power amplifier, comprising:
- detecting an input signal at an input port of a variable power amplifier;
- determining a feedback signal to adjust an output power level of the variable power amplifier to maintain linear operation;
- generating a feedback signal in response to detection of the input signal;
- and
- turning on at least one cell of the variable power amplifier in response to the feedback signal, the cell having switchable transistor banks.
2 more elements
A system, comprising:
- an input port to receive an analog signal;
- switchable transistor banks to amplify the analog signal;
- a control circuit coupled to the input port, wherein the control circuit generates a feedback control signal for the amplifier in response to a received analog signal;
- and
- a bias control circuit coupled to the amplifier to selectively turn on the switchable transistor banks in response to the feedback control signal.
2 more elements
Dependencies are inferred from the claim text.