Dynamic bias for RF power amplifiers
AssigneeInterDigital Technology Corporation
InventorsLeonid Kazakevich, Patrick Cabrol
Life of this patent
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Abstract
A system and method for dynamically adjusting the operating bias of an RF transmitter amplifier in response to a power control signal. The invention provides high-efficiency RF power amplification for applications where the available power source is limited. The invention uses a power control signal resident in wireless communication system architectures with a detector and voltage to current converter to arrive at a dynamic amplifier operating bias.
Claims10
A system for dynamically biasing an RF power amplifier which amplifies a communication signal, having a first signal input for receiving the communication signal, a signal output and a bias input;
- the system comprising:
- a detector, for receiving said communication signal and removing modulation components from said communication signal to provide a detector output signal;
- a second signal input for providing a TPC signal;
- a converter, coupled to said detector and said second signal input, said converter for processing said TPC signal and said detector output signal to generate a current signal;
- and
- a current mirror for receiving said current signal and feedback from said signal output and for comparing said current signal with said feedback to produce a bias signal;
- whereby said bias input receives said bias signal and dynamically adjusts the bias point of said amplifier.
A method for dynamically biasing an RF power amplifier which amplifies a communication signal, having a first signal input for receiving the communication signal, a signal output and a bias input;
- the method comprising:
- receiving said communication signal and removing modulation components from said communication signal to provide a detector output signal;
- providing a TPC signal;
- processing said TPC signal and said detector output signal to generate a current signal;
- receiving said current signal and feedback from the output of said RF power amplifier and comparing said current signal with said feedback to produce a bias signal;
- and
- dynamically adjusting the bias point of said amplifier using said bias signal.
Dependencies are inferred from the claim text.