Dynamic bias for RF power amplifiers
AssigneeInterDigital Technology Corporation
InventorsLeonid Kazakevich, Patrick Cabrol
Life of this patent
Estimating the term…
Abstract
A subscriber unit and method for wireless communication that dynamically adjusts RF amplifier operating bias for the subscriber unit's transmitter 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 subscriber unit that receives data and a transmit power control (TPC) signal over a wireless communication downlink signal, comprising:
- an RF power amplifier (12) with a bias point for amplifying the communication signal to produce an RF output signal;
- a detector (14), for receiving said communication signal and removing modulation components from said communication signal to provide a detector output signal;
- a converter (16), coupled to said detector, configured to process said TPC signal and said detector output signal to generate a current signal;
- and
- a current mirror (18) for receiving said current signal and a feedback from said RF output signal and for comparing said current signal with said feedback to produce a bias signal;
- whereby said bias point of the RF amplifier is dynamically adjusted responsive to said bias signal.
In a subscriber unit that receives data over a wireless communication downlink signal and a transmit power control (TPC) signal, a method for dynamically adjusting the operating bias of an RF power amplifier that amplifies a communication signal for transmission by the subscriber unit, the method comprising:
- receiving said communication signal and said TPC signal;
- removing modulation components from said communication signal to produce a dc voltage signal;
- processing said TPC signal and said dc voltage signal to generate a current signal;
- comparing said current signal with a feedback from the output of said RF power amplifier to produce a bias signal;
- and
- dynamically adjusting the operating bias of said RF amplifier using said bias signal.
Dependencies are inferred from the claim text.