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US 8,913,975 B2Granted
Adaptive stepped gain amplifier system and method
AssigneeNXP B.V.
InventorsFabien Laurent Michel Deforeit, Sebastien Robert, Sebastien Amiot
Life of this patent
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Abstract
An adaptive stepped gain amplifier, for example for use in broadband receivers, has a step size which is dynamically compensated (for each received frequency) to cope with step error caused by frequency dependence of the amplifier performance.
Claims13
An RF amplifier system, comprising:
- a first amplifier having AGC control, controllable to provide one of a first set of gain steps as a target gain value;
- a second amplifier controllable to provide one of a second set of gain steps;
- a controller for controlling the gain of the first amplifier such that the amplifier system has a gain which varies on each side of the target gain value;
- a measurement unit for measuring a signal strength at an output of the system at different gain settings of the first amplifier and at different RF frequencies;
- and
- a memory for storing gain setting values derived from the measurements taken by the measurement unit for a plurality of different RF frequencies,
- wherein the controller is adapted to control the gain of the second amplifier to provide a gain step killer function during channel reception if AGC gain changes of the first amplifier are applied.
4 more elements
A method of setting the gain of an RF amplifier system, comprising:
- controlling a first amplifier having AGC control to provide one of a first set of gain steps as a target gain value;
- controlling the gain of the first amplifier to provide a series of gain steps such that the amplifier system has a gain which varies on each side of the target gain value;
- measuring a signal strength at an output of the system at different gain settings of the first amplifier and at different RF frequencies thereby to derive measured gain steps;
- storing the measured gain steps for different gain setting values derived from the measurements taken by the measurement unit for a plurality of different RF frequencies;
- controlling a gain of a second amplifier based on the stored gain steps of the first amplifier;
- and
- controlling the gain of the second amplifier to provide a gain step killer function during channel reception if AGC gain changes of the first amplifier are applied.
4 more elements
Dependencies are inferred from the claim text.