Adaptive stepped gain amplifier system and method

摘要

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.

主权项

1. 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.