Intermodulation performance enhancement by dynamically controlli

Telecommunications – Transmitter and receiver at separate stations – Distortion – noise – or other interference prevention,...

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Details

455 673, 455135, 4552342, 4552781, 455296, 330129, 330279, H04B 110, H04B 1500

Patent

active

058094008

ABSTRACT:
Improved radio receiver designs are disclosed that can be used in the operational environment of wireless communications. The radio receiver includes a signal input terminal, a variable-current RF signal amplifier, a demodulator, and a controller. The variable-current RF signal amplifier has an input terminal for accepting RF input signals, an output terminal for generating an amplified version of the RF input signals, and a current control terminal for controlling the current consumption of the RF signal amplifier. The signal input terminal is coupled to the input terminal of the variable-current RF signal amplifier, the output terminal of the variable-current RF signal amplifier is coupled to the demodulator, and the current control terminal is coupled to the controller. The controller is also coupled to the demodulator. A received signal, including any noise and/or interference, is coupled to the signal input terminal. In response to signals amplified by the RF signal amplifier and demodulated by the demodulator, the controller controls the current consumed by the variable-current RF signal amplifier. The controller adjusts the current consumed by the RF signal amplifier to achieve at least a minimum acceptable signal-to-interference ratio for a desired signal, while the Noise Figure is not degraded any more than is necessary to achieve a minimum acceptable signal-to-interference ratio at any given time. In this manner, the variable current RF signal amplifier is adjusted to obtain a required amount of intermodulation performance for a given set of receiving conditions. This technique saves operating current and maintains fade margins because, in practice, interference conditions do not persist all of the time, and are usually of temporary duration.

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