LNA gain adjustment for intermodulation interference reduction

Details LNA gain adjustment for intermodulation interference reduction LNA gain adjustment for intermodulation interference reduction

2005-11-01

2005-11-01

Vo, Nguyen T. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S250100, C375S345000

Reexamination Certificate

active

06961552

ABSTRACT:
The radio receiver includes a low noise amplifier that amplifies a received signal to one of three different gain settings. One gain setting is maximum amplification, a second gain setting is 6 dB below maximum amplification and a third gain setting is 32 dB below maximum amplification. In the case of the third setting, the low noise amplifier actually attenuates the received signal by 6 dB. The radio receiver includes a pair of received signal strength indicators that provide received signal strength indications to logic circuitry. Responsive to the received signal strength indications, the logic circuitry generates control commands to the low noise amplifier to prompt it to amplify at one of the three specified levels. Generally, if the received signal has a gain level that exceeds a specified threshold, the low noise amplifier actually attenuates the received signal; otherwise, the level of amplification that is actually provided is a function of the presence of intermodulation interference.

REFERENCES:
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patent: 6731703 (2004-05-01), Kurihara
patent: 6804501 (2004-10-01), Bradley et al.
patent: 2001/0046867 (2001-11-01), Mizoguchi

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