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Method-and-apparatus-for-increasing-receiver-immunity-to-interference

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Details

Inventors: Hutchison, IV, James A.; Wheatley, III, Charles E.; Wieck, Chris P.;
Assignee: QUALCOMM Incorporated (San Diego, CA)
Primary Examiner: Pascal; Leslie
Assistant Examiner:
Attorney, Agent or Firm: Miller; Russell B., Martin; Roger W.

A method for adjusting the gain of a receive circuit, thereby improving a receiver's immunity to interference. The circuit has an LNA which amplifies the received signal. The receive signal power is controlled by enabling or disabling the LNA in response to the measured received signal power. The received power level is periodically compared to a threshold. When the received power level is greater than the threshold, the LNA is disabled. The LNA is re-enabled when the received power level is less than the threshold, and there are no significant intermodulation components detected. The intermodulation components are detected by briefly enabling the LNA and detecting the resultant change in the measured signal power. If the detected change is more than a predetermined amount, then there are significant intermodulation components present, and the LNA is not re-enabled. Otherwise, there are not significant intermodulation components present, and the LNA is re-enabled.

DETAILED DESCRIPTION The process of the present invention adjusts the gain of a receive circuit, thereby improving a receiver's immunity to interference.
The circuit has an LNA which amplifies the received signal.
The receive signal power is controlled by enabling or disabling the LNA in response to the measured received signal power.
The received power level is periodically compared to a threshold.
When the received power level is greater than the threshold, the LNA is disabled.
The LNA is re-enabled when the received power level is less than the threshold, and there are no significant intermodulation components detected.
The intermodulation components are detected by briefly enabling the LNA and detecting the resultant change in the measured signal power.
If the detected change is more than a predetermined amount, then there are significant intermodulation components present, and the LNA is not re-enabled.
However, if the detected change is less than the predetermined amount, then there are not significant intermodulation components present, and the LNA is re-enabled.

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