Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1996-09-30
1998-02-24
Pascal, Leslie
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
4552262, 4552341, 4552401, H04B 110, H03G 320
Patent
active
057220611
ABSTRACT:
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.
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Hutchison, IV James A.
Wheatley III Charles E.
Wieck Chris P.
Martin Roger W.
Miller Russell B.
Pascal Leslie
Qualcomm Incorporated
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