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Receiver-control-in-a-communication-device-by-antenna-de-tuning-in-strong-signal-conditions-and-method-therefor

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Receiver control in a communication device by antenna de-tuning in strong signal conditions, and method therefor

Details

Inventors: Kromer, Jonathan William Joseph; Cannon, Gregory Lewis;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Eisenzopf; Reinhard J.
Assistant Examiner: To; Doris
Attorney, Agent or Firm: Meles; Pablo

A communication device (100) including an antenna (110) for receiving a signal. A receiver circuit (12) is coupled to the antenna (110) and demodulates the signal which is received by the antenna (110). A signal strength measuring circuit (126) is coupled to the antenna (110) and generates a signal strength indicator signal representing a strength of the signal received by the antenna (110). A controller (130) is coupled to the receiver circuit (120) for receiving the signal strength indicator signal and generating a tuning signal in response thereto. An antenna tuning circuit (140) is coupled to the controller (130) and is responsive to the tuning signal for tuning the antenna (110) to a reduced gain level when the strength of the signal received by the antenna (110) is indicative of strong signal conditions.

DETAILED DESCRIPTION OF THE DRAWINGS Referring first to FIG.
1, a communication device 100 is shown.
The communication device 100 comprises an antenna 110 for receiving signals transmitted to the communication device 100.
A receiver circuit 120 has an input which is coupled to the antenna for demodulating the received signal(s).
The receiver circuit 120 includes a front-end processing circuit 122 and a back-end processing circuit 124.
The front-end processing circuit 122 typically includes amplifiers and filters for amplifying the received signal.
The back-end processing circuit 124 typically includes mixers and filters for demodulating the received signal.
The receiver circuit has an output that is coupled to a controller 130.
The controller is the overall control point for the communication device 100.
The controller 130 is a microprocessor based device which includes at least a ROM 132, a RAM 134 and a central processing unit (CPU) 136.
The antenna 110 is tuned to the receiver circuit 120 by an antenna tuning circuit 140.
The antenna tuning circuit 140 is controlled by a tuning signal generated by the controller 130 in response to a signal strength indicator signal supplied as input thereto.
According to the present invention, it is desirable to adjust the gain of the antenna 110 (also referred to as "tuning" the antenna) , particularly when the communication device is experiencing strong signal conditions.
To this end, the receiver circuit 120 includes, typically within the back-end processing circuit 124 (though it could be located with the front-end processing circuit 122), a signal strength measuring circuit 126 for measuring the strength of the received signal.
The signal strength measuring circuit 126 can take the form of an automatic gain control (AGC) circuit or a circuit capable of generating a received signal strength information (RSSI) signal.
In the case of the AGC circuit, an AGC control signal is generated based on the signal strength of the received signal in order to adjust the gain of amplifiers in the front-end processing circuit 122

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