System for detecting current in an output stage of a power amplifier
AssigneeRF Micro Devices, Inc.
InventorsDarrell G. Epperson, Ulrik Riis Madsen
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Abstract
A system for detecting current in an output stage of power amplifier circuitry in a transmitter of a mobile terminal is provided. In general, the mobile terminal includes power amplifier circuitry, power control circuitry, current detection circuitry, and an inductor that essentially prevents radio frequency coupling between the power control circuitry and the power amplifier circuitry. Based on a voltage across the inductor, the current detection circuitry generates a voltage detection signal indicative of a current in the inductor and thus the current in an output stage of the power amplifier.
Claims12
A mobile terminal comprising:
- amplifier circuitry adapted to amplify a transmit signal based on a supply voltage;
- power control circuitry adapted to provide the supply voltage based on a source voltage and an adjustable power control signal;
- an inductor having a first terminal adapted to receive the supply voltage from the power control circuitry and a second terminal adapted to provide the supply voltage to the amplifier circuitry;
- and
- current detection circuitry adapted to determine a voltage across the inductor and generate a voltage detection signal that is indicative of a current in the inductor and thus the current in the amplifier circuitry.
A mobile terminal comprising:
- means for amplifying a transmit signal based on a supply voltage;
- means for providing the supply voltage based on a source voltage and an adjustable power control signal;
- means for essentially preventing coupling of high frequencies between the means for amplifying and the means for providing the supply voltage;
- and
- means for determining a voltage across the means for essentially preventing coupling of high frequencies between the means for amplifying and the means for providing the supply voltage and generating a voltage detection signal that is indicative of the current in the means for amplifying.
Dependencies are inferred from the claim text.