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US 7,068,985 B2Granted
Radio transmitters with temperature compensated power control profiles and methods of operating same
AssigneeSony Ericsson Mobile Communication AB
InventorsHakan Quilisch, Soren Karlsson
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Abstract
A radio transmitter includes a power control table, a power amplifier, and a power controller. The power control table includes a plurality of control values. The power amplifier amplifies an RF signal for transmission with an adjustable gain. The power controller adjusts the gain of the power amplifier based on the power control table and a temperature signal that is indicative of a temperature of at least a portion of the radio transmitter.
Claims14
A radio transmitter comprising:
- a power control table that includes a plurality of control values;
- a power amplifier that is configured to amplify with an adjustable gain an RF signal for transmission;
- and
- a power controller that is configured to adjust the gain of the power amplifier based on the control values of the power control table and a temperature signal that is indicative of a temperature of at least a portion of the radio transmitter, wherein:
- the power control table comprises a baseline power control table that defines a plurality of voltage values and corresponding timing values;
- and comprises a high temperature offset control table that defines a plurality of voltage values and corresponding timing values;
- and
- the power controller is further configured to adjust the gain of the power amplifier based on the baseline power control table when the temperature signal satisfies a predetermined baseline temperature value, and is configured to combine the values of the baseline power control table and the values of the high temperature offset control table to adjust the gain of the power amplifier when the temperature signal satisfies a predetermined high temperature value.
5 more elements
A method of controlling a power amplifier in a radio transmitter, the method comprising:
- providing a power control table that includes a plurality of control values;
- amplifying an RF signal for transmission with an adjustable amplification gain;
- adjusting the amplification gain based on the plurality of control values in the power control table and based on a temperature signal that is indicative of a temperature of at least the power amplifier, wherein:
- providing a power control table comprises providing a baseline power control table that defines a plurality of voltage values and corresponding timing values, and providing a high temperature offset control table that defines a plurality of voltage values and corresponding timing values;
- and
- adjusting the amplification gain comprises adjusting the amplification gain based on the baseline power control table when the temperature signal satisfies a predetermined baseline temperature value, and comprises adjusting the amplification gain based on a combination of the values of the baseline power control table and the values of the high temperature offset control table when the temperature signal satisfies a predetermined high temperature value.
3 more elements
Dependencies are inferred from the claim text.