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US 10,230,335 B2Granted
Temperature compensated power amplifier gain
AssigneeSkyworks Solutions, Inc.
InventorsGordon Glen Rabjohn, Edward John Wemyss Whittaker, Grant Darcy Poulin
Life of this patent
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Abstract
A temperature compensation circuit comprises a temperature coefficient circuit that generates a temperature coefficient that is temperature dependent and a compensation circuit that generates a compensation signal based on an indication of temperature of an amplifier and the temperature coefficient, and based on the compensation signal, a gain of the amplifier is adjusted to improve amplifier linearity during data bursts.
Claims21
A power amplifier system comprising:
- a power amplifier configured to amplify a wireless local area network signal;
- a sampling circuit configured to capture an indication of initial temperature of the power amplifier when the power amplifier is energized, and
- a temperature compensation circuit configured to generate a compensation signal based on a temperature coefficient that is temperature dependent and an indication of temperature change relative to the initial temperature of the power amplifier, and to cause a gain of the power amplifier to be adjusted based on the compensation signal, the temperature compensation circuit including a multiplier configured to multiply the indication of the temperature change by the temperature coefficient.
A power amplifier system comprising:
- a power amplifier configured to amplify a wireless local area network signal;
- a sampling circuit configured to capture an indication of initial temperature of the power amplifier when the power amplifier is energized, and
- a temperature compensation circuit configured to generate a compensation signal based on a temperature coefficient that is temperature dependent and an indication of temperature change relative to the initial temperature of the power amplifier, and to cause a gain of the power amplifier to be adjusted based on the compensation signal, the temperature compensation circuit including a temperature coefficient circuit that includes a first digital register configured to store a base coefficient value and a second digital register configured to store a value to set a rate of change of the temperature coefficient over temperature, the temperature coefficient circuit configured to generate the temperature coefficient based on an indication of average temperature of the power amplifier, which is based on the values in the first digital register and the digital second register.
A method of adjusting a gain of a power amplifier, the method comprising:
- generating a temperature coefficient based on an indication of average temperature of a power amplifier;
- storing an indication of initial temperature of the power amplifier when the power amplifier is energized;
- generating a compensation signal based on the temperature coefficient and an indication of a change in temperature of the power amplifier relative to the initial temperature;
- and
- modifying a reference current based on the compensation signal and generating a bias voltage from the modified reference current, the bias voltage provided to a first stage of the power amplifier to adjust a gain of the power amplifier that includes multiple stages.
2 more elements
A method of adjusting a gain of a power amplifier, the method comprising:
- generating a temperature coefficient based on an indication of average temperature of a power amplifier;
- storing an indication of initial temperature of the power amplifier when the power amplifier is energized;
- multiplying the temperature coefficient and an indication of a change in temperature of the power amplifier relative to the initial temperature to generate a compensation signal;
- and
- adjusting a gain of the power amplifier based on the compensation signal.
2 more elements
A method of adjusting a gain of a power amplifier, the method comprising:
- multiplying an indication of average temperature of a power amplifier by a rate to generate a multiplication result and subtracting the multiplication result from a base temperature coefficient to generate a temperature coefficient;
- storing an indication of initial temperature of the power amplifier when the power amplifier is energized;
- generating a compensation signal based on the temperature coefficient and an indication of a change in temperature of the power amplifier relative to the initial temperature;
- and
- adjusting a gain of the power amplifier based on the compensation signal.
2 more elements
A wireless communication device comprising:
- an antenna configured to transmit an amplified radio frequency signal;
- and
- a power amplifier system including a power amplifier configured to provide the amplified radio frequency signal, a sampling circuit configured to capture an indication of initial temperature of the power amplifier when the power amplifier is energized, and a temperature compensation circuit configured to generate a compensation signal based on a temperature coefficient that is temperature dependent and an indication of temperature change relative to the initial temperature of the power amplifier, and to cause a gain of the power amplifier to be adjusted based on the compensation signal, the temperature compensation circuit including a temperature coefficient circuit configured to generate the temperature coefficient based on an indication of average temperature of the power amplifier.
Dependencies are inferred from the claim text.