WIRELESS TRANSCEIVER WITH AMPLIFIER BIAS ADJUSTED BASED ON MODULATION SCHEME AND TRANSMIT POWER FEEDBACK
First Claim
1. An electronic device that is configured to wirelessly transmit radio-frequency signals using a plurality of cellular telephone modulation schemes, comprising:
- antenna structures;
a transceiver that produces the radio-frequency signals for transmission;
power amplifier circuitry that amplifies the radio-frequency signals for transmission of the radio-frequency signals through the antenna structures at an output power;
a power detector that produces measurements of the output power;
an adjustable voltage supply that supplies an adjustable power amplifier bias voltage to the power amplifier circuitry to power the power amplifier circuitry; and
control circuitry that is configured to direct the adjustable voltage supply to supply the adjustable power amplifier bias voltage at a level that is adjusted in real time based at least partly on which cellular telephone modulation scheme of the plurality of cellular telephone modulation schemes is currently being used in transmitting the radio-frequency signals through the antenna structures.
1 Assignment
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Accused Products
Abstract
An electronic device may contain a transceiver that transmits and receives radio-frequency signals through antenna structures. Power amplifier circuitry may amplify the radio-frequency signals that are being transmitted. An adjustable voltage supply may supply an adjustable power amplifier bias voltage to the power amplifier circuitry. The power amplifier circuitry may include multiple power amplifiers each of which may handle signals transmitted using a different cellular telephone standard. For each cellular telephone standard, multiple modulation schemes may be supported. A power detector may provide real time measurements of output power. Control circuitry can adjust the transceiver circuitry based on the measurements of output power and can adjust the adjustable power amplifier bias voltage in real time to select an optimum power amplifier bias voltage based on the current cellular telephone standard, modulation scheme, power amplifier gain state, and operating frequency in use.
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Citations
20 Claims
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1. An electronic device that is configured to wirelessly transmit radio-frequency signals using a plurality of cellular telephone modulation schemes, comprising:
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antenna structures; a transceiver that produces the radio-frequency signals for transmission; power amplifier circuitry that amplifies the radio-frequency signals for transmission of the radio-frequency signals through the antenna structures at an output power; a power detector that produces measurements of the output power; an adjustable voltage supply that supplies an adjustable power amplifier bias voltage to the power amplifier circuitry to power the power amplifier circuitry; and control circuitry that is configured to direct the adjustable voltage supply to supply the adjustable power amplifier bias voltage at a level that is adjusted in real time based at least partly on which cellular telephone modulation scheme of the plurality of cellular telephone modulation schemes is currently being used in transmitting the radio-frequency signals through the antenna structures. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for operating an electronic device with wireless communications circuitry that has a variable gain amplifier that supplies radio-frequency signals, a power amplifier that amplifies the radio-frequency signals and transmits the radio-frequency signals with an output power, an adjustable voltage supply that supplies a bias voltage to the power amplifier, and a power detector that measures the output power, comprising:
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wirelessly transmitting the radio-frequency signals with the wireless communications circuitry using a modulation scheme selected from a plurality of modulation schemes supported by the electronic device; and while wirelessly transmitting the radio-frequency signals using the modulation scheme, using the adjustable voltage supply to adjust the bias voltage to a level that is selected based at least partly on which of the plurality of modulation schemes is being used to wirelessly transmit the radio-frequency signals and using measurements from the power detector in adjusting the variable gain amplifier. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of operating an electronic device containing wireless communications circuitry that has been characterized across a plurality of cellular telephone standards and corresponding modulation schemes to produce calibration data for the electronic device, wherein the wireless communications circuitry includes a transceiver that produces radio-frequency signals, a power amplifier that transmits the radio-frequency signals at an output power, and a power detector that obtains measurements of the output power and wherein the calibration data comprises power amplifier bias voltage levels to use for each of the modulation schemes to enhance power conservation during operation of the electronic device, the method comprising:
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wirelessly transmitting the radio-frequency signals using the power amplifier in the electronic device; while wirelessly transmitting the radio-frequency signals, applying power amplifier bias voltages to the power amplifier in the electronic device at levels that are adjusted in real time based on the calibration data; and adjusting the transceiver based at least partly on the measurements of the output power. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification