US 8,913,970 B2 · Wireless transceiver with amplifier bias adjusted based on modulation scheme

Abstract

An electronic device may contain wireless circuitry 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. Some modulation schemes may have greater power amplifier linearity requirements than others. Control circuitry 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.

Claims14

Dependent claims

A method for operating an electronic device, comprising:

with wireless communications circuitry in the electronic device that contains a power amplifier and an adjustable voltage power supply that supplies a power supply voltage to the power amplifier to power the power amplifier, wirelessly transmitting radio-frequency signals 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 power supply to adjust the power supply 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.

An electronic device that is configured to wirelessly transmit radio-frequency signals using a plurality of cellular telephone modulation schemes, comprising:

antenna structures;
wireless communications circuitry 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;
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 directs 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, wherein the control circuitry includes storage that contains calibration data, wherein the calibration data includes calibration data specifying which levels of power amplifier bias voltage the control circuitry is to use across multiple operating frequencies.

3 more elements

Dependencies are inferred from the claim text.

Wireless transceiver with amplifier bias adjusted based on modulation scheme

Life of this patent

Wireless transceiver with amplifier bias adjusted based on modulation scheme

Life of this patent

Abstract

Claims14