US 2010/0144286 A1 · WIRELESS TRANSMITTER CALIBRATION USING DEVICE RECEIVER

Abstract

Portable electronic devices are provided that contain radio-frequency transceiver circuitry. Power amplifier circuitry may amplify transmitted radio-frequency signals from the radio-frequency transceiver circuitry. The power amplifier circuitry may be powered with a power supply voltage. The power supply voltage may be reduced to conserve power provided that requirements such as adjacent channel leakage ratio requirements are satisfied. Calibration measurements may be made to determine the extent to which power can be conserved by power supply voltage reductions. During calibration, the transceiver circuitry may transmit signals in a transmit subband. Test equipment that is external to the device may frequency shift the transmitted signals into a receive subband. The frequency-shifted signals may be fed back into the device. The transceiver circuitry in the device may make power measurements on the fed back signals. The power measurements may be used to compute adjacent channel leakage ratio values.

Claims20

Dependent claims

A method for using test equipment to calibrate a portable electronic device that contains wireless circuitry, comprising:

transmitting radio-frequency signals from transceiver circuitry in the electronic device to the test equipment;
and
with the transceiver circuitry in the electronic device, measuring a power level associated with a fed-back version of the transmitted radio-frequency signals received from the test equipment.

A method for calibrating a wireless electronic device having at least one antenna, transceiver circuitry, a radio-frequency power amplifier, and an adjustable power supply that supplies the radio-frequency power amplifier with an adjustable power supply voltage, comprising:

with the radio-frequency power amplifier, amplifying radio-frequency signals from the transceiver circuitry at a given frequency to be transmitted through the antenna;
with the adjustable power supply, providing an adjustable power supply voltage to the radio-frequency power amplifier that varies as a function of the given frequency;
and
with the transceiver circuitry, making a power measurement on a fed-back version of the amplified radio-frequency signals that is received from test equipment.

1 more element

Dependencies are inferred from the claim text.

Wireless transmitter calibration using device receiver

Life of this patent

Wireless transmitter calibration using device receiver

Life of this patent

Abstract

Claims20