Patent ID: 8422968

Claim:
Wireless communications circuitry on a portable electronic device, comprising: antenna structures; radio-frequency transceiver circuitry and radio-frequency power amplifier circuitry that transmit wireless radio-frequency signals through the antenna structures at an output power; a power detector that produces measurements of the output power; and control circuitry that controls the radio-frequency transceiver and power amplifier circuitry to adjust the output power, wherein the control circuitry is configured to operate in an open-loop regime in which the output power is adjusted without using the measurements of the output power, in a transition zone in which open-loop adjustments by the control circuitry are modified based on the measurements of the output power, and in a closed-loop regime, wherein the radio-frequency transceiver circuitry and radio-frequency power amplifier circuitry are configured to transmit the wireless radio-frequency signals in a given frequency band in the closed-loop regime, the open-loop regime, and the transition zone, wherein the given frequency band is selectable from a plurality of frequency bands, wherein, in the open-loop regime and in the transition zone, the output power for a given requested power is different for each frequency band in the plurality of frequency bands, and wherein in the closed-loop regime, the output power for a given requested power is the same for each frequency band in the plurality of frequency bands.