Rf integrated circuit for performing calibration operation for stable operations of power amplifiers included in plurality of transmission channels

A radio frequency (RF) integrated circuit comprising:

• a first power amplifier configured to amplify a first RF signal based on a first bias;
• a second power amplifier configured to amplify a second RF signal based on a second bias;
• a bias circuit configured to provide the first bias to the first power amplifier and provide the second bias to the second power amplifier;
• a first current sensor configured to sense a first bias current due to the first bias of the first power amplifier and sense a second bias current due to the second bias of the second power amplifier;
• and
• a first comparator configured to compare a first sensing result corresponding to the first bias current with a second sensing result corresponding to the second bias current and output a corresponding first comparison result,
• wherein the bias circuit is further configured to adjust the second bias based on the first comparison result.

A radio frequency (RF) integrated circuit comprising:

• a first front-end circuit connected to a first antenna and configured to amplify and transmit a first RF signal;
• and
• a bias calibration circuit configured to perform a calibration operation on a first bias voltage of a first power amplifier of the front-end circuit, the first power amplifier including at least first and second stacked amplification stages,
• wherein the bias calibration circuit comprises a first operational amplifier connected to the first stacked amplification stage at a first bias node as part of a feedback loop to maintain the first bias node at the first bias voltage in the calibration operation.