Radio frequency device applied in phased array antenna with power detection and calibration, semiconductor device and method thereof

A semiconductor device comprising:

• a power amplifier configured to output a radio frequency (RF) signal;
• and
• a power detector configured to receive the RF signal, and perform a plurality of calibration operations to generate a plurality of calibration voltages corresponding to a plurality of bias voltages, wherein the plurality of calibration operations are performed at the plurality of bias voltages respectively, and the plurality of calibration voltages are temperature-correlated due to that electrical characteristics of the power detector are temperature-correlated;
• wherein the calibration voltages are configured to calculate an index voltage for indicating power of the RF signal and reduce temperature dependency of the index voltage.

A method for detecting power of a radio frequency signal with a power detector, the method comprising:

• controlling the power detector to perform a plurality of calibration operations for generating a plurality of calibration voltages according to the RF signal and a plurality of bias voltages, wherein the plurality of calibration voltages are temperature-correlated due to that electrical characteristics of the power detector are temperature-correlated;
• and
• obtaining an index voltage for indicating power of the RF signal by performing calculations upon the plurality of calibration voltages to reduce temperature dependency of the index voltage;
• and
• adjusting a gain of a power amplifier according to the index voltage;
• wherein the plurality of calibration operations are performed at the plurality of bias voltages respectively.