Radio frequency (RF) signal power detector using different power rails to receive currents from which power-indicating voltage is generated

A wireless communication device, comprising:

• a transceiver configured to process a transmit signal to generate a radio frequency (RF) transmit signal;
• at least one antenna configured to wirelessly transmit the RF transmit signal;
• a signal sampler configured to generate a sampled RF signal related to the RF transmit signal;
• and
• an RF signal power detector, comprising:
• a first current source configured to generate a first current based on a power level of the sampled RF signal;
• a transimpedance amplifier (TIA) configured to generate a first voltage based on the first current, wherein the TIA is coupled between first and second voltage rails;
• and
• a second current source configured to generate a second current related to the first current or the first voltage, wherein the first and second current sources are coupled in series between a third voltage rail and the second voltage rail.