Methods and apparatus for calibrating received signal strength indicators

A received signal strength indicator detector, comprising:

• an amplifier and rectifier stage configured to convert a received radio frequency signal into a direct current signal having an indicator value corresponding to the received radio frequency signal;
• and
• a calibration circuit configured to derive a differential value representing a deviation from a desired indicator value under a maximum radio frequency power condition and to bias the indicator value with a power source to at least reduce the deviation from the desired indicator value
• wherein the calibration circuit includes a comparator configured to derive the differential value by comparing a measured indicator value with a reference indicator value representing the desired maximum indicator value, and wherein the calibration circuit also includes a calculation circuit coupled to the comparator, the calculation circuit being configured to calculate a bias factor based on the differential value, and further wherein the power source includes an adjustable current source configured to output a biasing current based on the bias factor.