Patent ID: 7974598
Filing Date: 2011-07-05
Classification: H04B

Abstract:
1. A received signal strength indicator detector, comprising: an amplifier and rectifier stage configured to convert a received radio frequency signal having a signal power level into a direct current signal and to output an indicator value corresponding to the signal power level; and a calibration circuit configured to measure a maximum value of the indicator value based on a maximum value of the signal power level and to bias the indicator value according to a bias factor calculated based on the measured maximum indicator value, a desired maximum indicator value, a desired indicator threshold, and a desired power range of the received signal strength indicator wherein the calibration circuit includes a comparator, a calculation circuit, and an adjustable current source coupled in series, wherein the bias factor includes an offset factor, and wherein the comparator is configured to determine a differential signal (V the calculation circuit is configured to calculate the offset factor as follows: the adjustable current source is configured to bias a subsequently measured indicator value (V