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A CMOS RF power detector for an Automatic Impedance Matching System

This paper presents the design of a CMOS RF RMS power detector for an Automatic Impedance Matching System. The power detector requirements for this application, in terms of dynamic range, resolution, settling time and power consumption, are met by distributing the dynamic range over three power detection units. The appropriate unit is dynamically selected based on the input power range. The output of the detector is digital and linear-in-decibel. The selectors and detection units have been designed in 0.13-μm CMOS technology. Circuit-level simulation results show a dynamic range of 27 dB for input frequencies extending from 800 MHz to 8.5 GHz. The sensitivity of the power detector is −27 dBm, the settling time is less than 12 μs and the power consumption is 1.2 mW.