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This paper presents a 60 GHz 65 nm CMOS RMS power detector to be used in a Power Amplifier regulation loop. The presented test-chip integrates also a differential capacitive coupler sensing the RF voltage on a differential transmission line. The circuit shows 25 dB of linear detection range at 60 GHz, well enough to cover a VSWR of up to 7:1 caused by antenna impedance mismatch while still having 10 dB margin for output power regulation. The detector consumes only 50 muA from a 1.2 V power supply and occupies an active area of 80 times 80 mum2.