A 0.6–2.8GHz CMOS RF vector multiplier with low RMS magnitude and phase errors and high P1dB

In this paper, a fully-integrated CMOS broadband RF vector multiplier (RFVM) with low root-mean-square (RMS) magnitude and phase errors and high linearity is presented. The proposed RFVM includes a three-stage RC poly-phase filter (PPF) to generate the quadrature phase signals, two parallel phase-invariant variable gain amplifiers (VGA) to adjust the amplitude and phase of the input RF signal, and a two-stage post amplifier to provide sufficient output power. Fabricated on a 0.13μm CMOS process, the RFVM demonstrator allowed for magnitude and phase control ranges of 30dB and 360 degrees over a broad operation bandwidth spanning from 0.6 to 2.8GHz. The measured root-mean-square amplitude and phase errors were limited to 0.17dB and 2.5 degrees. A high input 1-dB compression power of 3 to 5dBm was maintained over the targeted bandwidth.