A calibratable 4.8-5.8 GHz MMIC vector modulator with low power consumption for smart antenna receivers

A highly integrated 4.8-5.8 GHz vector modulator MMIC using a 0.6 /spl mu/m GaAs MESFET foundry process is presented. Variable gain amplifiers with amplitude control ranges of 35 dB are applied to enable continuous amplitude and phase control of 15 dB and 360/spl deg/ by combining three vectors with phase offsets of 120/spl deg/. Maximum gain is 0 dB. The maximum current consumption using a 2.7 V voltage supply is only 3.2 mA. A calibration procedure is proposed to significantly improve the yield and the operation bandwidth.