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This paper presents a novel unbalanced transformerless vector-sum phase shifter architecture. The proposed approach is based on the forming of four signals from the input unbalanced signal by an RC quadrature all-pass filter. These signals are subtracted to obtain a pair of orthogonal signals which are added on the load network of the Gilbert cells with weighted coefficients to form the differential...
This paper presents a fully integrated vector-sum phase shifter with a 6-bit digital control in 0.18 um CMOS technology. The proposed architecture of the phase shifter control circuit provides the RMS phase error below 1.5 degrees due to the novel amplifier gain control circuit. The measured maximum gain is −5 dB and input 1 dB compression point is up to 4 dBm. The RMS phase error is less than 4.5...
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