A 2‐ to 18‐GHz 6‐Bit Vector‐Sum Phase Shifter With Tunable Operating Band

ABSTRACT This paper presents a novel 2‐ to 18‐GHz vector‐sum phase shifter (VSPS), fabricated in 0.13‐μm SiGe BiCMOS technology, that employs a reconfigurable polyphase filter (PPF). In the proposed design, the fixed capacitors in the PPF network are replaced with varactors, providing tunable characteristics while preserving phase accuracy. A high‐precision variable gain amplifier (VGA) in the final synthesis stage further improves the phase‐shifting accuracy. Measurements show an RMS phase error below 1.5° and an RMS gain error under 1.2 dB across the full 2‐ to 18‐GHz band. The phase shifter achieves a low power consumption of 105 mW at a 3.3‐V supply and occupies a compact area of 1240 × 860 μm 2 . Trial Registration: Not applicable. This work does not involve clinical trials