A 6-18GHz 6-bit Phase Shifter for Broadband Phased Array Applications

Abstract

This paper presents a 6-18-GHz 6-bit broadband phase shifter (PS), which includes six stages. In order to acquire high phase shift resolution, broad bandwidth and small chip area, some different structures were used: (1)the switched-transmission-line structure was used to realize 5.625° phase shift. (2)the high-pass/low-pass filter structure was used to realize the 11.25°, 22.5° and 44.5° phase shifts. (3) the magnetically coupled all-pass network structure was used to realize 90° phase shift. (4)the lange-based structure was used to realize 180° phase shift. The phase shifter was designed in a 0.13-μm SiGe BiCMOS technology. The test results show that, the 6-bit phase shifter has a RMS error <4.3° and a insertion loss variation is ± 1dB at 6–18 GHz. The proposed 6-bit phase shifter achieves a high phase resolution with a broad band width. The core die occupies an area of 3.7mm ×1.2mm and consumes only 0.1 mA from a 1.8-V supply.