A V-Band 6-bit Active Phase Shifter with High Accuracy for Phase Arrays

A 6-bit digital 360° active phase shifter with high accuracy fabricated in 0.13-µm SiGe process is presented in this brief for V-band phased arrays. A transformer balun is applied for good balance and small chip area. A Lange coupler generates broadband I/Q signals. A novel operation mode of digital-to-analog convertors (DACs) control the I/Q amplitude to achieve high accuracy. The implemented phase shifter features good performance of 6-bit resolution between 58–63 GHz. The measured results are as follows: the peak average gain is 1.6 dB at 60 GHz, the root mean square (RMS) phase error is less than 2.2° and the RMS gain error is 0.05-0.46 dB. The active phase shifter occupies a compact size of 0.24 mm2.