A 15–38 GHz Vector-Summing Phase-Shifter With 360° Phase-Shifting Range Using Improved I/Q Generator
Feng Qiu, Haoshen Zhu, Liang Wu, Wenquan Che, Quan Xue
Abstract
This brief presents a 15–38 GHz vector-summing phase shifter (VSPS) with the full 360° phase-shifting range in the 65nm CMOS process. An improved wideband quadrature all-pass filter (QAF) is designed to overcome the traditional one’s capacitive loading effect and exhibits wideband I/Q performance. Analysis and comparison between the proposed QAF and the traditional one are discussed. For demonstration, a prototype VSPS with the full 360° phase-shifting range from 15GHz to 38GHz using the proposed QAF is implemented in the 65nm CMOS process. The root means square (RMS) phase and gain errors are 2°~3.5° and 0.7 dB ~1 dB from 15 GHz to 38 GHz, respectively. The power consumption is 19.2mW, and the whole chip is compact with a core size of 0.16mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> .