A 28GHz Reflective-Type Transmission-Line-Based Phase Shifter
Madhavi Kadam, Abhishek Kumar, Sankaran Aniruddhan
Abstract
This work presents a 28GHz reflection type transmission-line (TL) based phase shifter. The proposed architecture employs a completely passive approach to double the phase shift achievable using a TL when compared to conventional architectures. The phase shifter, along with a preceding low noise amplifier and buffer, is implemented in a 65nm CMOS process. The fabricated chip achieves a measured phase resolution of 11.25° at 28GHz, with an rms error of 3° and a total phase shift of 180°. The insertion loss of the phase shifter alone is 17dB. The active area of the entire phase shifter, including LNA and buffer is 0.41mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> .