A 5-20 GHz 5-Bit True Time Delay Circuit in 0.18 μm CMOS Technology

摘要

This paper presents a 5-bit true time delay circuit using a standard 0.18 μm CMOS process for the broadband phased array antenna without the beam squint. The maximum time delay of ～106 ps with the delay step of ～3.3 ps is achieved at 5-20 GHz. The RMS group delay and amplitude errors are ＜ 1 ps and ＜2 dB, respectively. The measured insertion loss is ＜27 dB and the input and output return losses are ＜12 dB at 5-15 GHz. The current consumption is nearly zero with 1.8 V supply. The chip size is 1.04 x 0.85 mm2 including pads.