Active Quasi-Circulator MMIC Using OTAs

作者：Zheng You^*; Saavedra Carlos E

来源：IEEE Microwave and Wireless Components Letters, 2009, 19(4): 218-220.

DOI：10.1109/LMWC.2009.2015500

• Active circulators
• active quasi-circulators
• operational transconductance amplifier (OTA)

A very compact, active quasi-circulator is proposed and experimentally demonstrated in this work. It consists of an active balun and a current combiner using operational transconductance amplifiers in CMOS. Experimental results show that the insertion loss between the circulation ports is low and all three ports have input reflection coefficients below -10 dB. The chip operates from 1.5 to 2.7 GHz and it outperforms previously known monolithic microwave integrated circuit circulators covering this frequency range in terms of the S(31) isolation, standing at -26 dB, as well as physical size: the integrated circuit measures only 0.25 mm(2) including bonding pads.

• 出版日期2009-4