Open Access2.5–7 GHz single balanced mixer with integrated Ruthroff‐type balun in 0.18 µm CMOS technology
Author(s) -
Chiou H.K.,
Chung H.Y.
Publication year - 2013
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2012.4091
Subject(s) - balun , insertion loss , cmos , electrical engineering , materials science , broadband , electrical impedance , transmission line , bandwidth (computing) , chip , return loss , impedance matching , optoelectronics , electronic engineering , engineering , telecommunications , antenna (radio)
An on‐chip Ruthroff‐type balun fabricated in tsmc TM 0.18 µm CMOS technology has been realised and used in a single balanced mixer. By using the phase compensation line and appropriately choosing the characteristic impedance of transmission lines, the balun was realised with a minimum insertion loss of 0.71 dB and the 1 dB bandwidth over a frequency range from 3.2 to 8.4 GHz. The compact size of 0.088 mm 2 is achieved owing to the short length of the transmission line winding, approximately 1/18 λ g , and the adoption of broadside‐coupled and spiral‐shape structures. A simple single balanced mixer with the Ruthroff‐type balun was then designed to demonstrate the capability of the broadband and low‐loss balun. A minimum conversion loss of 12.48 dB with a 3 dB bandwidth from 2.5 to 7 GHz was measured at the LO drive of only 6 dBm. The chip area, including pads, is 0.49 mm 2 .