Premium
A K‐band current‐reuse differential armstrong voltage‐controlled oscillator in 90 nm CMOS technology
Author(s) -
Nguyen Tai Nghia,
Chang IkJoon,
Lee JongWook
Publication year - 2013
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.27238
Subject(s) - voltage controlled oscillator , phase noise , electrical engineering , nmos logic , pmos logic , transconductance , cmos , digitally controlled oscillator , dbc , voltage , transistor , engineering , electronic engineering , vackář oscillator , materials science
We present a K‐band Armstrong voltage‐controlled oscillator (VCO) using the current‐reuse configuration.Although the current‐reuse configuration is suitable for low‐power VCO, its output power level and its phase at two differential outputs are not symmetric. This drawback in current‐reuse VCO is caused by its asymmetric structure, where the transconductance of the PMOS and NMOS transistors does not match. To achieve output waveform symmetry without consuming additional headroom, we embed a custom designed transformer between the input and output, realizing a new current‐reuse Armstrong VCO. The oscillator implemented in 90 nm CMOS process occupies a chip area of 0.75 × 0.5 mm 2 . And, it oscillates over the frequency range of 22.47–22.79 GHz with a good phase noise of −104 dBc/Hz at a 1 MHz offset. The VCO operates at a supply voltage of 1 V, and the power consumption of the VCO core is 4.5 mW. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:112–115, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27238