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A current‐reused voltage‐controlled oscillator with balanced enlarged amplitude via decoupling capacitance adoption
Author(s) -
Kuo KoChi,
Lin ShunDao,
Hou HsiaoHan
Publication year - 2012
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.26904
Subject(s) - voltage controlled oscillator , phase noise , dbc , decoupling (probability) , capacitance , amplitude , electrical engineering , voltage , cmos , capacitor , decoupling capacitor , microwave , varicap , materials science , electronic engineering , engineering , physics , telecommunications , electrode , quantum mechanics , control engineering
This article presents a low‐power current‐reused voltage‐controlled oscillator (VCO) with a decoupling capacitance. The proposed VCO applies a decoupling capacitance between the power supply and degeneration resistance in the VCO to reduce the unbalanced characteristics of the current‐reused VCO. Adopting the decoupling capacitance can balance and enlarge the output amplitude while enhancing the phase noise. The simulated amplitude unbalance ratio is 5%, compared with 11% of the amplitude unbalance ratio of a conventional current‐reused VCO. In addition, the proposed design enlarges the amplitude by 25%, compared with the amplitude of a conventional current‐reused VCO without increasing power consumption. The proposed design has been fabricated in a TSMC 0.18‐μm CMOS process. The power consumption is 1.6 mW from a 1.8 V supply. The fabricated VCO operates from 2.1 to 2.7 GHz with a 22.7% tuning range. The measured phase noise is −121 dBc/Hz at 1 MHz offset at 2.2 GHz. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1626–1629, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26904