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Multiband multistandard frequency synthesizer for mobile TV tuner with LC‐VCO by digital AAC
Author(s) -
Lee Jae Kyung,
Kim YoungJin,
Cho Choon Sik
Publication year - 2016
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.29918
Subject(s) - voltage controlled oscillator , dbc , tuner , phase noise , electrical engineering , varicap , inductor , engineering , microwave , voltage , swing , direct digital synthesizer , phase locked loop , frequency synthesizer , electronic engineering , physics , radio frequency , capacitance , telecommunications , mechanical engineering , electrode , quantum mechanics
To improve the phase noise (PN) degradation from the tail current source, this article present s an inductor‐capacitor voltage‐controlled oscillator (LC‐VCO) with digitally controlled programmable low drop out. The digital automatic amplitude calibration (AAC) loop is successively implemented to make the voltage swing constant over 900–1940 MHz. A 40–970 MHz frequency synthesizer with switching dividers is implemented to support the operating frequency range of the multiband mobile TV tuners. The PN of −130 dBc/Hz @ 1 MHz offset is obtained at 474 MHz. The PN variation by the help of AAC loop is measured <2.4 dB over −40–85°C. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1838–1841, 2016