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A 0.023–12 GHz ultra-wideband frequency synthesizer with FOMT of −251.8 dB.

Authors :
Yang, Chao
Liu, Xiaoming
Jin, Jing
Zhou, Jianjun
Source :
Microelectronics Journal. Feb2022, Vol. 120, pN.PAG-N.PAG. 1p.
Publication Year :
2022

Abstract

A fully integrated ultra-wideband fractional- N frequency synthesizer is presented in this paper. Ultra-wideband quadrature signals can be generated by an octave-wide fractional- N phase-locked loop (PLL) and an ultra-wideband local oscillator (LO) signal generator. An optimized dual-core voltage-controlled oscillator (VCO) is employed to maintain relatively constant loop parameters in the octave-wide operating range, while a negative-capacitance VCO (NC–VCO) is proposed to solve the frequency gap problem and enhance the design freedom of the wideband VCO. Moreover, a wide-range programmable multi-modulus divider (PMMD) with seamless switching and fractional division resolution is proposed for error-free division operation and quantization noise compensation in the fractional- N mode, respectively. Power-efficient design is mainly achieved by the presented hybrid LO generator with optimized divider topologies for different frequency ranges. Fabricated in a 55 nm CMOS process, 0.023–12 GHz continuous quadrature LO signals can be generated by the proposed frequency synthesizer which occupies an active area of 0.55 mm2 and consumes 75–104 mW from a 1.2 V supply. The measured phase noise is −108.1 dBc/Hz at 1 MHz offset from a 12 GHz carrier, and the I/Q phase error is less than 2.7° with FOM T of −251.8 dB. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00262692
Volume :
120
Database :
Academic Search Index
Journal :
Microelectronics Journal
Publication Type :
Academic Journal
Accession number :
154736280
Full Text :
https://doi.org/10.1016/j.mejo.2022.105357