Title :
A 4.1-to-6.5GHz transformer-coupled CMOS quadrature digitally-controlled oscillator with quantization noise suppression
Author :
Zheng, Shiyuan ; Luong, Howard C.
Author_Institution :
Hong Kong Univ. of Sci. & Technol., Clear Water Bay, China
Abstract :
A wideband quadrature digitally-controlled oscillator (QDCO) operates in Class-C mode with embedded phase shifters for better phase noise and I-Q accuracy. Transformer-coupled fine tuning capacitors are controlled by a ΣΔ modulator with embedded filter to achieve fractional quantization step with intrinsic out-band noise suppression. The QDCO fabricated in 65nm CMOS measures tuning range of 45% from 4.1GHz to 6.5GHz with frequency resolution of 5Hz while achieving 1.2° phase error and a phase noise of -145.3dBc/Hz at 10MHz. It consumes 15mA from a 1.2V supply corresponding to a FoM of 186.6dBc/Hz and a FoMT of 199.8dBc/Hz.
Keywords :
CMOS analogue integrated circuits; MMIC oscillators; capacitors; field effect MMIC; phase noise; phase shifters; ΣΔ modulator; CMOS technology; I-Q accuracy; class-C mode; current 15 mA; embedded filter; embedded phase shifters; fractional quantization step; frequency 10 MHz; frequency 4.1 GHz to 6.5 GHz; intrinsic out-band noise suppression; phase error; phase noise; quantization noise suppression; size 65 nm; transformer-coupled CMOS quadrature digitally-controlled oscillator; transformer-coupled fine tuning capacitors; voltage 1.2 V; wideband QDCO; wideband quadrature digitally-controlled oscillator; Frequency modulation; Phase noise; Phase shifters; Quantization; Tuning; ΣΔ noise shaping; ADPLL; Class-C; QDCO; VCO; transformer; transformer-coupled;
Conference_Titel :
Radio Frequency Integrated Circuits Symposium (RFIC), 2012 IEEE
Conference_Location :
Montreal, QC
Print_ISBN :
978-1-4673-0413-9
Electronic_ISBN :
1529-2517
DOI :
10.1109/RFIC.2012.6242336
