Title :
A 3.16 – 12.8GHz low phase noise N-Push/M-push cyclic coupled ring oscillator
Author :
Abdul-Latif, Mohammed M. ; Sanchez-Sinencio, Edgar
Author_Institution :
Texas A&M Univ., College Station, TX, USA
Abstract :
A topology for realizing wideband ring oscillators is introduced. Five three-stage ring oscillators operating over a frequency range of 1-2.56GHz are coupled using uni-lateral cyclic coupling. This provides phase shifted outputs which are combined twice in an N-Push or M-Push operation (N=3 and M=5) resulting in an output signal of 3.16-12.8GHz. This coupled structure improves phase noise by 10log10M=7dB producing -103.4 and -101.6 dBc/Hz at 1MHz offset for 3.16GHz and 12.8GHz, respectively. A prototype fabricated in 90nm CMOS consumes 13-200mW across the tuning range.
Keywords :
CMOS analogue integrated circuits; MMIC oscillators; UHF oscillators; coupled circuits; phase noise; CMOS process; frequency 1 GHz to 2.56 GHz; frequency 3.16 GHz to 12.8 GHz; low phase noise n-push-m-push cyclic coupled ring oscillator; noise figure 7 dB; power 12 mW to 200 mW; size 90 nm; unilateral cyclic coupling; wideband ring oscillator; CMOS integrated circuits; Couplings; Phase noise; Ring oscillators; Tuning; Wideband; CMOS; N-Push; Ring oscillators; coupled oscillators; voltage-controlled oscillators; wideband;
Conference_Titel :
Radio Frequency Integrated Circuits Symposium (RFIC), 2011 IEEE
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-4244-8293-1
Electronic_ISBN :
1529-2517
DOI :
10.1109/RFIC.2011.5940679
