Title :
Quadrature relaxation oscillator with FoM of −165 dBc/Hz
Author :
Ortigueira, E. ; Rabuske, Taimur ; Bica Oliveira, LuiÌs ; Fernandes, J. ; Silva, M.
Author_Institution :
INESC-ID, Lisbon, Portugal
Abstract :
RC oscillators have lower cost and higher tuning range than LC oscillators. However, their phase noise performance is poor and in the case of the relaxation oscillator it is also far from the theoretical optimum. In this paper we present a new circuit of a quadrature relaxation oscillator with faster switching and high amplitude output signal to improve the FoM. The sizing of a prototype in a 130nm CMOS technology was done using a genetic algorithm tool. Simulation results show that the quadrature oscillator operating at 2.4 GHz achieves a figure of merit of -165 dBc/Hz.
Keywords :
CMOS integrated circuits; UHF integrated circuits; UHF oscillators; circuit tuning; genetic algorithms; phase noise; relaxation oscillators; CMOS technology; FoM; UHF integrated circuits; UHF oscillators; figure of merit; frequency 2.4 GHz; genetic algorithm tool; phase noise; quadrature relaxation oscillator; size 130 nm; tuning range; CMOS integrated circuits; Phase noise; Power demand; Ring oscillators; Switching circuits; Transistors;
Conference_Titel :
Circuits and Systems (ISCAS), 2014 IEEE International Symposium on
Conference_Location :
Melbourne VIC
Print_ISBN :
978-1-4799-3431-7
DOI :
10.1109/ISCAS.2014.6865399
