Quadrature Relaxation Oscillator with FoM of -165 dBc/Hz

Eduardo Ortigueira, Taimur Rabuske, Luís Augusto Bica Gomes de Oliveira, Jorge R. Fernandes, Manuel de Medeiros Silva

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)


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.
Original languageEnglish
Title of host publicationCircuits and Systems (ISCAS), 2014 IEEE International Symposium on
Publication statusPublished - 1 Jan 2014
EventIEEE Int. Symp. Circuits and Systems (ISCAS’14) -
Duration: 1 Jan 2014 → …


ConferenceIEEE Int. Symp. Circuits and Systems (ISCAS’14)
Period1/01/14 → …


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