Oliveira, L. B., J. R. Fernandes, MM Silver, I. M. Filanovsky, and C. J. M. Verhoeven. "Experimental evaluation of phase-noise and quadrature error in a CMOS 2.4 GHz relaxation oscillator." Circuits and Systems, 2007. ISCAS 2007. IEEE International Symposium on. IEEE,  2007. 1461-1464.