The Effect of Mismatches and Delay on the Quadrature Error of a Cross-Coupled Relaxation Oscillator.
Jorge R. FernandesMichiel H. L. KouwenhovenChris van den BosLuís B. OliveiraChris J. M. VerhoevenPublished in: IEEE Trans. Circuits Syst. I Regul. Pap. (2007)