A theoretical and experimental study of the noise behavior of subharmonically injection locked local oscillators

• Published in: IEEE transactions on microwave theory and techniques 1992-05, Vol.40 (5), p.895-902
• Main Authors: Zhang, X., Zhou, X., Daryoush, A.S.
• Format: Article
• Language: English
• Subjects: Active noise reduction; Applied sciences; Circuit properties; Degradation; Electric, optical and optoelectronic circuits; Electronic circuits; Electronics; Electronics And Electrical Engineering; Exact sciences and technology; Harmonic analysis; Injection-locked oscillators; Noise generators; Noise level; Nonlinear optics; Optical control; Optical noise; Oscillators, resonators, synthetizers; Signal analysis
• ISSN: 0018-9480; 1557-9670
• DOI: 10.1109/22.137395

A method for the phase-noise characterization of optically controlled subharmonically injection-locked oscillators that is based on a nonlinear model of synchronized oscillators is presented. It allows FM noise degradation at large-signal levels to be predicted easily and accurately. The theoretical analysis shows that (1) the nth-order subharmonic injection locking oscillator is primarily locked by the nth harmonic output of an injected signal, which is generated by the nonlinearity of the active device; (2) the minimum FM noise degradation factor of the nth-order subharmonically locked oscillator is n/sup 2/ when the injection power is sufficiently strong; and (3) a subharmonic injection locking LO with low injection power, good FM noise degradation, and large locking range can be designed by determining the optimum injection power level, by selecting the optimal nonlinear multiplication factor, and by decreasing the intrinsic noise level of the active device. The experimental results confirm the accuracy of the analysis.< >