In this paper some considerations on different oscillator topologies are presented with the aim of analyzing their behavior and determining what are good choices to synthesize a reference signal at a given frequency with low phase noise level. Preliminary results, obtained by means of a "pushing factor"-based analysis on a simple oscillator model, show advantages of the push -push topologies with respect to other direct synthesis and frequency-doubler-based techniques. Our analysis suggests that a 9dB improvement in phase noise level is obtained when using a push-push oscillator architecture in comparison with a direct frequency synthesis oscillator developed under the same conditions (same active device, resonat or, etc...). Simulations of different oscillator topologies, which confirm the proposed theory, are provided in the paper.
Practical considerations on Low-Phase-Noise Oscillator Design
VANNINI, Giorgio;
2002
Abstract
In this paper some considerations on different oscillator topologies are presented with the aim of analyzing their behavior and determining what are good choices to synthesize a reference signal at a given frequency with low phase noise level. Preliminary results, obtained by means of a "pushing factor"-based analysis on a simple oscillator model, show advantages of the push -push topologies with respect to other direct synthesis and frequency-doubler-based techniques. Our analysis suggests that a 9dB improvement in phase noise level is obtained when using a push-push oscillator architecture in comparison with a direct frequency synthesis oscillator developed under the same conditions (same active device, resonat or, etc...). Simulations of different oscillator topologies, which confirm the proposed theory, are provided in the paper.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
