Title :
Oscillator pulling and synchronisation issues in self-oscillating class D power amplifiers
Author :
Piessens, Tim ; Steyaert, Michiel
Author_Institution :
ESAT-MICAS, Leuven, Belgium
Abstract :
Oscillator pulling towards synchronisation is one of the most important parasitic effects of a self-oscillating non-linear system. Although mostly unwanted, it can be used in self-oscillating power amplifiers (SOPA) as an inherent filtering function of the mean switching frequency. This paper describes a mathematical model to calculate the dominant oscillation mode in coupled self-oscillating power amplifiers and quantifies the major design criteria for the wanted oscillation mode. The obtained results were verified by a prototyped SOPA in a 0.35 /spl mu/ CMOS technology. The first inter-modulation band was completely suppressed, relaxing the filter requirements with 20dB of stopband attenuation at twice the frequency, compared with a single ended class D amplifier.
Keywords :
CMOS integrated circuits; integrated circuit modelling; oscillators; power amplifiers; synchronisation; 0.35 micron; CMOS technology; SOPA; class D power amplifiers; dominant oscillation mode; inherent filtering function; intermodulation band; mathematical model; mean switching frequency; oscillator pulling; oscillator synchronisation; parasitic effects; self-oscillating nonlinear system; self-oscillating power amplifiers; stopband attenuation; Attenuation; CMOS technology; Filtering; Filters; Frequency synchronization; Mathematical model; Oscillators; Power amplifiers; Prototypes; Switching frequency;
Conference_Titel :
Solid-State Circuits Conference, 2003. ESSCIRC '03. Proceedings of the 29th European
Conference_Location :
Estoril, Portugal
Print_ISBN :
0-7803-7995-0
DOI :
10.1109/ESSCIRC.2003.1257189
