Modeling and Analysis of PSRR in Analog PWM Class D Amplifiers

kimi_cxl · 发表于 2011-7-27 17:00:38

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Modeling and Analysis of PSRR in Analog PWM Class D Amplifiers

简介：
Abstract - In this paper, we propose and derive a linear model of a closed-loop PWM Class D Amplifier (CDA) to
model its Power Supply Rejection Ratio (PSRR). On the basis of the proposed model, we derive a simple expression
that depicts the effects of 3 critical parameters on PSRR: the gain of the integrator, the gain of the PWM stage and the
feedback factor. We recommend, from a practical viewpoint，that the first and third parameters be increased if higher
PSRR is desired. We validate our model and analysis on the basis of HSPICE simulations and on experimental
measurements. Our model and analysis are useful as they provide insight to a CDA designer, in particular how various
parameters may be varied/compromised to meet a given set of PSRR specifications.

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