SigmaDelta
ptolemy.domains.ct.demo.SigmaDelta.SigmaDelta

A demo of Sigma Delta quantization. The underlying model is a micro-accelerometer which uses beam-gap capacitor to measure accelerations. A second order CT subsystem is used to model the beam. The voltage on the beam-gap capacitor is sampled every T seconds (much faster than the required output of the digital signal), then filtered by a lead compensator (FIR filter), and fed to an one-bit quantizer. The outputs of the quantizer are converted to force and fed back to the beams. The outputs are also counted and averaged every N*T seconds to produce the digital output. In our example, the external acceleration is a Sin wave. Reference: Mark A. Lemkin, <I>"Micro Accelerometer Design with Digital Feedback Control"</I>, doctoral dissertation, University of California, Berkeley, Fall 1997

Author(s): Jie Liu
Version:$Id: SigmaDelta.doc.html,v 1.1 2006/02/22 18:41:22 mangal Exp $
Pt.Proposed Rating:Red (liuj)
Pt.Accepted Rating:Red (cxh)