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Spectral analysis of quantization noise in a single-loop sigma-delta modulator with DC input

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1 Author(s)
Gray, R.M. ; Dept. of Electr. Eng., Stanford Univ., CA, USA

An exact discrete-time analysis of the moments and spectra of the quantization noise of a discrete-time single-loop sigma-delta modulator with a DC input is presented. An exact difference equation for the discrete-time nonlinear system is used to evaluate the first- and second-order moments and power spectrum of the binary quantizer noise and the binary quantizer output for a single-loop sigma-delta encoder with a DC input. It is shown that the sample mean and power of the binary quantization noise are consistent with the common uniform distribution assumption, but that the autocorrelation and power spectrum are not consistent with the white noise assumption. The results are used to evaluate the overall sample average mean squared quantization error as a function of the decimation filter used

Published in:

Communications, IEEE Transactions on  (Volume:37 ,  Issue: 6 )

Date of Publication:

Jun 1989

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