Download Continuous Time Sigma Delta Modulation for A d Conversion in by Lucien Breems, Johan H. Huijsing PDF

By Lucien Breems, Johan H. Huijsing

This article describes the layout and conception of continuous-time sigma-delta modulators for analogue-to-digital conversion in radio receivers. The book's major concentration is on dynamic diversity, linearity and tool potency features of sigma-delta modulators, that are extremely important standards to be used in battery operated receivers.

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Read or Download Continuous Time Sigma Delta Modulation for A d Conversion in Radio Receivers Volume 634 (The Springer International Series in Engineering and Computer Science) PDF

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Additional info for Continuous Time Sigma Delta Modulation for A d Conversion in Radio Receivers Volume 634 (The Springer International Series in Engineering and Computer Science)

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These periodic quantization errors occur as discrete peaks in the frequency spectrum with input signal dependent frequencies. 2] where n is an integer, is the sampling frequency, is the DC offset voltage and is the quantization step size. This phenomenon has been simulated with a model of a fourth-order 1-bit sigma-delta modulator. Fig. 96 MHz sampling frequency. Fig. 3-3 reveals that the quantization error is clearly not a random signal but, on the other hand, that periodic sequences are not easily recognized.

The digital output signal is subtracted from the analog input via a D/A converter in the feedback path. The error E due to the quantization process is the difference between the analog quantizer input signal and the quantized output. Suppression of the quantization error in a modulator is provided by two mechanisms: oversampling of the signal bandwidth and shaping of the noise by the loopfilter. Because the reduction of the quantization error by these mechanisms is so effective, a high-resolution digital output is obtained, using only a low-resolution quantizer.

Sedra, “Quadrature Bandpass Modulation for Digital Radio,” IEEE J. Solid-State Circuits, vol. 32, pp. 1935-1950, Dec. 1997. M. 7 MHz,” IEEE J. Solid-State Circuits, vol. 30, pp. 184-192, March 1995. , “A Fourth-Order Bandpass Delta-Sigma Modulator with Reduced Number of Op Amps,” IEEE J. Solid-State Circuits, vol. 30, pp. 1309-1315, Dec. 1995. A. Wooley, “A Two-Path Bandpass Digital IF Extraction at 20 MHz,” IEEE J. Solid-State Circuits, vol. 32, pp. 1920-1934, Dec. 1997. , “An 81 MHz IF Receiver in CMOS,” ISSCC Dig.

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