Continuous-Time Sigma-Delta Modulation for A/D Conversion in by Lucien Breems, Johan Huijsing

By Lucien Breems, Johan Huijsing

This textual content describes the layout and idea 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 gear potency points of sigma-delta modulators, that are vitally important requisites to be used in battery operated receivers.

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Extra info for Continuous-Time Sigma-Delta Modulation for A/D Conversion in Radio Receivers (The Springer International Series in Engineering and Computer Science)

Example text

Both at sample moments and the quantizer gives a positive output. At sample moment the quantizer output is negative. After four sample moments the output pattern is repetitive. 3-16) the quantizer output gives the exact same output pattern for the whole range of phases. Thus, the quantizer is not able to detect the phase of an input signal at and therefore has a phase uncertainty. At the maximum phase uncertainty is This uncertainty in phase of the quantizer is largest at In the Laplace domain, the quantizer is modeled as where is the quantizer gain and CONTINUOUS-TIME the phase shift.

Of Workshop on Circuits, Systems and Signal Processing, pp. 61-64, Nov. 1998. 4] Liu, Chia-Liang, “Impacts of I/Q imbalance on QPSK-OFDMQAM detection,” Proc. of Int. Conf. on Consumer Electronics, pp. 384-385, July, 1998. W. S. 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.

7] to the input, to decorrelate the quantization errors. This is beyond the scope of this book. So far, only baseband tones have been investigated. However, at high frequencies (near half the sampling frequency) tones are present as well and are very strong due to the lack of loopgain at those frequencies. 9]. In the case of second harmonic distortion the baseband tones occur at where and are two high frequency tones. In the case of modulation with half the sampling frequency the in-band tone will be at Fig.

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