By Lucien Breems, Johan H. Huijsing
This article describes the layout and thought 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 facets of sigma-delta modulators, that are extremely important requisites to be used in battery operated receivers.
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Additional resources for Continuous Time Sigma Delta Modulation for A d Conversion in Radio Receivers Volume 634 (The Springer International Series in Engineering and Computer Science)
C. Vaucher, “A global car radio IC with inaudible signal quality checks,” ISSCC Dig. Tech. Papers, pp. 130-131, Feb. 1998. J. H. 8mW CMOS Modulator for Mobile Communication,” Proc. 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.
Furthermore, the modulator is supposed to be differential (no even order harmonics) and if the harmonic is the dominant non-linearity, Eq. (3-11) simplifies into The error voltage is the difference between a sinusoidal (input) signal and a rectangular (DAC) signal (in the case of a single-bit DAC). In mathematical terms the error signal is where is the input amplitude, is the input signal frequency and is the reference level of the DAC. Keeping in mind that the second harmonic distortion term of the DAC signal is a positive constant and that the third harmonic is equal to the ground harmonic, the third harmonic of Eq.
3]. These issues are discussed in detail in chapter 3. It was shown in the previous sections that digital integration of filters and mixers, in respect to a traditional receiver with baseband A/D converters, results in tough linearity, dynamic range, and bandwidth requirements. In addition, these requirements are much more difficult to meet at intermediate frequencies, let alone radio frequencies. 2) would require a more difficult and less optimal A/D converter in terms of performance and power consumption.
Continuous Time Sigma Delta Modulation for A d Conversion in Radio Receivers Volume 634 (The Springer International Series in Engineering and Computer Science) by Lucien Breems, Johan H. Huijsing