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 variety, linearity and tool potency elements of sigma-delta modulators, that are extremely important requisites to be used in battery operated receivers.
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Extra 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)
For reasons of cost, size and complexity reduction, an important trend in receiver design is digital integration of analog functionality, such as mixers and filters. Shifting the A/D converter towards the antenna side of the receiver results in tough requirements regarding dynamic range and linearity. These requirements are more difficult to meet at higher frequencies, due to circuit non-idealities and parasitic effects. 2-2 have the most relaxed requirements. This is because interference signals have been filtered out by the channel filter and the desired channel is modulated down to DC or a low-IF frequency.
Tech. Papers, pp. 50-51, Feb. 1999. , B. 8µm CMOS,” IEEE J. Solid-State Circuits, vol. 32, pp. 783796, June 1997. , “Continuous-time analog integrated filters,” in Integrated Continuous-Time Filters, IEEE Press, New York, 1993. , “Single sideband modulation using sequence asymmetric polyphase networks,” Elect. , vol. 48, pp. 2125, 1973. 20] Crols, J. J. Steyaert, “A Single-Chip 900 MHz CMOS Receiver Front-End with a High Performance Low-IF Topology,” IEEE J. Solid-State Circuits, vol. 30, pp. 1483-1492, Dec.
13]. 2] that may have unbounded states. 15] which are valuable for higher-order modulator design. 17]. With this linear model the root locus method can be applied to analyze the linearized system for stable limit cycles. First, stability of a modulator in the case of a small input signal is discussed, followed by the large signal stability analysis. 1 Small signal stability Fig. 3-15 shows a linear model of a continuous-time (CT) modulator. The system consists of a CT loopfilter with transfer function H(s) and a sampled quantizer.