By Jan Crols, Michiel Steyaert (auth.)
The international of instant communications is altering very quickly considering the fact that many years. The creation of electronic facts verbal exchange together with electronic sign procedure ing has created the basis for the advance of many new instant functions. top of the range electronic instant networks for voice conversation with international and native assurance, just like the GSM and DECT procedure, are just faint and early examples of the wide range of instant purposes that might develop into to be had within the rest of this decade. the recent evolutions in instant communications set new standards for the trans ceivers (transmitter-receivers). greater working frequencies, a reduce energy consump tion and a truly excessive measure of integration, are new requisites which ask for layout ways particularly diverse from the classical RF layout concepts. The integrata bility and gear intake relief of the electronic half will additional enhance with the continuing downscaling of applied sciences. this is often even if different for the analog transceiver front-end, the half which plays the interfacing among the antenna and the electronic sign processing. The analog front-end's integratability and tool intake are heavily relating to the actual boundaries of the transceiver topology and never loads to the scaling of the used expertise. bankruptcy 2 supplies an in depth learn of the extent of integration in present transceiver attention and analyzes their barriers. In bankruptcy three of this ebook the advanced sign process for the research and synthesis of multi-path receiver and transmitter topologies is introduced.
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Extra resources for CMOS Wireless Transceiver Design
31 gives the phase error caused by pole mismatch in function of frequency. ¢) ~ · . 34) These three sources of frequency crosstalk are plotted versus frequency in fig. 17. The curves of fig. 17 are given for a 1 % mismatch on each component. From fig. e. capacitor mismatch does not result in amplitude errors. • Phase errors are caused by resistor and capacitor mismatch. They occur however only at the edge of the passband, meaning that when the filter's passband is larger than the wanted signal band, the phase mismatch is greatly reduced.
The power spectral density of the parasitic baseband signal caused by RF-to-LO crosstalk. 3 CMOS WIRELESS TRANSCEIVER DESIGN Combined Architectures The zero-IF receiver topology is, due to its direct downconversion topology, highly sensitive to parasitic baseband signals. It is for this reason that the zero-IF receiver has been used until now in only a very limited number of realizations [Rab ACD93, Min CICC94]. Today, the receiver topology that is most commonly used for newly introduced applications in the 900 MHz to 2 GHz range is the combined IF zero-IF topology [Stetz ISSCC95, Marsh ISSCC95].
The quality of multi-path signal processing depends heavily on how good the parallel operations in each path are matched with each other. In digital systems this matching can be perfect, in analog systems a perfect matching is impossible. In this chapter, the complex signal technique is therefore extended for the analysis of analog multipath system and a technique which includes the effects of path mismatch is proposed. The complex signal technique for analog signal processing will be used to analyze the zero-IF topology, the most obvious analog multi-path system.