By Johan Janssens
CMOS mobile Receiver Front-Ends: From Specification to attention bargains with the layout of the obtain course of a highly-integrated CMOS mobile transceiver for the GSM-1800 mobile process. the full layout trajectory is roofed, ranging from the records describing the traditional all the way down to the systematic improvement of CMOS receiver ICs that comply to the traditional. The layout of CMOS receivers is tackled in any respect abstraction degrees: from structure point, through circuit point, all the way down to the machine point, and the wrong way round. * various receiver architectures are in comparison with recognize to integratability, available functionality and required development block requisites. * the necessities of the GSM-1800 usual are mapped onto a collection of measurable requisites for a highly-integrated low-IF receiver and disbursed one of the various development blocks. * numerous circuit topologies are offered that discover the most features of the obtain course. The dynamics of the uncomplicated requisites of those circuits are defined when it comes to the working element of the concerned units. anyplace attainable, this is often performed utilizing analytical expressions. according to those insights, certain sizing approaches are built to systematically dimension those RF circuits for a suite of requirements. * The feasibility of assembly the necessities of brand new high-end mobile criteria is validated in a mainstream submicron CMOS expertise through the improvement of 2 highly-integrated GSM-1800 receivers. The theoretical center of the publication discusses the basic and extra complicated facets of RF CMOS layout. It focuses in particular on allaspects of the layout of high-performance CMOS low-noise amplifiers.
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Extra info for Cmos Cellular Receiver Front-Ends
E. ) is essentially identical. The only difference lies in the requirements for the radio interface1. Although DCS-1800 is considered a digital system — using digital information coding and a digital control protocol —, its physical layer still consists of an analog radio interface; The allocated frequency bands are 1710-1785 GHz and 1805-1880 GHz, of which the lower band is used for transmitting and the higher band is used for receiving (Fig. 1). 7. Team LRN 12 The DCS-1800 Communication System Frequency-division multiple access (FDMA) and time-division multiple access (TDMA) techniques are adopted in order to allow a maximum number of users in the cell accessing the network.
E. g. in QPSK). One of the most important properties of both GMSK and MSK is that they are constant envelope modulation techniques. g. a Class-E PA) can be used in the transmitter part without generating too much interference in the adjacent channels. In practice there remains a trade-off between out-ofchannel radiation (so-called spectral regrowth) and the steepness of the PA ramp-up/down. To alleviate this trade-off, adjacent carrier frequencies are often not used at the same time, giving rise to a chess-board pattern in the cell PSD.
E. the parasitic signal which is folded onto the wanted signal and ideally is removed after down-conversion by combining the quadrature paths — is suppressed. Evidently, this factor must be large enough in order not to distort the wanted signal. The image rejection specification can be derived from the DCS-1800 reference interference specification in [ETSI, p. 3]. This specification requires that the so-called reference interference performance — basically a minimum BER of 4 % [ETSI, p. 3] — must be guaranteed in the presence of co-channel and adjacent channel interference.
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