By Johan Janssens
CMOS mobile Receiver Front-Ends: from Specification to attention bargains with the layout of the obtain direction of a highly-integrated CMOS mobile transceiver for the GSM-1800 mobile approach. the full layout trajectory is roofed, ranging from the files describing the normal all the way down to the systematic improvement of CMOS receiver ICs that comply to the normal. The layout of CMOS receivers is tackled in any respect abstraction degrees: from structure point, through circuit point, right down to the gadget point, and the wrong way round. The theoretical middle of the publication discusses the basic and extra complex facets of RF CMOS layout. It focuses in particular on all points of the layout of high-performance CMOS low-noise amplifiers.
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Additional resources for CMOS Cellular Receiver Front-Ends: from Specification to Realization (The Springer International Series in Engineering and Computer Science)
1 Structure Fig. 2 shows the generic scheme of both a zero-IF and a low-IF receiver. As is the case in the heterodyne receiver topology, the antenna signal is first passed through a band select filter, suppressing all out-of-band blocking signals and relaxing the required dynamic range. After amplification by the LNA, the signal is demultiplexed and fed to two independent signal paths. 2 Cellular Receiver Architectures 25 It has to be noted that the (external) interstage filter is not required any longer, since its function has become obsolete; both the mirror signal and the noise will eventually be ‘neutralized’ by the recombination of the two signal paths after the quadrature down-conversion.
Another important property is that the channel selection process occurs before the VGA-A/D cascade. Hence, the IF VGA and the A/D only need to handle a minimum dynamic range. Due to the bandpass nature of the channel, even a subsampling A/D can be used. Additionally, the number of bits can be kept low since both the out-of-band and the in-band blocking levels have already been removed. Precisely because critical functions are being realized by passives and need therefore not be implemented in silicon, the power consumption of these receivers can be kept low.
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. First of all, each 75 MHz band is subdivided into 372 carrier frequencies spaced 200 kHz apart (FDMA). To each base station a few carrier frequencies are assigned. These frequencies are further subdivided into elementary time slots or burst periods, containing the data (TDMA).
CMOS Cellular Receiver Front-Ends: from Specification to Realization (The Springer International Series in Engineering and Computer Science) by Johan Janssens