CMOS Cellular Receiver Front-Ends (The Springer by Johan Janssens

By Johan Janssens

CMOS mobile Receiver Front-Ends: from Specification to Realization offers with the layout of the obtain course of a highly-integrated CMOS mobile transceiver for the GSM-1800 mobile method. the whole layout trajectory is roofed, ranging from the records describing the normal right 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, all the way down to the machine point, and the wrong way round.

The theoretical middle of the e-book discusses the basic and extra complicated points of RF CMOS layout. It focuses in particular on all features of the layout of high-performance CMOS low-noise amplifiers.

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Additional info for CMOS Cellular Receiver Front-Ends (The Springer International Series in Engineering and Computer Science)

Example text

By removing these out-of-band blocking signals the dynamic range requirements of the receiver can be relaxed considerably. A low noise amplifier (LNA) boosts the weakest channels — along with the more powerful channels — above the noise floor of the first mixing stage. The receiver core consists of a cascade of n image-suppressing down-mixing stages that are converting the signal from the current IF, to a lower Before each mixing operation, an image filter (interstage filter, IF-filter) suppresses the mirror signal at In this way only a strongly attenuated version of the mirror signal is folded onto the wanted signal, preventing irreparable corruption of the information contents.

Also LO feed-through and DC offset do not affect the signal quality since the wanted channel is never close to these frequencies. The same applies to self-mixing of either LO or RF signal. The accuracy-speed-dynamic range (mismatch-bandwidth-dynamic range) trade-off is thus much less pronounced in this topology. 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.

In terms of the performance at the transistor level. Whenever possible, this is done using closed analytical expressions. Based on these insights, detailed sizing procedures are developed to systematically design these RF circuits for a set of specifications. • The feasibility of meeting the tough requirements of today’s high-end cellular standards at a reasonable power consumption is demonstrated in a mainstream submicron CMOS technology by the development of two highly integrated DCS-1800 receivers.

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