CMOS cellular receiver front-ends : from specification to 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 approach. the full layout trajectory is roofed, ranging from the records describing the traditional 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, right down to the gadget point, and the opposite direction round.

The theoretical center of the booklet discusses the elemental and extra complex elements of RF CMOS layout. It focuses particularly on all elements of the layout of high-performance CMOS low-noise amplifiers.

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Extra info for CMOS cellular receiver front-ends : from specification to realization

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In addition, a high performance LNA for the Global Positioning System has been fabricated. The detailed design procedures along with the measurement results are also reported in this text. A brief summary of their main characteristics is presented next. • A CMOS DCS-1800 receiver prototype, the receive path of the single-chip transceiver presented at ISSCC 1998. This transceiver was — to the author’s knowledge — the first transceiver demonstrating the feasibility of achieving cellular specifications in CMOS.

Since path mismatch becomes extremely important at all frequencies, the quadrature local oscillator, the down-conversion mixers as well as the low-frequency filters/VGAs need to be designed very carefully. At first sight the required image rejection for a zero-IF system appears to be much lower than the required rejection in a low-IF system (Fig. 4). After all, in a zero-IF system the power of the mirror signal only is a folded version of the wanted channel and hence has exactly the same power, whereas in a low-IF system, the — possibly 18 dB stronger — adjacent channel is mirrored onto the wanted channel.

These properties make a zero-IF and low-IF receiver a very attractive solution. 2 Cellular Receiver Architectures 27 However, the reception is distributed over two independent paths. This puts a lot of requirements on symmetry because the image rejection critically relies on that symmetry. Indeed, all amplitude and phase errors result in a limited image suppression so that the image is partly leaking through and affects the wanted signal. Since path mismatch becomes extremely important at all frequencies, the quadrature local oscillator, the down-conversion mixers as well as the low-frequency filters/VGAs need to be designed very carefully.

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