CMOS cellular receiver front-ends : from specification to by Johan Janssens

By Johan Janssens

CMOS mobile Receiver Front-Ends: from Specification to Realization bargains with the layout of the obtain course of a highly-integrated CMOS mobile transceiver for the GSM-1800 mobile approach. the total layout trajectory is roofed, ranging from the files describing the normal right 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.

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

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We will therefore focus on achieving the sensitivity of this class. Using Fig. 9 dB. 2 dB in a 200 kHz bandwidth. 3% for a Class 1/2 mobile station. 1, an SNR of about 7 dB must be guaranteed at the respective power levels. 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.

1. External components have been accentuated by drawing them in bold. The broadband antenna signal is fed into a highly selective bandpass filter (the pre-selector filter) which suppresses all interferers residing outside of the application band. 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 quadrature outputs of the low-IF receiver are fed to a set of complex digital mixers. 4 From DCS Standard to Receiver Specifications 31 to a quadrature signal at DC. From this moment on, the digital back-end is the same as for a zero-IF receiver. Subsequently, the signals are fed to high-order digital low-pass filters that implement the actual channel selection. The low-pass filters also remove the DC-offset, which is now positioned around 100 kHz. After applying some digital AGC, the quadrature signals are fed to a GMSK demodulator that extracts the data bits from the constellation.

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