Analysis and Design of IF and RF Circuits for SDR Receivers; . : Anti-aliasing Pre-filters, Accurate and Low-noise Quadrature LO Generation and Injection-locked Dividers

Ahmad Mirzaei

ISBN 10: 3639083601 / ISBN 13: 9783639083606

Editore: VDM Verlag Dr. Müller, VDM Verlag Dr. Müller E.K., 2008

Neuware - The proliferation of bands and modulation formatscalls for a universal software-defined radio (SDR)receiver. This digitizes the received waveforms assoon as possible to relegate most of thefunctionality to DSP. In order to use low-cost ADCs,we envisage the SDR receiver as a signal conditionerwhich emphasizes the desired channel and de-emphasizes the rest. This approach requires clock-programmable built-in anti-aliasing pre-filters thatattenuate interferers to the extent that ADC canresolve the wanted signal and residual blockerswithout being overloaded. Most of this work is todesign and implement such IF filters. In the rest, acomplete portrait of LC quadrature oscillator (QOSC)based on injection locking is offered. It is shownthat inserting 90 degrees phase-shifters between thetwo oscillator cores of the QOSC results in a single-mode oscillation with superior phase-noise andminimum sensitivity to mismatches. Finally, the ideaof progressive multiple-node injection is describedas a method to widen the lock-range of injection-locked dividers. Codice articolo 9783639083606

Riassunto:

The proliferation of bands and modulation formats calls for a universal software-defined radio (SDR) receiver. This digitizes the received waveforms as soon as possible to relegate most of the functionality to DSP. In order to use low-cost ADCs, we envisage the SDR receiver as a signal conditioner which emphasizes the desired channel and de- emphasizes the rest. This approach requires clock- programmable built-in anti-aliasing pre-filters that attenuate interferers to the extent that ADC can resolve the wanted signal and residual blockers without being overloaded. Most of this work is to design and implement such IF filters. In the rest, a complete portrait of LC quadrature oscillator (QOSC) based on injection locking is offered. It is shown that inserting 90 degrees phase-shifters between the two oscillator cores of the QOSC results in a single- mode oscillation with superior phase-noise and minimum sensitivity to mismatches. Finally, the idea of progressive multiple-node injection is described as a method to widen the lock-range of injection- locked dividers.

Dati bibliografici

Titolo: Analysis and Design of IF and RF Circuits ...
Casa editrice: VDM Verlag Dr. Müller, VDM Verlag Dr. Müller E.K.
Data di pubblicazione: 2008
Legatura: Taschenbuch
Condizione: Neu