A digital coherent-downconverter configuration is described whose operation principle is based on the theory of subharmonic sampling for narrowband waveforms. This configuration uses a fast sampler, operating at microwave frequencies, for directly demodulating the in-phase and quadrature components of a complex input waveform, yielding a sampled sequence in a suitable format for subsequent analogue-to-digital conversion. Unlike the conventional double-conversion coherent superheterodine architecture, the proposed configuration offers attractive features in terms of cost and complexity and appears particularly suitable for the implementation of the front-end unit in a coherent receiver. An experimental prototype, based on a very fast GaAs MMIC sample-and-hold (SH) circuit, has been implemented for validating the operation principle. Complex demodulation of a 1 GHz input waveform is demonstrated, with 6-bit equivalent accuracy.

S-band digital downconverter for radar applications based on a GaAs MMIC fast sample-and-hold / Ayitabile, G; Cidronali, A.; Manes, G.. - In: IEE PROCEEDINGS. CIRCUITS, DEVICES AND SYSTEMS. - ISSN 1350-2409. - STAMPA. - 143(1996), pp. 337-342.

S-band digital downconverter for radar applications based on a GaAs MMIC fast sample-and-hold

CIDRONALI, ALESSANDRO;MANES, GIANFRANCO
1996

Abstract

A digital coherent-downconverter configuration is described whose operation principle is based on the theory of subharmonic sampling for narrowband waveforms. This configuration uses a fast sampler, operating at microwave frequencies, for directly demodulating the in-phase and quadrature components of a complex input waveform, yielding a sampled sequence in a suitable format for subsequent analogue-to-digital conversion. Unlike the conventional double-conversion coherent superheterodine architecture, the proposed configuration offers attractive features in terms of cost and complexity and appears particularly suitable for the implementation of the front-end unit in a coherent receiver. An experimental prototype, based on a very fast GaAs MMIC sample-and-hold (SH) circuit, has been implemented for validating the operation principle. Complex demodulation of a 1 GHz input waveform is demonstrated, with 6-bit equivalent accuracy.
143
337
342
Ayitabile, G; Cidronali, A.; Manes, G.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2158/1076089
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