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Digital quadrature demodulator with four phases mixing for digital radio receivers

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2 Author(s)
Bravo, A. ; Dept. of Teoria de Senal y Comunicaciones, Univ. de Alcala, Madrid, Spain ; Cruz-Roldan, F.

A digital quadrature demodulator is proposed that gives the complex components of the received signal. The adoption of a modulated local oscillator (LO) with four periodic phase states synchronized with the sampling avoids the use of two mixing paths, simplifying the radio-frequency (RF) circuits and allowing an effective VLSI integration. This receiver minimizes the in-phase/quadrature (I/Q) mismatch and, with an adequate choice of the periodic modulating sequence, avoids the direct current (dc) offset of the direct conversion receivers.

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Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:50 ,  Issue: 12 )