Mixed-signal quadrature demodulator with a multicarrierregeneration system |
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Authors: | Van Lammeren JPM Wissing RWB |
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Affiliation: | Philips Semicond., Nijmegen; |
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Abstract: | This paper presents a combined analog/digital demodulation system built around a (PLL) with digital carrier regeneration. The input signal itself is not digitized, but the PLL is digital wherever it is possible. The link between the analog and the digital domain is a 1-bit sigma-delta converter that converts the (quasi-dc) output signal of the PLL's phase detector into a bitstream. The PLL's loop filter doubles as a decimation filter for the bitstream. The analog I and Q output signals are obtained by multiplying the analog input signal with the digital output signal of the PLL in two four-quadrant multiplying digital-to-analog converters |
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