A 10.7MHz IF-to-baseband sigma delta A/D conversion system for AM/FM radio receivers

E.J. Zwan, van der, K.J.P. Philips, C.A.A. Bastiaansen

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S¿ modulation with integrated quadrature mixing is used for analog-to-digital (A/D) conversion-of a 10.7-MHz IF input signal in an AM/FM radio receiver. After near-zero IF mixing to a 165 kHz offset frequency, the I and Q signals are digitized by two fifth-order, 32 times oversampling continuous-time S¿ modulators. A prototype IC includes digital filters for decimation and the shift of the near-zero-IF to dc. The baseband output signal has maximum carrier-to-noise ratios of 94 dB in 9 kHz (AM) and 79 dB in 200 kHz (FM), with 97 and 82 dB dynamic range, respectively. The IM3 distance is 84 dB at full-scale A/D converter input signal. Including downconversion and decimation filtering, the IF A/D conversion system occupies 1.3 mm2 in 0.25-µm standard digital CMOS. The S¿ modulators consume 8 mW from a 2.5-V supply voltage, and the digital filters consume 11 mW
Originele taal-2Engels
Pagina's (van-tot)1810-1819
Aantal pagina's10
TijdschriftIEEE Journal of Solid-State Circuits
Nummer van het tijdschrift12
StatusGepubliceerd - 2000


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