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• W2103165306 endingPage "1934" @default.
• W2103165306 startingPage "1920" @default.
• W2103165306 abstract "Oversampled bandpass A/D converters based on sigma-delta (/spl Sigma//spl Delta/) modulation can be used to robustly digitize the types of narrowband intermediate frequency (IF) signals that arise in radios and cellular systems. This paper proposes a two-path architecture for a fourth-order, bandpass modulator that is more tolerant of analog circuit limitations at high sampling speeds than conventional implementations based on the use of switched-capacitor biquadratic filters. An experimental prototype employing the two-path topology has been integrated in a 0.6-/spl mu/m, single-poly, triple-metal CMOS technology with capacitors synthesized from a stacked metal structure. Two interleaved paths clocked at 40 MHz digitize a 200-kHz bandwidth signal centered at 20 MHz with 75 dB of dynamic range while suppressing the undesired mirror image signal by 42 dB. At low input signal levels, the mixing of spurious tones at DC and f/sub s//2 with the input appears to degrade the performance of the modulator; out-of-band sinusoidal dither is shown to be an effective means of avoiding this degradation. The experimental modulator dissipates 72 mW from a 3.3 V supply." @default.
• W2103165306 created "2016-06-24" @default.
• W2103165306 creator A5057991756 @default.
• W2103165306 creator A5062244592 @default.
• W2103165306 date "1997-01-01" @default.
• W2103165306 modified "2023-10-15" @default.
• W2103165306 title "A two-path bandpass ΣΔ modulator for digital IF extraction at 20 MHz" @default.
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• W2103165306 doi "https://doi.org/10.1109/4.643650" @default.
• W2103165306 hasPublicationYear "1997" @default.
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