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A 13-bit bandpass sigma delta modulator for 10.7MHz digital IF with a 40MHz sampling rate

  • Jurgen van Engelen

Abstract

This paper presents a sixth-order continuous-time bandpass sigma delta modulator (SDM) for analog-to-digital conversion of 10.7MHz intermediate frequency (IF) signals in AM/FM broadcast radio receivers. Sampled at 40MHz, the single-loop one-bit SDM achieves 67dB SNDR in 200kHz and 80dB in 9kHz. The third order intermodulation (IM3) is at -82dBc for a -10dBFS input level. The 0.5μm CMOS chip occupies 0.9×0.4mm2 and consumes 60mW at 3.3V (digital) and 5.0V (analog). The sample frequency is variable and can be set from 30MHz to 80MHz.

Keywords

Tuning Frequency Automatic Gain Control Loop Filter Radio Receiver Sigma Delta Modulator 
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Copyright information

© Springer Science+Business Media New York 2000

Authors and Affiliations

  • Jurgen van Engelen
    • 1
  1. 1.Broadcom CorporationIrvineUSA

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