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Sigma delta modulator having enlarged dynamic range due to stabilized signal swing

  • US 6,831,577 B1
  • Filed: 01/31/2002
  • Issued: 12/14/2004
  • Est. Priority Date: 02/02/2001
  • Status: Expired due to Term
First Claim
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1. An analog-to-digital converter comprisinga sigma-delta-modulator comprising a plurality of cascaded integrators, a comparator for signal quantization, monitoring means adapted to monitor a signal swing of an output signal of at least one of the plurality of integrators and to determine if the monitored signal swing exceeds a predefined threshold value, the predefined threshold value being associated with a maximum stable input amplitude of the sigma-delta-modulator, and controlling means adapted to reduce the output signal of at least one of the plurality of integrators by a predefined factor or value so as to bring the monitored signal swing below the predefined threshold value.

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