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Multi level comparator for demodulator

  • US 6,173,018 B1
  • Filed: 11/20/1997
  • Issued: 01/09/2001
  • Est. Priority Date: 11/28/1996
  • Status: Expired due to Fees
First Claim
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1. In a demodulator circuit for obtaining output data through comparison, made in a multi-level comparator, of a signal obtained by subjecting a received signal to a process of detection in a detector circuit and predetermined threshold levels, a control circuit of threshold levels for said multi-level comparator in said demodulator circuit comprising:

  • a level detector circuit for detecting the level of said received signal transmitted through the process of detection; and

    a control circuit for controlling relative magnitudes of the level detected in said level detector circuit of the signal transmitted through the process of detection and the predetermined threshold levels for said multi-level comparator, wherein at least one of the predetermined threshold levels controlled by said control circuit is used for applying feedback control to the detector circuit to handle deviations in an input frequency (IF).

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