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Method and apparatus for automatic equalization of very high frequency multilevel and baseband codes using a high speed analog decision feedback equalizer

  • US 6,047,026 A
  • Filed: 09/30/1997
  • Issued: 04/04/2000
  • Est. Priority Date: 09/30/1997
  • Status: Expired due to Fees
First Claim
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1. A decision feedback equalizer circuit comprising:

  • a voltage-to-current converter for receiving a voltage input signal and converting said voltage input signal to a current input signal;

    a current mode finite impulse response filter coupled to said voltage-to-current converter for adding positive and negative current increments to said current input signal at selected times to produce an equalized current signal;

    a positive slicer block coupled to said current mode finite impulse response filter for detecting when said equalized current signal achieves a positive threshold current level and, upon such detection, providing via a first delay line a plurality of negative tap enable signals at a plurality of predetermined delay times to said current mode finite impulse response filter;

    a negative slicer block coupled to said current mode finite impulse response filter for detecting when said equalized current signal achieves a negative threshold current level and, upon such detection, providing via a second delay line a plurality of positive tap enable signals at a plurality of predetermined delay times to said current mode finite impulse response filter; and

    a current-to-voltage converter coupled to said current mode finite impulse response filter for converting said equalized current signal to an equalized voltage signal.

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