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Low comment mode impedence differential driver and applications thereof

  • US 6,118,438 A
  • Filed: 04/07/1999
  • Issued: 09/12/2000
  • Est. Priority Date: 03/18/1997
  • Status: Expired due to Term
First Claim
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1. A low common mode impedance differential driver comprises:

  • an independent current source;

    a switching module operably coupled to the independent current source, wherein taps in the switching module provide a differential output from an input;

    a dependent current source operably coupled to the switching module; and

    a bias control circuit operably coupled to the differential output and the dependent current source, wherein the bias control circuit provides a control signal to the dependent current source, which causes common mode of the differential output to be maintained within a desired tolerance.

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