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Pseudo-differential output driver with high immunity to noise and jitter

  • US 7,622,957 B2
  • Filed: 02/21/2008
  • Issued: 11/24/2009
  • Est. Priority Date: 05/25/2005
  • Status: Active Grant
First Claim
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1. A circuit for transmitting an output signal, said circuit comprising:

  • a first impedance operative to receive a first voltage, wherein said first impedance comprises first resistor circuitry whose resistance is adjustable responsive to a voltage of a first resistance control signal;

    switching circuitry coupled to said first impedance, said switching circuitry comprising a first path and a second parallel path, said switching circuitry operative to receive first and second differential input signals at said first and second paths, respectively, and to generate said output signal at a node in only one of said paths, without generating another output signal in another of said paths, in response to receipt of said first and second differential input signals; and

    a second impedance coupled to said switching circuitry and operative to receive a second voltage, wherein said second impedance comprises second resistor circuitry whose resistance is adjustable responsive to a voltage of a second resistance control signal.

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