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Complementary pair-configured telecommunication line driver having synthesized output impedance

  • US 6,359,505 B1
  • Filed: 12/19/2000
  • Issued: 03/19/2002
  • Est. Priority Date: 12/19/2000
  • Status: Expired due to Term
First Claim
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1. A driver amplifier circuit comprising:

  • a first operational amplifier having first and second differential polarity inputs and an output, said first differential polarity input of said first operational amplifier being coupled to a first reference potential terminal;

    a first input resistor coupling said second differential polarity input of said first operational amplifier to a first of complementary input terminals to which an input signal is applied;

    a first negative feedback resistor coupled between said output and said second input of said first operational amplifier;

    a first output resistor coupled between said output of said first operational amplifier and a first output terminal to which a load being driven is coupled;

    a second operational amplifier having first and second differential polarity inputs and an output, said first differential polarity input of said second operational amplifier being coupled to said first reference potential terminal;

    a second input resistor coupling said second differential polarity input of said second operational amplifier to a second of said complementary input terminals;

    a second negative feedback resistor coupled between said output and said second input of said second operational amplifier;

    a second output resistor coupled between said output of said second operational amplifier and second output terminal to which said load is coupled;

    a first positive feedback resistor cross-coupled between said first output terminal and said second differential polarity input of said second operational amplifier; and

    a second positive feedback resistor cross-coupled between said second output terminal and said second differential polarity input of said first operational amplifier.

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