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Fully differential line driver circuit having common-mode feedback

  • US 5,381,112 A
  • Filed: 09/22/1993
  • Issued: 01/10/1995
  • Est. Priority Date: 09/22/1993
  • Status: Expired due to Fees
First Claim
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1. A line driver circuit, comprising:

  • a first differential amplifier having first and second input terminals for receiving first and second input signals, and having first and second output terminals for providing first and second intermediate signals;

    a first common-mode control circuit having first and second input terminals coupled to the first and second input terminals of the first differential amplifier, respectively, for sensing a common-mode voltage of the first and second input signals, and controlling a common-mode voltage of the first and second intermediate signals;

    a second differential amplifier having first and second input terminals for receiving the first and second input signals, and having first and second output terminals for providing third and fourth intermediate signals;

    a second common-mode control circuit having first and second input terminals coupled to the first and second input terminals of the second differential amplifier, respectively, for sensing the common-mode voltage of the first and second input signals, and controlling a common-mode voltage of the third and fourth intermediate signals;

    a first output driver stage having first and second transistors coupled in series for receiving the first intermediate signal and the third intermediate signal, and for providing a first output signal at a first output node between the first and second transistors; and

    a second output driver stage having third and fourth transistors coupled in series for receiving the second intermediate signal and the fourth intermediate signal, and for providing a second output signal at a second output node between the third and fourth transistors.

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