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Common mode early voltage compensation subcircuit for current driver

  • US 5,592,510 A
  • Filed: 03/29/1994
  • Issued: 01/07/1997
  • Est. Priority Date: 03/29/1994
  • Status: Expired due to Term
First Claim
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1. A driver circuit comprising:

  • driving circuitry driving differential signals over a twisted pair cable and driving common mode current signals containing information over said twisted pair cable, said driving circuitry comprising driving transistors and having a bias voltage, said driving transistors coupled to said twisted pair cable; and

    a subcircuit coupled to said driving circuitry and modifying an effective common mode early voltage characteristic of said driving transistors in response to variations in said bias voltage from a reference voltage level, said subcircuit effectively reducing common mode current flow over said twisted pair cable in response to variations of said bias voltage from said reference voltage level.

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