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Driver circuit with output common mode voltage control

  • US 6,429,700 B1
  • Filed: 04/17/2001
  • Issued: 08/06/2002
  • Est. Priority Date: 04/17/2001
  • Status: Active Grant
First Claim
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1. A driver circuit having a minimized output common mode voltage, the driver circuit comprising:

  • a differential amplifier having a passive element as a biasing source for establishing a bias current in the differential amplifier;

    a control amplifier operatively coupled to the differential amplifier in a feedback arrangement, the control amplifier generating a control signal; and

    a common mode amplifier including first and second inputs forming a differential input of the driver circuit, the common mode amplifier being operatively coupled to an output of the control amplifier and having at least one output coupled to an input of the differential amplifier, the common mode amplifier at least partially establishing an output common mode voltage of the driver circuit at a predetermined voltage level in response to the control signal from the control amplifier;

    wherein the differential amplifier is responsive to the control signal for providing a common mode voltage at an output of the driver circuit that is substantially independent of an input signal presented to the differential input of the driver circuit.

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