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High-efficiency line driver

  • US 6,665,399 B1
  • Filed: 03/25/1999
  • Issued: 12/16/2003
  • Est. Priority Date: 03/25/1999
  • Status: Expired due to Fees
First Claim
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1. A line driver, comprising:

  • an amplifier having an input for connection to a voltage source and having an output;

    a transformer having a first winding and a second winding, the first winding having a first end connected to the output of the amplifier and having a second end, the second winding being connectable to a transmission line having a characteristic impedance;

    a reference resistor having an end connected to the second end of the first winding at a junction point; and

    a feedback circuit connected to the input of the amplifier, to the output of the amplifier and to the junction point;

    wherein the reference resistor has a resistance equal to {fraction (1/K)} times the characteristic impedance of the transmission line and wherein the feedback circuit is arranged to produce a voltage at the output of the amplifier substantially equal to −

    (K−

    1) times the voltage at the junction point, for a predetermined value of K.

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