×

Active hybrid circuit

  • US 3,970,805 A
  • Filed: 02/22/1974
  • Issued: 07/20/1976
  • Est. Priority Date: 02/22/1974
  • Status: Expired due to Term
First Claim
Patent Images

1. An active hybrid circuit comprisingan input terminal for receiving input signals;

  • receiving amplifier means having an input connection coupled to said input terminal and having two output connections for producing therebetween a differential output of the signals applied at the input connection;

    two common terminals for connecting a transmitting and receiving unit thereto;

    said output connections of the receiving amplifier means being coupled to said common terminals, whereby input signals received at the input terminal and amplified to produce a differential output by the receiving amplifier means are applied to the transmitting and receiving unit;

    transmitting amplifier means having two input connections for receiving a differential input and having an output connection;

    said input connections of the transmitting amplifier means being coupled to said common terminals, whereby signals being transmitted by the transmitting and receiving unit are applied to the transmitting amplifier means and amplified transmitted signals are produced at the output connection of the transmitting amplifier means; and

    compensating means coupled to the input terminal and directly to a first of said two input connections of the transmitting amplifier means;

    said compensating means includingfirst circuit means including impedance means connected between said input terminal and a connection point,second circuit means including impedance means connected between said connection point and said first input connection of the transmitting amplifier means, andthird circuit means including impedance means connected between said connection point and a point of reference potential;

    said compensating means being operable in response to a signal at the input terminal to produce a signal at said first input connection of the transmitting amplifier means causing the transmitting amplifier means to produce at its output connection a signal which is substantially equal and of opposite polarity to the signal produced at its output connection in response to the same input signal amplified by the receiving amplifier means, coupled to the transmitting amplifier means, and amplified by the transmitting amplifier means, whereby substantially none of a signal received at the input terminal appears at the output connection of the transmitting amplifier means.

View all claims
  • 8 Assignments
Timeline View
Assignment View
    ×
    ×