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Transmitter and method for transmitting a modulated wave with variable envelope

  • US 5,784,412 A
  • Filed: 12/06/1995
  • Issued: 07/21/1998
  • Est. Priority Date: 12/06/1994
  • Status: Expired due to Term
First Claim
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1. A transmitter comprising:

  • means for converting a signal of said modulating signal with envelope variation of which in-phase component signal is I and quadrature component signal is Q to a signal of which in-phase component signal is I1, and quadrature component signal is Q1 and a signal of which in-phase component signal is I2, and quadrature component signal is Q2 that meet the following conditions (1) to (3);

    
    
    space="preserve" listing-type="equation">(I.sub.1).sup.2 +(Q.sub.1).sup.2 =constant (1)
    
    
    space="preserve" listing-type="equation">(I.sub.2).sup.2 +(Q.sub.2).sup.2 =constant (2)
    
    
    space="preserve" listing-type="equation">Vector (I,Q)=Vector (I.sub.1,Q.sub.1)+Vector (I.sub.2,Q.sub.2) (3)a first modulation means for modulating a carrier with said signal (I1,Q1) and generating a first modulated wave;

    a second modulation means for modulating a carrier with said signal (I2,Q2) and generating a second modulated wave;

    a first amplification means for power amplifying said first modulated wave;

    a second amplification means for power amplifying said second modulated wave; and

    means for composing output signals of said first amplification means and said second amplification means.

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