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Digitally implemented variable phase shifter and amplitude weighting device

  • US 5,019,793 A
  • Filed: 05/21/1990
  • Issued: 05/28/1991
  • Est. Priority Date: 05/21/1990
  • Status: Expired due to Fees
First Claim
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1. A variable phase shifter and amplitude weighting device for selectively varying the phase and amplitude of an input RF signal, RFIN, in order to thereby produce an output RF signal, RFOUT, having a selected phase and amplitude, the device including:

  • means for splitting the input RF signal, RFIN, into RF signal components A and B;

    means for selectively shifting the phase of said RF signal components A and B, to thereby produce selectively phase-shifted signal components A1 and B1;

    means for combining said selectively phase-shifted signal components A1 and B1, to thereby produce the output RF signal, RFOUT having a selected phase and amplitude; and

    wherein;

    C represents the selected amplitude, and φ

    c represents the selected phase angle of said RFOUT signal;

    φ

    a represents the phase angle of said signal component A;

    φ

    b represents the phase angle of said signal component B; and

    ,said selectively phase shifting means is adapted to phase shift said signal components A and B in accordance with the equations φ

    a

    c +cos-1 (1/2C) and φ

    b

    c -cos-1 (1/2C).

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