Digitally implemented variable phase shifter and amplitude weighting device
First Claim
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 =φ
c +cos-1 (1/2C) and φ
b =φ
c -cos-1 (1/2C).
2 Assignments
0 Petitions
Accused Products
Abstract
A variable phase shifter and amplitude weighting (VPSAW) device capable of selectively varying the phase and amplitude of an incoming RF signal (RFIN) in such a manner as to produce an output RF signal (RFOUT) having a selected phase and amplitude, by means of splitting the RFIN signal into first and second signal components, selectively shifting the phase of each of these two components, and then combining the thusly selectively phase-shifted first and second signal components. In the presently contemplated best mode of the present invention, the VPSAW device includes digitally-implemented componentry, e.g., microprocessor-controlled direct, digital synthesizers, for generating first and second control signals, e.g., selectively phase-shifted sinusoidal signals, indicative of first and second phase shift increments, φa and φb, respectively, to be imparted to the first and second signal components, respectively. The VPSAW device of the best mode further includes first and second signal mixers for mixing together the first and second control signals with the corresponding first and second signal components, to thereby phase shift the first and second signal components by the first and second phase increments φa and φ.sub. b, respectively. The first and second phase shift increments, φa and φb, satisfy a prescribed algorithm which results in the RFOUT signal having the selected phase (φc) and the selected amplitude (C), e.g., φa =φc +COS-1 (1/2 C) and φb =φc -COS-1 (1/2 C). Additionally, the first and second mixers may serve to downconvert the RFIN signal by subtracting the frequency of the first and second control signals from the frequency of the first and second signal components.
-
Citations
15 Claims
-
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 =φ
c +cos-1 (1/2C) and φ
b =φ
c -cos-1 (1/2C). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A variable phase shifter and amplitude weighting device for selectively varying the phase and amplitude of an input RF signal in order to produce an RF output signal having a selected phase, φ
-
c, and amplitude, C, the device including;
means for dividing said input RF signal into separate first and second RF signal components; means for generating a first control signal indicative of a first phase shift increment φ
a, and a second control signal indicative of a second phase shift increment φ
b ;means responsive to said first and second control signals for phase shifting said first RF signal component by said first phase shift increment φ
a, and for phase shifting said second RF signal component by said second phase shift increment φ
b, to thereby produce first and second phase-shifted RF signal components, respectively, said phase shifting means comprising;first digital synthesizer means for generating a first sinusoidal output signal; second digital synthesizer means for generating a second sinusoidal output signal; first mixer means for mixing together said first RF signal component and said first sinusoidal signal, to thereby phase shift said first RF signal component by said first phase shift increment, φ
a ; and
and,second mixer means for mixing together said second RF signal component and said second sinusoidal signal, to thereby phase shift said second RF signal component by said second phase shift increment, φ
b ;means for combining said first and second phase-shifted RF signal components, to thereby produce said output RF signal; and
,wherein said first and second phase shift increments, and respectively, satisfy a prescribed algorithm which results in said output RF signal having said selected phase, φ
c, and amplitude, C. - View Dependent Claims (14, 15)
-
c, and amplitude, C, the device including;
Specification