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US 2012/0294388 A1Published application
Vector modulator
AssigneeLS Industrial Systems Co., Ltd.
InventorsHeon soo Choi, Chang su Choi, Hyung jun Jeon, Yeong chan Kim, Jae hwan Im, Jung ki Ruy
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Abstract
Disclosed is a vector modulator. The vector modulator can control the amplitude and phase of an input signal, by not using amplitude variable attenuators but using phase shifters. Further, the vector modulator has a simple configuration and enables an input signal to be exactly modulated. Furthermore, the vector modulator can modulate the phase of an input signal throughout all areas in the polar coordinate system.
Claims5
A vector modulator, comprising:
- first and second phase shifters configured to respectively shift the phases of in-phase (I) and quadrature (Q) channel signals constituting an input signal within a predetermined phase range;
- a first coupler configured to convert the I channel signal output from the first phase shifter into first and second channel signals having a phase difference of 90 degrees with each other;
- a second coupler configured to convert the Q channel signal output from the second phase shifter into third and fourth channel signals having a phase difference of 90 degrees with each other;
- third and fourth phase shifters configured to respectively shift the phases of the first and second channel signals output from the first coupler within a predetermined phase range;
- fifth and sixth phase shifters configured to respectively shift the phases of the third and fourth channel signals output from the second coupler within a predetermined phase range;
- a first combiner configured to combine the first and second channel signals having the shifted phases, output from the respective third and fourth phase shifters;
- a second combiner configured to combine the third and fourth channel signals having the shifted phases, output from the respective fifth and sixth phase shifters;
- and
- a third combiner configured to combine output signals respectively output from the first and second couplers.
6 more elements
Dependencies are inferred from the claim text.