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US 8,588,337 B2Granted
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:
- a first phase shifter configured to shift a phase of an in-phase (I) channel signal of an input signal within a first predetermined phase range;
- a second phase shifter configured to shift a phase of a quadrature (Q) channel signal of an input signal within a second predetermined phase range;
- a first coupler configured to convert the phase-shifted I channel signal into first and second channel signals having a 90 degree phase difference;
- a second coupler configured to convert the phase-shifted Q channel signal into third and fourth channel signals having a 90 degree phase difference;
- a third phase shifter configured to shift the phase of the first channel signal within a third predetermined phase range;
- a fourth phase shifter configured to shift the phase of the second channel signal within a fourth predetermined phase range;
- a fifth phase shifter configured to shift the phase of the third channel signal within a fifth predetermined phase range;
- a sixth phase shifter configured to shift the phase of the fourth channel signal within a sixth predetermined phase range;
- a first combiner configured to combine the phase-shifted first channel signal and the phase-shifted second channel signal into a combined I channel signal (If);
- a second combiner configured to combine the phase-shifted third channel signal and the phase-shifted fourth channel signal into a combined Q channel signal (Qf);
- and
- a third combiner configured to combine signals output from the first and second couplers,
- wherein a phase-shift area of the combined channel signal If is within a range of 0 to 270 degrees, and
- wherein a phase-shift area of the combined channel signal Qf is within a range of 90 to 360 degrees.
11 more elements
Dependencies are inferred from the claim text.