Quadrature signal generator for tuning phases of all of four generated quadrature signals
AssigneeSamsung Electronics Co., Ltd.
InventorsEun-chul Park, Chun-deok Suh, Choong-yul Cha
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Abstract
A quadrature signal generator capable of phase-tuning with respect to all of four generated quadrature signals. The quadrature signal generator includes four phase tuning units each having two input terminals, one receiving a differential signal, the other being grounded, and changing a phase of the differential signal to thereby generate quadrature signals. Accordingly, it is possible to tune phases of all the four generated quadrature signals. It is also possible to prevent the amplitude of quadrature signals from being deviated from a reference value.
Claims9
A quadrature signal generator which generates first, second, third, and fourth quadrature signals using first and second differential signals, the quadrature signal generator comprising:
- a first phase tuning unit comprising a first input terminal which receives the first differential signal and a second input terminal, the first phase tuning unit changing a phase of the first differential signal to thereby generate the first quadrature signal;
- a second phase tuning unit comprising a first input terminal which receives the second differential signal and a second input terminal, the second phase tuning unit changing a phase of the second differential signal to thereby generate the second quadrature signal;
- a third phase tuning unit comprising a first input terminal which receives the second differential signal and a second input terminal, the third phase tuning unit changing the phase of the second differential signal to thereby generate the third quadrature signal;
- and
- a fourth phase tuning unit comprising a first input terminal which receives the first differential signal and a second input terminal, the fourth phase tuning unit changing the phase of the first differential signal to thereby generate the fourth quadrature signal,
- wherein the second input terminal of the first phase tuning unit, the second input terminal of the second phase tuning unit, the second input terminal of the third phase tuning unit, and the second input terminal of the fourth phase tuning unit are grounded.
A quadrature signal generator which generates first, second, third and fourth quadrature signals using first and second differential signals, and generates fifth, sixth, seventh and eighth quadrature signals using the first, the second, the third and the fourth quadrature signals, the quadrature signal generator comprising:
- a first phase shift unit comprising a first input terminal which receives the first differential signal and a second input terminal, the first phase shift unit changing a phase of the first differential signal to thereby generate the first quadrature signal;
- a second phase shift unit comprising a first input terminal which receives the second differential signal and a second input terminal, the second phase shift unit changing a phase of the second differential signal to thereby generate the second quadrature signal;
- a third phase shift unit comprising a first input terminal which receives the second differential signal and a second input terminal, the third phase shift unit changing the phase of the second differential signal to thereby generate the third quadrature signal;
- a fourth phase shift unit comprising a first input terminal which receives the first differential signal and a second input terminal, the fourth phase shift unit changing the phase of the first differential signal to thereby generate the fourth quadrature signal;
- a first phase tuning unit having comprising a first input terminal which receives the first quadrature signal and a second input terminal which receives the second quadrature signal, the first phase tuning unit changing phases of the first and the second quadrature signals to thereby generate the fifth quadrature signal;
- a second phase tuning unit comprising a first input terminal which receives the second quadrature signal and a second input terminal which receives the third quadrature signal, the second phase tuning unit changing phases of the second and the third quadrature signals to thereby generate the sixth quadrature signal;
- a third phase tuning unit comprising a first input terminal which receives the third quadrature signal and a second input terminal which receives the fourth quadrature signal, the third phase tuning unit changing phases of the third and the fourth quadrature signals to thereby generate the seventh quadrature signal;
- and
- a fourth phase tuning unit comprising a first input terminal which receives the fourth quadrature signal and a second input terminal which receives the first quadrature signal, the fourth phase tuning unit changing phases of the fourth and the first quadrature signals to thereby generate the eighth quadrature signal,
- wherein the second input terminal of the first phase shift unit, the second input terminal of the second phase shift unit, the second input terminal of the third phase shift unit, and the second input terminal of the fourth phase shift unit are grounded.
Dependencies are inferred from the claim text.