Patent ID: 7518459

Claim:
A harmonic-rejection modulation device for modulating a baseband signal, comprising: a phase splitter, generating a plurality of unfiltered local oscillating signals based on an input signal, wherein the unfiltered local oscillating signals have phase angles of 0°, 30°, 90°,120°, 180°, 210°, 270°, and 300°, respectively; a low pass filter, filtering the high frequency signals from the unfiltered local oscillating signals, and generating a plurality of local oscillating signals having phase angles of 0°, 30°, 90°, 120°, 180°, 210°, 270°, and 300°, respectively; and a modulator, modulating an in-phase signal of the baseband signal by the local oscillating signal having 210° phase angle to generate a first signal, modulating the in-phase signal by the local oscillating signal having 270° phase angle to generate a second signal, modulating a quadrature phase signal by the local oscillating signal having 300° phase angle to generate a third signal, modulating the quadrature phase signal by the local signal having 0° phase angle to generate a fourth signal, modulating the in-phase signal by the local signal having 30° phase angle to generate a fifth signal, modulating the in-phase signal by the local oscillating signal having 90° phase angle to generate a sixth signal, modulating the quadrature phase signal by the local oscillating signal having 120° phase signal to generate a seventh signal, modulating the quadrature phase signal by the local oscillating signal having 180° phase angle to generate an eighth signal, summing up the first, second, third and fourth signals to generate a first modulation signal, and summing up the fifth, sixth, seventh and eighth signals to generate a second modulation signal.