| 摘要 |
<p>A 2<N>-phase phase modulator, N being a positive integer, provides a 2<N>-phase modulated signal by phase-modulating a carrier wave (c) with N sets of digital data (a, b). The modulator comprises N sets of 2-phase phase modulating means (121, 123) arranged serially to each other and having two input terminals, respectively, and (N-1) sets of 1/2 frequency-dividing means (122) connected between each of said N sets of 2-phase phase modulating means (121, 123) for frequency-dividing by one half the input signals (i) thereto. The 2<N>-phase phase modulated signal (k) is provided at the output of the final stage of said N sets of 2-phase phase modulating means (121, 123). The modulator is suited for fabrication in the form of an integrated circuit and has precise waveform characteristics with low deterioration of the modulator output. </p> |
