Phase modulator

Details Phase modulator Phase modulator

2005-05-10

2005-05-10

Kinkead, Arnold (Department: 2817)

Modulators

Phase modulator

C332S103000, C375S279000, C375S308000

Reexamination Certificate

active

06891445

ABSTRACT:
In response to changes in an input binary digital signal, a 3rd order cosine pulse waveform, which, when it is changed in the increasing direction, has “0” level in a first period of T/12 (T corresponding to one-half cycle of the binary digital signal), is changed as a waveform of (h/2)(1+cos(3πt/T)+π/4) in the next period of 4T/12 (−5T/12≦t≦−T/12) and has an h (constant) level in the remaining period of T/12, and when it is changed in the reducing direction, has the h level in the first period of T/12, is changed as a waveform of (h/2)(1+cos(3πt/T)−π/4) in the next period of 4T/12 (T/12≦t≦5T/12) and also has “0” level in the remaining period of T/12. By using this pulse wave, a flat part is generated in a time width of T/12 with respect to a judgment point. It is thus possible to improve the immunity to the effects of digital signal jitter, obtain change judgment with a sole single pulse and reduce the circuit scale and the power consumption.

REFERENCES:
patent: 4584541 (1986-04-01), Nossen
patent: 4680556 (1987-07-01), Nakamura et al.
patent: 5121412 (1992-06-01), Borth
J.H. Gray, “Graychip Application Notes: Building a QAM Modulator Using a GC2011 Digital Filter Chip,” Graychip, Inc. (Oct. 6, 1984), pp. 1-4.
W.R. Bennett et al., “Data Transmission,” Inter-University Electronics Series, vol. 2, McGraw-Hill Company, pp. 50-53.

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