Modulator and signaling method

Details Modulator and signaling method Modulator and signaling method

2002-06-14

2008-08-05

Phu, Phuong (Department: 2611)

Pulse or digital communications

Transmitters

Angle modulation

C375S279000, C375S280000, C375S281000, C332S144000, C332S146000

Reexamination Certificate

active

07409012

ABSTRACT:
Phase shift key modulators (100, 500, 1000, 1400, 1700) are provided in which a multiphase signal source (108, 1402, 1406-1412,1702) is used to generate a plurality of phases of a carrier signal. A selector (110) is used to select one phase or a sequence of phases of the carrier signal to represent each bit pattern that is received from a binary data source (102, 1422). The multiphase signal source preferably comprises a multiphase oscillator that includes a phase locked ring of variable propagation delay inverters (202). Preferably, a phase sequencer (502) is used to select a monotonic sequence of phases to represent each bit pattern. Preferably two phase selectors (110, 1004) are used to simultaneously select two phases of carrier signal, and a phase interpolator (1106) is used to generate a sequence of phases from the two phases selected by the two phase selectors (110, 1004).

REFERENCES:
patent: 3983485 (1976-09-01), Stuart
patent: 4206423 (1980-06-01), Nossen
patent: 4213094 (1980-07-01), Wood
patent: 5825257 (1998-10-01), Klymyshyn
patent: 6420940 (2002-07-01), Minnis et al.

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