Modulators – Phase shift keying modulator or quadrature amplitude modulator
Patent
1998-03-18
2000-01-11
Grimm, Siegfried H.
Modulators
Phase shift keying modulator or quadrature amplitude modulator
375280, 375296, 375308, H04L 2720
Patent
active
060140658
ABSTRACT:
A multi-phase modulator for modulating n digital data into a 2.sup.n digital phase modulated signal includes digital-analog convertors for converting the digital data into analog signals, automatic gain compensators for controlling output levels of the analog signals, binary phase modulators for modulating the analog signals, a 90-degree phase shifter operatively connected to the binary phase modulators for providing modulated signals, the modulated signals being phase shifted from one another by 90-degrees, and offset compensators for compensating and adjusting offsets of orthogonal adjustment by automatic control, the offset compensators including DC offset compensators for controlling DC voltages of the digital-analog convertors, gain offset compensators for controlling gains of the automatic gain compensators, and a phase offset compensator for controlling phases of the modulated signals provided by the 90-degree phase shifter and input to the binary phase modulators.
REFERENCES:
patent: 5355101 (1994-10-01), Ichihara et al.
patent: 5371481 (1994-12-01), Tittanen et al.
patent: 5663691 (1997-09-01), Kowalik et al.
Grimm Siegfried H.
NEC Corporation
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