Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2006-11-08
2010-06-08
Lugo, David B (Department: 2611)
Pulse or digital communications
Receivers
Angle modulation
C375S308000
Reexamination Certificate
active
07733984
ABSTRACT:
A method for implementing phase rotator circuits and phase rotator circuit of the invention includes a polyphase filter network to create a quadrature phase version of the input signal. The polyphase filter network is partitioned into a first part that is physically isolated from the phase rotator circuit and a second part that is embedded in the phase rotator circuit. The second part of the polyphase filter is coupled to the first part of the polyphase filter by a high-pass equalizing buffer stage. The second part of the polyphase filter is coupled to the phase rotator circuit by a bandlimiting buffer stage.
REFERENCES:
patent: 4723318 (1988-02-01), Marshall
patent: 6380783 (2002-04-01), Chao et al.
patent: 7164901 (2007-01-01), Zheng et al.
patent: 2007/0081610 (2007-04-01), Krivokapic et al.
Baumgartner Steven John
Bonaccio Anthony Richard
Bulzacchelli John Francis
Dreps Daniel Mark
International Business Machines - Corporation
Lugo David B
Pennington Joan
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