Pulse or digital communications – Synchronizers
Reexamination Certificate
2005-09-20
2005-09-20
Liu, Shuwang (Department: 2634)
Pulse or digital communications
Synchronizers
C375S357000, C375S371000, C375S376000, C331S034000, C327S159000
Reexamination Certificate
active
06947510
ABSTRACT:
A circuit generating an output phase signal with an optionally variable phase shift relative to a reference phase. It includes an oscillator (10) outputting phase signals at n outputs, each of which differs in phase by φ=360°
. These phase signals are applied selectively via multiplexers to a phase interpolator, at the output of which the signal changed in phase relative to a reference phase. The output phase signal is generated in a charging circuit in which a capacitor can be varied by signaling current sources ON/OFF with the aid of phase switches in accordance with the phasing to be produced for the output signal. To avoid jitter in the transition from one phase to another separating switches are inserted in the connection between the current sources and the charging circuit, these separating switches being controlled so that they are never open at the same time.
REFERENCES:
patent: 5245637 (1993-09-01), Gersbach et al.
patent: 6228344 (2001-05-01), Dorshow et al.
patent: 6380774 (2002-04-01), Saeki
patent: 6525615 (2003-02-01), Masenas et al.
patent: RE38482 (2004-03-01), Leung et al.
Dietl Markus
Tambouris Sotirios
Brady III W. James
Liu Shuwang
Moore J. Dennis
Telecky , Jr. Frederick J.
Texas Instruments Deutschland GmbH
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