Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Reexamination Certificate
2011-06-14
2011-06-14
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
C327S237000, C327S238000, C327S256000
Reexamination Certificate
active
07961025
ABSTRACT:
In one illustrative embodiment, an apparatus for a current-mode phase rotator with partial input phase switching comprises a mixer, wherein the mixer is a four quadrant current-mode mixer comprised of four interpolation buffers, wherein each interpolation buffer receives as input a clock phase from a set of four equidistant clock phases, and a set of two-output current-steering digital to analog converters that supply tail currents to the mixer wherein a first digital to analog converter has additional switches to connect each of two outputs to one of two polarities of a given clock while each remaining digital to analog converter has no additional switches and has two outputs supplying current only to two different polarities of a same clock phase wherein steering the current during incremental rotation about a phase circle defines an octagonal shaped phase envelope.
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Donovan Lincoln
Gerhardt Diana R.
International Business Machines - Corporation
Poos John W
Yee & Associates P.C.
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