Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Reexamination Certificate
2006-12-26
2009-06-23
Tran, Pablo N (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Frequency or phase modulation
C455S114300, C455S341000, C326S082000, C330S292000, C375S296000
Reexamination Certificate
active
07551897
ABSTRACT:
A pre-emphasis circuit and methods are provided. The circuit includes a first amplifier and a second amplifier. The first amplifier contains M first driver cells and is operable to amplify a signal. The second amplifier contains P second driver cells and is operable to amplify a delayed version of the signal The pre-emphasis circuit further includes logic circuit operable to change a pre-emphasis ratio of the pre-emphasis circuit including switching off one or more of the M first driver cells of the first amplifier and switching on a corresponding one or more of the P second driver cells of the second amplifier, such that a swing amplitude for an output signal provided by the pre-emphasis circuit is maintained at a constant level.
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Marvell International Ltd.
Tran Pablo N
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