Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Reexamination Certificate
2006-12-26
2006-12-26
Tran, Pablo N. (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Frequency or phase modulation
C455S114300, C455S341000, C326S082000
Reexamination Certificate
active
07155164
ABSTRACT:
A pre-emphasis circuit and methods are provided. The circuit includes a first amplifier and a second amplifier. The first amplifier is operable to amplify a signal using a first amplifier current, and the second amplifier is operable to amplify a delayed version of the signal using a second amplifier current. The pre-emphasis circuit further includes a logic circuit operable to change a pre-emphasis ratio of the pre-emphasis circuit including switching off one or more of first driver cells of the first amplifier and switching on a corresponding one or more of second driver cells of the second amplifier, such that a total current consumption of the first amplifier and the second amplifier remains substantially constant.
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Marvell International Ltd.
Tran Pablo N.
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