Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating
Reexamination Certificate
2007-05-08
2007-05-08
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
C327S172000, C327S108000
Reexamination Certificate
active
11068116
ABSTRACT:
Integrated circuit, system, method and machine readable media embodiments adjust a slew rate and/or a transmit pre-emphasis of an output signal at selected phases during a bit time. A timing circuit provides a plurality of delayed data signals in response to a clock signal. A plurality of adjustable impedance circuits, including a plurality of select circuits, output a plurality of selected delayed data signals to form the output signal having an adjusted slew rate. Delay elements in the timing circuit are also biased from a current of a lock loop circuit to further adjust slew rate of the output signal. Transmit pre-emphasis of the output signal is adjusted by selecting a polarity of a selected delayed data signal in each of the plurality of adjustable impedance circuits. Each adjustable impedance circuit also includes a predriver and driver for adjusting impedance in response to a signal indicating an impedance value. In an embodiment, an integrated circuit is able to operate in multiple modes of operation depending upon the type of output signal, frequency range of the output signal, physical packaging and/or system configuration.
REFERENCES:
patent: 5739707 (1998-04-01), Barraclough
patent: 6452428 (2002-09-01), Mooney et al.
patent: 6704818 (2004-03-01), Martin et al.
Le Dinh T.
Rambus Inc.
Vierra Magen Marcus & DeNiro LLP
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