Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Reexamination Certificate
2004-07-06
2009-10-27
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
C326S081000
Reexamination Certificate
active
07609097
ABSTRACT:
A line driver circuit with an output impedance that is set to a value which is based at least in part on the impedance of one or more current sources of the driver circuit. The current source impedance varies depending on the desired output amplitude of the driver circuit. Once the current source impedance is determined, a resistor is selected to be placed in parallel connection with the current source so that the combination of the resistor and the current source impedance will produce a desired output impedance for the driver circuit. Preferably, the driver circuit includes a second current source and second resistor in parallel with each other and a source termination resistor, such that the combination of the current source impedance values and the resistor values produces a desired output impedance for the driver circuit.
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Leonowich Robert H.
Quan Xiaohong
Agere Systems Inc.
Donovan Lincoln
Harman John M.
Hiltunen Thomas J
Santos Daniel J.
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