Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Bus or line termination
Reexamination Certificate
2005-09-27
2005-09-27
Tran, Anh Q. (Department: 2819)
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Bus or line termination
C326S032000, C326S033000, C326S034000
Reexamination Certificate
active
06949949
ABSTRACT:
An output impedance bias compensation system for adjusting output impedance of at least one output including a reference impedance generator, an impedance matching controller, at least one output impedance generator, and a programmable bias controller. The reference impedance generator develops a reference impedance based on a reference value. The impedance matching controller continually adjusts an input of the reference impedance generator to match the reference value within a predetermined tolerance. Each output impedance generator is coupled to a corresponding output and is controlled by an output impedance control input. The programmable bias controller combines a bias amount with the value of the input of the reference impedance generator to provide the output impedance control input. The bias controller is programmable to provide a bias amount to compensate for any process variations between the reference impedance generator and each output impedance generator.
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Huffman James W.
Huffman Richard K.
IP-First LLC
Stanford Gary R.
Tran Anh Q.
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