Programmable amplitude line driver
AssigneeAgere Systems Inc.
InventorsMehran Aliahmad, Russ Brown, Ivan Chan, Kristopher Kshonze
Life of this patent
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Abstract
Embodiments of the invention include an integrated circuit including a line driver. The integrated circuit includes a voltage mode driver comprising complementary first and second input voltage drivers, a programmable resistor network and a current mode driver. The programmable resistor network allows the amplitude of the line driver outputs to be controlled based on the particular resistor connections in the programmable resistor network. Also, the differential impedance of the integrated circuit and the common mode impedance of the integrated circuit are based on the resistance values of the resistors in the programmable resistor network.
Claims14
An integrated circuit including a line driver circuit, comprising:
- a first input voltage driver having an output;
- a second input voltage driver having an output and coupled to and complementary with the first input voltage driver;
- a programmable resistor network coupled between the output of the first input voltage driver, the output of the second input voltage driver, a first output, and a second output;
- and
- a current mode arrangement coupled between the first input voltage driver, the second input voltage driver, and the programmable resistor network,
- wherein the differential impedance of the integrated circuit is based on the resistance of the programmable resistor network,
- wherein the common mode impedance of the integrated circuit is based on the resistance of the programmable resistor network, and
- wherein the programmable resistor network controls the output amplitude of the integrated circuit at the first output and at the second output.
Dependencies are inferred from the claim text.