Voltage mode current-assisted pre-emphasis driver

Details Voltage mode current-assisted pre-emphasis driver Voltage mode current-assisted pre-emphasis driver

2006-09-19

2006-09-19

Chang, Daniel (Department: 2819)

Electronic digital logic circuitry

Function of and, or, nand, nor, or not

Field-effect transistor

C326S083000, C327S108000

Reexamination Certificate

active

07109759

ABSTRACT:
Driver circuit that generates a drive waveform with a static bit swing and a pre-emphasis bit swing. The driver circuit includes an input (IN) node, a complementary input (INB) node, an output (OUT) node and a complementary output (OUTB) node. The driver circuit includes a fundamental swing determination mechanism (FSDM) that is coupled to the output (OUT) node and a complementary output (OUTB) node. The fundamental swing determination mechanism (FSDM) determines or sets the fundamental swing of the drive waveform by generating a fundamental current. The fundamental swing determination mechanism (FSDM) includes at least one switched resistor circuit. The driver circuit also includes a modulation swing determination mechanism (MSDM) that is coupled to the output (OUT) node and a complementary output (OUTB) node. The modulation swing determination mechanism (MSDM) determines or sets the modulation swing of the drive waveform by generating a modulation current. The modulation swing determination mechanism (MSDM) includes at least one switched current source. The pre-emphasis bit swing of the drive waveform is generated when the modulation current is added to the fundamental current. The static bit swing is generated when the modulation current is subtracted from the fundamental current.

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