Output slew rate control in low voltage differential signal...

Details Output slew rate control in low voltage differential signal... Output slew rate control in low voltage differential signal...

2007-11-30

2010-11-30

Nguyen, Long (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S112000, C327S179000, C326S083000

Reexamination Certificate

active

07843235

ABSTRACT:
A differential signal driver includes a pre-driver configured to generate a constant charging current and a constant discharging current. A first capacitor of the pre-driver is charged with the charging current when a differential input signal has a first state, and discharged with the discharging current when the differential input signal has a second state, thereby developing a first output control voltage on the first capacitor. A second capacitor of the pre-driver is discharged with the discharging charging current when the differential input signal has the first state, and charged with the charging current when the differential input signal has the second state, thereby developing a second output control voltage on the second capacitor. An output driver circuit generates a differential output signal in response to the first and second output control voltages. The slew rate of the differential output signal is controlled by the charging and discharging currents.

REFERENCES:
patent: 6975141 (2005-12-01), Mueller et al.
patent: 7183804 (2007-02-01), Icking et al.
patent: 2003/0025541 (2003-02-01), Humphrey et al.
patent: 2007/0222486 (2007-09-01), Koch, II et al.

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