Turn-on bus transmitter with controlled slew rate

Details Turn-on bus transmitter with controlled slew rate Turn-on bus transmitter with controlled slew rate

2007-07-17

2007-07-17

Le, Dinh T (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Slope control of leading or trailing edge of rectangular or...

C327S108000, C326S083000

Reexamination Certificate

active

10535556

ABSTRACT:
An amplifier/driver (40) for a bus has an output transistor (M1) that is controlled by a controlled current source (I1). In a quiescent state, the output transistor is configured as part of a current mirror (M1, M11) that maintains a gate-source voltage on the output transistor above the threshold voltage of the output transistor, thereby providing a fast turnon turn-on time. In an active state, the controlled current source provides a substantially constant current to the output transistor to achieve a controlled slew-rate, then reduces the current to the output transistor when a desired output voltage level is achieved. To improve power efficiency, a second controlled current source (I2) provides current to the output load when the desired output voltage level is achieved. To minimize transients, a class-AB control circuit (710) provides a minimum bias current to the output transistor, to prevent it from turning off when the desired output voltage level is achieved.

REFERENCES:
patent: 4320521 (1982-03-01), Balakrishnan et al.
patent: 4593206 (1986-06-01), Neidorff et al.
patent: 4825099 (1989-04-01), Barton
patent: 5070256 (1991-12-01), Grondalski
patent: 5583465 (1996-12-01), Fonderie et al.
patent: 6100742 (2000-08-01), Erckert
patent: 6281730 (2001-08-01), Vu
patent: 0 575 676 (1993-12-01), None

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