Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Reexamination Certificate
2000-01-26
2001-07-24
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
C327S387000, C327S391000, C327S427000, C326S027000, C326S087000
Reexamination Certificate
active
06265915
ABSTRACT:
FIELD OF THE INVENTION
This invention generally relates to electronic systems and in particular it relates to output control circuits.
BACKGROUND OF THE INVENTION
In almost all CMOS output circuits output ringing due to large amounts of current into ground is a common problem. This phenomenon is most evident during conditions where all or many outputs are switched at once. There have been many types of edge control circuitry introduced in order to deal with this problem. However the trade off for edge control is usually a loss in speed.
SUMMARY OF THE INVENTION
The output edge control circuit includes: a high side transistor coupled to an output node; a first low side transistor coupled to the output node; a second low side transistor coupled in parallel with the first low side transistor; a coupling transistor coupled between the output node and a control node of the second low side transistor; a transmission gate coupled between a control node of the first low side transistor and a control node of the coupling transistor; and feedback circuitry coupled between the output node and the transmission gate for controlling the transmission gate.
REFERENCES:
patent: 5841702 (1998-11-01), Kim
patent: 6137322 (2000-10-01), Ten Eych
Rider Nathan T.
Spurlin James C.
Brady III Wade James
Callahan Timothy P.
Nguyen Minh
Stewart Alan K.
Telecky , Jr. Frederick J.
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