Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Patent
1997-02-21
1998-10-20
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
327384, 326 24, 326 83, 326 87, H03K 512, H03K 1704
Patent
active
058252193
ABSTRACT:
A method for asserting signals onto an output line connected to a passive external pull-up resistor by using a fast edge rate signal driver is provided. The fast edge rate signal driver has first, second and third pull-down predrivers, first, second and third pull-up predrivers, first and second delay elements, and first, second and third output devices, and a PMOS and an NMOS current controller, and each of the output devices has one output terminal coupled to each other forming the output line. The method includes the steps of: (1) applying an input signal to the control terminal of a PMOS current controller for turning ON the PMOS current controller, and to the first pull-down predriver such that a first trigger signal output from the first pull-down predriver applies to the first output device; (2) passing the input signal through the first delay element to generate a first delayed signal which applies to the second pull-down predriver, whereby a second trigger signal output from the second pull-down predriver applies to the second output device; (3) passing the first delayed signal through the second delay element to generate a second delayed signal which applies to the third pull-down predriver, whereby a third trigger signal output from the third pull-down predriver applies to the third output device.
REFERENCES:
patent: 4785203 (1988-11-01), Nakamura
patent: 5109166 (1992-04-01), Coburn et al.
patent: 5287527 (1994-02-01), Delp et al.
patent: 5483188 (1996-01-01), Frodsham
Callahan Timothy P.
Lam T. T.
Silicon Integrated SyStem Corp.
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