Output swing clamp for USB differential buffer

Details Output swing clamp for USB differential buffer Output swing clamp for USB differential buffer

1996-06-28

1998-09-15

Hudspeth, David R.

Electronic digital logic circuitry

Interface

Current driving

326 30, H03K 190185

Patent

active

058084819

ABSTRACT:
The claimed invention is a driver circuit for transmitting data via an output node thereof to a transmission line. The driver circuit includes a first driving device coupled to the output node and a second driving device also coupled to the output node. The driver circuit also includes a clamping device coupled to the output node. The clamping device clamps the output node at a first predetermined voltage level. A termination device is coupled to the output node of the driver circuit. The termination device includes a triggering device and a termination path. The triggering device is coupled to the termination path such that the triggering device causes a current flow via the termination path when a voltage at the output node exceeds a second predetermined voltage level. The second predetermined voltage level is higher than the first predetermined voltage level.

REFERENCES:
patent: 4608636 (1986-08-01), Beals
patent: 5184033 (1993-02-01), Chiao et al.
patent: 5287022 (1994-02-01), Wilsher
patent: 5436588 (1995-07-01), Ghaffaripour
patent: 5479124 (1995-12-01), Pun et al.
patent: 5497106 (1996-03-01), Raatz et al.

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