Patent Number: 6,529,043

Title: LVDS current steering input buffer

Abstract: The present invention provides a method and apparatus for current steering for an LVDS input buffer. A current steering circuit is configured to steer current to a first node and/or a second node in response to a comparison between the input common-mode signal and a reference signal. During high input common-mode, more current is steered to the P-channel differential pair node of the input buffer as compared to the N-channel differential pair node. During low input common-mode, more current is steered to the N-channel differential pair node of the input buffer as compared to the P-channel differential pair node. The current steering reduces jitter and achieves stable output of the input buffer over process, voltage and temperature. The method and apparatus provided ensures a stabilized summation of the currents I.sub.D1 +I.sub.D3 and I.sub.D2 +I.sub.D4 by steering current into the P-channel node or N-channel node.

Inventors: Hannan; Douglas M. (Gray, ME)

Assignee: National Semiconductor Corporation

International Classification: H03F 3/45 (20060101); H03K 019/094 (); H03F 003/45 ()

Expiration Date: 03/04/2020