The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 26, 2002
Filed:
Mar. 22, 2001
Anthony Yap Wong, Cupertino, CA (US);
Pericom Semiconductor Corp., San Jose, CA (US);
Abstract
An active terminating circuit has n-channel and p-channel sensing transistors with gates connected to a transmission line. The sensing transistors drive a back node connected to a pair of capacitors. One capacitor drives a p-gate node coupled to a gate of a p-channel clamping transistor, while the other capacitor drives an n-gate node coupled to a gate of an n-channel clamping transistor. The drains of the clamping transistors are connected to the transmission line. Resistors pull the p-gate node to the power-supply voltage and pull the n-gate node to ground when no transitions occur on the transmission line to achieve zero standby power. When a transition is detected, it is inverted and coupled through the capacitors to the p-gate and n-gate nodes. The p-channel clamping transistor is turned on for rising transitions, while the n-channel clamping transistor is turned on for falling transitions. Limiting transistors limit gate-node swings.