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:
Aug. 12, 2008
Filed:
Oct. 23, 2007
Nathan Robert Green, Beaverton, OR (US);
Loren L. Mclaury, Hillsboro, OR (US);
Nathan Robert Green, Beaverton, OR (US);
Loren L. McLaury, Hillsboro, OR (US);
Lattice Semiconductor Corporation, Hillsboro, OR (US);
Abstract
Circuits and related methods are provided for buffering reference voltages from noise associated with output driver transistors. In one example, an output driver buffer circuit includes an output driver transistor adapted to adjust an output voltage of an output pad. The circuit also includes a pre-driver circuit connected to a gate of the output driver transistor. The pre-driver circuit is adapted to receive a reference voltage to control the output driver transistor. The pre-driver circuit includes a precharged capacitor, a first switch adapted to connect the capacitor to the gate, and a second switch adapted to connect the reference voltage to the gate. The second switch is adapted to operate following a time period after the capacitor is connected to the gate. The capacitor is adapted to buffer noise associated with the output driver transistor during the time period.