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:
Jun. 29, 2004
Filed:
Jun. 12, 2003
Christian Klein, Portland, ME (US);
James J. McDonald, II, Gorham, ME (US);
Fairchild Semiconductor Corporation, South Portland, ME (US);
Abstract
A buffer circuit with slow output edges is described. Pulsed higher value currents are driven from one shot timing circuits to inject a pulse of current into the control gate of the buffer's output MOSFET to speed up the beginning of the turning on or the turning off of the output MOSFT. When the beginning and turning on and off is reached lower value current sources continue to drive the gate of the output MOSFET. In one embodiment, one shots are triggered from the rising and falling edges of the input signal. The effect of the higher value current pulses is to reduce the circuit delay through the buffer. Also, the pulse width can be designed as temperature sensitive, and supply voltage sensitive so as to maintain the buffer circuit delay as substantially constant as temperature, supply voltage and process variation occur.