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:
May. 15, 2012
Filed:
Oct. 13, 2009
Hongwei Zhao, Beijing, CN;
Jian Yang, Beijing, CN;
Iven Zheng, Beijing, CN;
Tommy Mao, Beijing, CN;
Waley LI, Beijing, CN;
Hongwei Zhao, Beijing, CN;
Jian Yang, Beijing, CN;
Iven Zheng, Beijing, CN;
Tommy Mao, Beijing, CN;
Waley Li, Beijing, CN;
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
A method for passive cancellation of substrate noise for a buck converter uses an on-chip capacitor to reduce the substrate noise. The capacitor achieves a close-magnitude noise with opposite phase for better noise cancellation effect in the substrate. The capacitor can be realized as a MOS capacitor, NMOS isolation ring n-well capacitor, n-well junction capacitor, isolated p-well junction capacitor, etc. The capacitor is easy to implement. Further, bond wire parasitic inductance in the buck converter is used to reduce substrate noise.