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:
Dec. 13, 2011
Filed:
Mar. 30, 2009
Thart Fah Voo, Singapore, SG;
Thart Fah Voo, Singapore, SG;
Marvell International, Ltd., Hamilton, BM;
Abstract
A high pass filter has a cutoff frequency. The high pass filter includes a first amplifier to receive an input signal. The high pass filter attenuates low frequency signals of the input signal that are below the cutoff frequency. A second amplifier provides an output signal. The output signal comprising only high frequency signals of the input signal that are above the cutoff frequency. A capacitive element is coupled in between the first amplifier and the second amplifier. A variable frequency module controls a plurality of resistive paths of the high pass filter. Each resistive path corresponds to a different cutoff frequency for the high pass filter. The variable frequency module is configured to prevent any leakage current from draining the capacitive element.