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. 24, 2003
Filed:
Jun. 23, 2000
Drahoslav Lim, San Diego, CA (US);
GlobespanVirata, Inc., Red Bank, NJ (US);
Abstract
A continuous-time smoothing filter circuit and method for implementing the same are disclosed. The circuit may be implemented as a cascade of two sections. The first section may comprise two programmable 3 order low-pass filters, each filter having a low Q value complex pole pair, as well as, a negative real pole. The second section may comprise an output stage amplifier having a low output impedance in order to drive external loads. Each of the 3 order low-pass filters may be under programmable control to select and coarsely tune the cut-off frequency for each of the two filters. In its broadest terms, the method of the present invention can be described as: processing a digital to analog converter generated output signal with a first 3 order low-pass filter; processing a first output signal provided by the first 3 order low-pass filter with a second 3 order low-pass filter; and processing a second output signal provided by the second 3 order low-pass filter with a low-output impedance amplifier.