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:
Apr. 15, 2003
Filed:
Aug. 21, 2001
Applicant:
Inventor:
Brian Martin, Carlsbad, CA (US);
Assignee:
National Semiconductor Corporation, Santa Clara, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 5/00 ;
U.S. Cl.
CPC ...
H03K 5/00 ;
Abstract
An apparatus is disclosed for implementing a complex filter of the type represented by a transfer function having a complex pole. The apparatus is capable of creating real and imaginary parts, Y and Y , of a complex output signal in response to receiving real and imaginary parts, X and X , of a complex input signal. The apparatus comprises a plurality of variable resistors that may be tuned to adjust various operating parameters of the complex filter.