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:
Jan. 01, 2013
Filed:
Jan. 20, 2011
Mihai Sanduleanu, Yorktown Heights, NY (US);
Ping-yu Chen, Hsinchu, TW;
Mihai Sanduleanu, Yorktown Heights, NY (US);
Ping-Yu Chen, Hsinchu, TW;
International Business Machines Corporation, Armonk, NY (US);
Abstract
An exemplary filter includes N (≧2) unity gain amplifiers, each with a pair of differential input terminals and a pair of differential output terminals; a pair of filter differential input terminals; a first pair of variable resistances coupling the pair of filter differential input terminals to the pair of differential input terminals of the first unity gain amplifier; N−1 pairs of variable resistances coupling the pairs of differential output terminals of each of the N unity gain amplifiers, other than the last one, to the pairs of differential input terminals of its downstream neighbor; N−1 pairs of variable capacitances coupling the pairs of differential input terminals of each of the N unity gain amplifiers, other than the last one, to the pairs of differential output terminals of its downstream neighbor; and a variable capacitance coupling the pair of differential input terminals of the last unity gain amplifier to each other.