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. 17, 2003
Filed:
May. 12, 1999
Lordson L. Yue, Foster City, CA (US);
Parin B. Dalal, Milpitas, CA (US);
Avery Wang, Redwood City, CA (US);
ATI International SrL, Christchurch, BB;
Abstract
An approximation circuit approximates a function f(x) of an input value “x” by adding at least the first two terms in a Taylor series (i.e., f(a) and f′(a)(x−a)) where “a” is a number reasonably close to value “x”. The first term is generated by a first look-up table which receives the approximation value “a”. The first look-up table generates a function f(a) of the approximation value “a”. The second look-up table generates a first derivative f′(a) of the function f(a). A first multiplier then multiplies the first derivative f′(a) by a difference (x−a) between input value “x” and approximation value “a” to generate a product f′(a)(x−a). The approximation circuit can approximate the function f(x) by adding the third term of the Taylor series, (½)f″(a)(x−a) .