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:
Nov. 27, 2012
Filed:
Mar. 04, 2009
Shoji Kojima, Tokyo, JP;
Shoji Kojima, Tokyo, JP;
Advantest Corporation, Tokyo, JP;
Abstract
An equalizer circuit receives digital amplitude data A[N] which represents the amplitude level of the N-th (N is a nonnegative integer) signal to be transmitted via a transmission line and timing data T[N] which represents the cycle of the signal, and performs waveform shaping. The equalizer circuit includes: M (M is an integer) calculation units ECUthrough ECU; and an adder ADDwhich adds the output data of the M calculation units ECUthrough ECUand the amplitude data A[N] together so as to generate equalized amplitude data D[N]. A step response waveform R(t) for the transmission line is approximated by Expression R(t)=S(t)·(1−Sf(t)) using M (M is an integer of 2 or more) functions f(t) (1≦j≦M) and a step waveform S(t) with the time t as an argument. The representative value of the function f(t) in a range between Tand Tis represented by a function g(T, T). The calculation unit ECUcalculates output data D[N] represented by Expression D[N]=Σ[(A[n]−A[n−1])·g(t−t, t−t).