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. 01, 2008
Filed:
Nov. 21, 2006
Kazuyuki Hori, Tokyo, JP;
Yuji Ishida, Fujisawa, JP;
Toshiaki Kurokawa, Fujisawa, JP;
Keiichi Hirota, Yokohama, JP;
Shouhei Murakami, Yokohama, JP;
Kazuyuki Hori, Tokyo, JP;
Yuji Ishida, Fujisawa, JP;
Toshiaki Kurokawa, Fujisawa, JP;
Keiichi Hirota, Yokohama, JP;
Shouhei Murakami, Yokohama, JP;
Hitachi Communication Technologies, Ltd., Tokyo, JP;
Abstract
In a time-interleaved AD converter which combines together low-speed high-resolution AD converters for effective high speed operation, various deterioration factors possessed by each of the converters, including DC offset, conversion gain error, sampling timing error, and a frequency characteristic, need to be compensated. The compensation is performed through nonlinear filter operation in which a constant term is added to linear filter operation. A high-speed low-resolution AD converter is separately used, and through adaptive signal processing in which an output signal thereof is defined as an instruction signal, a compensation coefficient is calculated. In this condition, the compensation can be performed without the influence of quantization noise attributable to the high-speed low-resolution AD converter.