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. 20, 2007
Filed:
May. 15, 2002
Applicants:
Yoshihide Komatsu, Osaka, JP;
Takefumi Yoshikawa, Osaka, JP;
Inventors:
Yoshihide Komatsu, Osaka, JP;
Takefumi Yoshikawa, Osaka, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R 23/14 (2006.01);
U.S. Cl.
CPC ...
Abstract
A circuit for detecting whether an intermittent clock waveform signal of 50 MHz is received or not includes an offset receiver, a charge pump, a capacitor and a hysteresis comparator. A circuit for detecting whether a random data waveform signal of 500 MHz is received or not includes an offset-less receiver, a transition counter, a delay circuit and an AND circuit. An OR circuit outputs as a signal detection signal a signal indicating the OR operation result of respective outputs of the hysteresis comparator and the AND circuit.