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:
Aug. 13, 2002
Filed:
Jan. 11, 2001
Teruo Sasaki, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In a frequency-voltage conversion circuit, integrating means gives a predetermined slope for rising or falling of a rectangular pulse signal. First comparing means compares an output value of the integrating means with a threshold value, and produces a pulse signal line having a pulse width corresponding to frequency of the rectangular pulse signal. Storing means stores and retains the threshold value. Smoothing means smooths the pulse signal line, and produces a voltage value corresponding to the frequency of the rectangular pulse signal. Second comparing means compares the voltage value with a reference voltage, and charges and discharges electric charge for the storing means on the basis of the comparison result.