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:
Jul. 23, 1996
Filed:
Apr. 18, 1994
Takeshi Nagahori, Tokyo, JP;
NEC Corporation, , JP;
Abstract
An automatic offset control circuit comprises a differential output preamplifier having an offset adjustment function, further comprising an average detector, a peak detector, and a differential input amplifier. The average detector generates a reference voltage representing an average value of a positive output and a negative output of the preamplifier. The peak detector outputs a peak voltage representing a peak of the negative output of the preamplifier. The differential input amplifier compares the peak voltage with the reference voltage to output an offset adjustment signal to the preamplifier. The offset adjustment signal is obtained based on a difference between the reference voltage and the peak voltage. A bottom detector may be used instead of the peak detector, provided a bottom value is detected using the positive output of the preamplifier.