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:
Jan. 09, 2007
Filed:
Feb. 22, 2005
Yoshiaki Konno, Isehara, JP;
Yoshiaki Konno, Isehara, JP;
Asahi Kasei Microsystems Co., Ltd., Tokyo, JP;
Abstract
The output amplitude of a variable gain amplifier is compared with a reference value by a differential amplifier. When the amplitude is less than the reference value, the gain of the variable gain amplifier is increased to augment the output amplitude. When the amplitude is greater than the reference value, the gain of the variable gain amplifier is decreased to reduce the output amplitude. Only part of the variable gain range of the variable gain amplifier is corresponded to the potential at VLP by installing an input switching unit for inverting the output polarity of the differential amplifier, an input switching unit for inverting the output polarity of a differential amplifier, comparator, an IDAC, and a logic circuit for controlling the ON and OFF of switches of the input switching units and the output current value of the IDAC.