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:
Jun. 26, 2012
Filed:
Mar. 23, 2011
Toshiyuki Tsuzaki, Chiba, JP;
Toshiyuki Tsuzaki, Chiba, JP;
Seiko Instruments Inc., Chiba, JP;
Abstract
Provided is a differential amplifier circuit with a small circuit size. When a differential voltage (Vinp−Vinn) is higher than a predetermined voltage, a PMOS transistor () is turned ON. At this time, a current source () is connected in parallel to a current source (), and the current source () supplies a drive current to a differential amplifier circuit (). In other words, the current sources (and), rather than only the current source (), supply a total current (I+I) to the differential amplifier circuit () as the drive current. Accordingly, a slew rate of an output voltage (Vout) is increased. Two PMOS transistors and the current source () are simply required for controlling the slew rate of the output voltage (Vout), and hence the differential amplifier circuit () is small in circuit size.