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:
May. 03, 2016
Filed:
Jul. 29, 2015
Hitachi, Ltd., Chiyoda-ku, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Provided is a transmission drive circuit which can reduce distortions of a transmission signal and transmission noise, and is isolable from a signal line. A transmission drive circuitincludes a drive transistorand an isolation diodeconnected between a node ncoupled to a signal line SL commonly used to propagate a transmission signal and a reception signal and a power source line HVP, and further includes an isolation diodeand a drive transistorconnected between the node nand a voltage line HVM. Furthermore, the transmission drive circuitincludes a switchconnected between a node nbetween the drive transistorand the isolation diode, and a node nof a ground voltage Vs, and a switchconnected between a node nbetween the drive transistorand the isolation diode, and a node n. When the transmission signal is propagated through the signal line SL, the switchesandare turned off by the clamp switch control circuitsuch that bias current flows through the drive transistor, the isolation diode, the isolation diodeand the drive transistor