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:
Apr. 12, 2011
Filed:
Oct. 29, 2007
Noriyuki Fujita, Saitama, JP;
Shigeo Masai, Kanagawa, JP;
Masaharu Sato, Shiga, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An amplifying device for setting input impedance at several GΩ to several tens of GΩ and improving an ESD withstand current rating is provided. An ECM is connected to an input terminaland frequency characteristics become flat to a voice band by high input impedance of a CMOS amplifierand the input impedance is set at several GΩ to several tens of GΩ and thereby, response time after detecting a loud voice or turning on a power source of the ECM is speeded up and desired electrical characteristics are achieved. A path for releasing a surge voltage which occurs during assembly in the outside of an IC and intrudes from the input terminalto a power source terminal or an earth terminal without an influence on a signal (20 Hz to 20 kHz) of a voice band entering from the input terminalcan be constructed by connecting a P-channel MOS transistorand an N-channel MOS transistoras an ESD protective element.