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. 21, 2015
Filed:
Oct. 16, 2013
Murata Manufacturing Co., Ltd., Nagaokakyo-shi, Kyoto-fu, JP;
Tsutomu Kobori, Nagaokakyo, JP;
Shigeki Koya, Nagaokakyo, JP;
Akishige Nakajima, Nagaokakyo, JP;
Yasushi Shigeno, Nagaokakyo, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A semiconductor apparatus includes multiple field effect transistors provided between an antenna terminal to be connected to an antenna and multiple external terminals through which RF signals are capable of being supplied and a voltage generating circuit. When the field effect transistors provided between one of the multiple external terminals and the antenna terminal are turned off, the voltage generating unit charges a capacitor via a resistor circuit by switching the polarity of the RF signal to be supplied to the other external terminal with respect to the control signal and outputs a voltage based on a sum of the charge voltage and the voltage of the control signal as the gate drive voltage. The resistor circuit includes a first resistor including positive temperature characteristics and a second resistor including negative temperature characteristics.