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:
Feb. 17, 2004
Filed:
Jan. 16, 2001
Akihiro Sasabata, Nagaokakyo, JP;
Shigekazu Okamoto, Nagaokakyo, JP;
Motoyasu Nakao, Nagaokakyo, JP;
Murata Manufacturing Co. Ltd, , JP;
Abstract
An SPDT switch used for a communication unit includes first and second terminals, a common terminal, and first and second FETs with Schottky connection gates. The drain of the first FET is connected to the first terminal, and the source of the second FET is connected to the second terminal. The source of the first FET and the drain of the second FET are directly connected to each other, and are then connected to the common terminal. The pinch-off voltage V of the first FET is set to satisfy 0 >V >&agr;−&ggr;, and the pinch-off voltage V of the second FET is set to satisfy 0 >V >&ggr;−&bgr;, where &agr;<&ggr;<&bgr;. A fixed potential &ggr; is applied to the gate of the second FET, and one of potentials &agr; and &bgr; is applied to the gate of the first FET, so that one of the first and second terminals can be electrically connected to the common terminal. Additional resonance and/or switching elements may be included as well.