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:
Sep. 17, 1991
Filed:
Jul. 11, 1989
Applicant:
Inventors:
Kazuo Tomizuka, Gunma, JP;
Sakae Sugayama, Gunma, JP;
Takao Saeki, Gunma, JP;
Fumio Sandoh, Tochigi, JP;
Assignee:
Sanyo Electric Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B / ; H04B / ;
U.S. Cl.
CPC ...
455300 ; 455333 ; 357 84 ;
Abstract
A semiconductor integrated circuit for a radio comprises: a front end circuit block (1) including at least an oscillation circuit (1b) and a mixing circuit (1c), for converting an RF signal to an IF signal; and an IF amplifying circuit block (2) for amplifying the IF signal and limiting an amplitude thereof, and the front end circuit block (1) is covered with shield electrodes (17, 17a, 17b, 17c) connected to a predetermined potential.