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. 19, 1983
Filed:
Jul. 13, 1979
Naotoshi Higashiyama, Tokyo, JP;
Kazuyuki Doi, Tokyo, JP;
Nippon Electric Co., Ltd., Tokyo, JP;
Abstract
A semiconductor chip contains a multi-channel signal-processing circuit for processing signals in different frequency bands (e.g., an AM and an FM receiver). An inductor is coupled via an external terminal on a package for the semiconductor chip to a first signal-processing circuit. A circuit detects when a connection is made between the inductor and a power supply terminal contained in the semiconductor chip. When the inductor is connected to the power supply terminals, the first signal-processing circuit is activated, while the second signal-processing circuit is deactivated. When the inductor is disconnected from the power supply terminal, the second signal-processing circuit is activated, while the first signal-processing circuit is deactivated. The circuit for detecting a connection between the inductor and the power supply terminal is either a circuit for detecting a potential change or a circuit for detecting an oscillating signal. The inductor may be either an oscillator coil or an IF transformer winding.