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. 21, 1984
Filed:
Jul. 01, 1981
Hideo Honda, Yokohama, JP;
Chikara Tsuchiya, Tokyo, JP;
Yoshiaki Sano, Kawasaki, JP;
Toshio Hanazawa, Kawasaki, JP;
Harumi Handa, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A BTL power amplifier comprises main and inverse amplifier units having the same constitution but producing outputs inverted from each other. A low impedance load is directly connected between the output ports of the main and inverse amplifier units. The present BTL power amplifier further comprises a first operation control circuit which activates only the main amplifier unit after the power switch is turned on, and a second operation control circuit which maintains the output port of the inverse amplifier unit in a floating state for a predetermined period of time after the activation of the main amplifier unit is begun. Thus, the present BTL power amplifier produces no pop noise when the power supply is initiated.