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:
Nov. 22, 1983
Filed:
May. 13, 1982
SGS-ATES Componenti Elettronici SpA, Milan, IT;
Abstract
A protective current mirror, with a reflection ratio greater than one, is connected as the active load of an input differential amplifier of a power amplifier. This mirror is provided in addition to the usual current mirror which has its output connected to the drive transistor of the output power amplifier stage. The protective mirror senses the imbalance due to a voltage peak which occurs at an inverted input of the input differential amplifier at the very beginning of the descending portion of a sawtooth input signal ramp voltage and the protective mirror operates a protective transistor which is connected to the base of the power amplifier drive transistor so as to keep one power transistor of the final power amplifier stage in its inactive state. Protection of the output power transistor occurs before the output of the power amplifier has reached its maximum voltage level.