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. 08, 1986
Filed:
Nov. 08, 1984
Applicant:
Inventor:
Richard A Sunderland, Aloha, OR (US);
Assignee:
Spacelabs, Inc., Chatsworth, CA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03F / ;
U.S. Cl.
CPC ...
330297 ; 330300 ;
Abstract
An amplifier circuit with serially coupled output stages coupled to different level voltage supplies wherein at least the higher voltage-supplied output stages comprise a field effect transistor (FET) device is disclosed. In one embodiment a floating power supply is coupled between V.sub.in and the gate of the FET to provide turn on of the FET at the proper crossover voltage. In another embodiment, control of the FET is provided by a transistor circuit which causes the FET to turn on in response to the instantaneous voltage drop across the lower voltage-supplied output stage.