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. 06, 1988
Filed:
Dec. 22, 1986
Applicant:
Inventor:
Stefan Barbu, Caen, FR;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
H03F / ;
U.S. Cl.
CPC ...
330252 ; 330259 ;
Abstract
A high-frequency differential-amplifier stage. The collectors of the transistors (T.sub.1, T.sub.2) are connected to the emitters of two transistors (T.sub.3, T.sub.4) coupled to provide feedback between their collectors and their bases and which are biased by means of resistors (R.sub.1, R.sub.2). This input stage forms a resonant circuit. Two current sources (R.sub.32, T.sub.32, R.sub.31, T.sub.31) improve the operation of this stage in the saturated mode.