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:
Jun. 26, 1990
Filed:
Mar. 22, 1989
Applicant:
Inventor:
Rolf Bohme, Bad Friedrichshall, DE;
Assignee:
Telefunken Electronic GmbH, Heilbronn, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F / ;
U.S. Cl.
CPC ...
330252 ; 330261 ;
Abstract
In a band-pass amplifier having differential stage comprising two transistors fed from a joint current source, the collector of the first transistor is connected via a resistor to the base of a third transistor complementary to the first and second transistor, and the collector of the second transistor is connected via a resistor to the base of a fourth transistor complementary to the first and second transistor. The emitters of the third transistor and fourth transistor are connected to a supply voltage source, and the collectors of the third and of the fourth transistor form the output terminals of the amplifier.