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. 30, 2002
Filed:
Mar. 24, 2000
Applicant:
Inventors:
Navid Foroudi, Ottawa, CA;
Bent Hessen-Schmidt, Ottawa, CA;
Assignee:
SiGe Microsystems Inc., Ottawa, US;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K 1/760 ;
U.S. Cl.
CPC ...
H03K 1/760 ;
Abstract
A current mode logic circuit having npn transistors coupled to an NMOS current source provides a substantially constant current when controlled by an opamp comparator. A gate of the NMOS current source is directly coupled to an output terminal of the opamp. A source of the NMOS transistor is connected to one of the inputs of the comparator opamp. Another input terminal is connected to voltage source. The opamp compares the two inputs and provides an output signal which ensures that the opamp will provide a substantially constant current source.