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:
Mar. 14, 2006
Filed:
Apr. 11, 2003
Bruce L. Inn, San Jose, CA (US);
Matthew Weng, Milpitas, CA (US);
Bruce L. Inn, San Jose, CA (US);
Matthew Weng, Milpitas, CA (US);
Micrel, Inc., San Jose, CA (US);
Abstract
A resistance multiplier circuit coupled to a first node of a first circuit for providing a high-value resistance at the first node includes a first transistor, a second transistor being N times larger than the first transistor, and a resistor. In one embodiment, the first and second transistors are NPN bipolar transistors. The first transistor has its base and collector terminals coupled to the first node and an emitter terminal coupled to a second node. The second transistor has a base terminal coupled to the first node, a collector terminal coupled to a positive supply voltage, and an emitter terminal coupled to the second node. The resistor is coupled between the second node and a virtual ground node. When a voltage is applied to the first node, the resistance at the first node is (N+1) times the resistance of the resistor.