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:
May. 18, 2004
Filed:
Sep. 03, 2002
Michael J. Mottola, San Jose, CA (US);
Karl M. Schlager, Campbell, CA (US);
Micrel, Inc., San Jose, CA (US);
Abstract
A bootstrap reference circuit includes a shunt regulator for generating a reference voltage at a first node, a current source generating a current, and a current mirror coupling the current to the shunt regulator for supplying the shunt regulator. In operation, when the shunt regulator is powering up, the current has an increasing magnitude when a voltage at the first node is less than a predefined voltage value where the predefined voltage value is less than the reference voltage. Furthermore, the current has a decreasing magnitude when the voltage at the first node is greater than the predefined voltage value. In one embodiment, the shunt regulator includes a bandgap reference circuit and the predefined voltage value is less than the bandgap voltage of 1.24 volts.