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:
Feb. 20, 1996
Filed:
Jan. 19, 1995
Scott W Dalton, Cypress, TX (US);
Compaq Computer Corp., Houston, TX (US);
Abstract
A low quiescent current voltage regulator particularly suited for providing current to the RTC/CMOS memory section of a notebook computer. The gate of the JFET is grounded, the drain connected to the main battery and the source connected to the RTC voltage input of the RTC/CMOS memory section. The JFET source voltage approaches the gate-source cutoff voltage of the JFET. This cutoff voltage is selected to be in the proper range for the RTC/CMOS memory section. A complete RTC voltage control circuit is configured to provide 5 volts from the system voltage when the computer is turned on, 3 to 5 volts from the JFET when the computer is turned off and the main battery is present and 3 volts from the RTC battery when the computer is turned off and the main battery is removed.