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. 02, 1999
Filed:
Nov. 20, 1997
Donald Y Yu, Fremont, CA (US);
Cypress Semiconductor Corporation, San Jose, CA (US);
Abstract
A circuit includes a band-gap reference circuit and a start-up circuit coupled between an output and an input of the band-gap reference circuit. When the output of the band-gap reference circuit is below a start-up voltage threshold, the start-up circuit provides a first voltage at the input of the band-gap reference circuit which, in turn, causes the band-gap reference circuit to produce a desired voltage at the output. When the desired voltage has been reached, i.e., a voltage corresponding to the start-up voltage threshold, the start-up circuit turns off and does not interfere with the normal operation of the band-gap reference circuit. The start-up circuit may include first circuitry configured to produce a first voltage if a voltage signal at the output of the band-gap reference circuit is below the start-up voltage threshold. The start-up circuit may further include second circuitry coupled to the first circuitry and configured to produce a second voltage at the input of the band-gap reference circuit in response to the first voltage. The start-up voltage threshold may be a desirable output voltage, for example approximately 1.25 volts.