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. 24, 1990
Filed:
Apr. 29, 1988
Soo-In Cho, Suwon, KR;
Dong-Sun Min, Seoul, KR;
Samsung Electronics Co., Ltd., Suwon, KR;
Abstract
A circuit for generating a back bias voltage for use in a semiconductor memory device is disclosed, wherein the back bias voltage is clamped within a desired voltage level. The circuit comprises an oscillator for generating a sequence of square waves having a specified frequency, a buffer adapted to be connected with the output of said oscillator and for buffering the output of said oscillator into the square waves having a level of a source supply voltage, a charge pump circuit for providing a back bias voltage by receiving the output of said buffer, and a clamping circuit adapted to be coupled in parallel between the output of said charge pump circuit and a ground level and for clamping within a specified range the back bias voltage being provided by said charge pump circuit in accordance with variations of said source supply voltage.