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:
Nov. 23, 1993
Filed:
Feb. 26, 1992
Hiroaki Tanaka, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A substrate potential adjusting apparatus of the invention includes: a pump circuit for drawing a current from a semiconductor substrate to adjust a substrate potential; ring oscillators for supplying a periodical signal to the pump circuit and causing the pump circuit to operate; a limiter circuit for detecting a potential of the semiconductor substrate and controlling to switch between operation and non-operation of the ring oscillators in accordance with the detected potential; and a selector circuit for changing the oscillation period of the periodical signal outputted from the ring oscillators in accordance with a signal inputted externally from a chip, the signal determining an operation mode of a circuit formed on the semiconductor substrate.