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:
Jun. 13, 1989
Filed:
Sep. 29, 1987
Takeji Tokumaru, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
In a barrel shifter for shifting an input data by a given shift count in response to shift signals through series-connected NMOS transistors, it is impossible to obtain a sufficiently high ('1') or low ('0') level output signal at high response speed because of the presence of a threshold voltage of the NMOS transistor. To overcome this problem, the drain of the rearmost NMOS transistor (the output terminal of the shifter) is precharged to a supply voltage V.sub.DD in response to a precharge signal before an input data is shifted. Thereafter, if the input data changes to a '1' level, the rearmost NMOS transistor is turned off to output the precharged voltage V.sub.DD as the '1' level shifted output data. On the other hand, if the input data is at a '0' level, the rearmost NMOS transistor is turned on to output a ground voltage GND as the '0' level shifted output data.