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:
Mar. 05, 2019
Filed:
Feb. 22, 2017
Applicant:
Semiconductor Energy Laboratory Co., Ltd., Atsugi-shi, Kanagawa-ken, JP;
Inventor:
Roh Yamamoto, Kanagawa, JP;
Assignee:
Semiconductor Energy Laboratory Co., Ltd., Atsugi-shi, Kanagawa-ken, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 3/0233 (2006.01); H03K 3/3565 (2006.01); H03K 5/24 (2006.01);
U.S. Cl.
CPC ...
H03K 3/02337 (2013.01); H03K 3/3565 (2013.01); H03K 5/2481 (2013.01);
Abstract
A hysteresis comparator that has a small circuit area and low power consumption is provided. A differential pair in the comparator is formed using transistors each including a back gate. The comparator is configured to apply an inverted signal of a logic value of an output signal of the comparator to the back gate of the transistor. That is, the threshold voltage of the transistor is controlled by the inverted signal. By the change of the threshold voltage, hysteresis can be added to an input comparison voltage.