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. 27, 2010
Filed:
May. 20, 2009
Po-hao Huang, Taichung, TW;
Jie-hau Huang, Tai-Chung Hsien, TW;
Po-Hao Huang, Taichung, TW;
Jie-Hau Huang, Tai-Chung Hsien, TW;
eMemory Technology Inc., Hsinchu, TW;
Abstract
A negative voltage level shifter having simplified structure includes a first inverter, a pass unit, a voltage-dividing unit, a second inverter, and a third inverter. The first inverter is powered with a positive supply voltage. Both the second and third inverters are powered with a negative supply voltage. The first inverter inverts an input signal for generating a first internal signal. The pass unit functions to forward the first internal signal to become a second internal signal when the first internal signal has a voltage greater than a threshold voltage. The voltage-dividing unit is employed to generate a third internal signal having a voltage divided from the negative supply voltage and the second internal signal. The second inverter inverts the third internal signal for generating a fourth internal signal. The third inverter inverts the fourth internal signal for generating an output signal.