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:
Jul. 10, 2012
Filed:
Oct. 12, 2010
Perng-fei Yuh, San Jose, CA (US);
Pokang Wang, Los Altos, CA (US);
Lejan Pu, San Jose, CA (US);
Minh Tran, San Jose, CA (US);
Chao-hung Chang, Gilroy, CA (US);
Perng-Fei Yuh, San Jose, CA (US);
Pokang Wang, Los Altos, CA (US);
Lejan Pu, San Jose, CA (US);
Minh Tran, San Jose, CA (US);
Chao-Hung Chang, Gilroy, CA (US);
MagIC Technologies, Inc., Milpitas, CA (US);
Abstract
Systems and methods for realizing current drivers without current or voltage feedback for devices that require accurate current drive with zero standby current has been disclosed. In a preferred embodiment of the invention this current driver is applied for write circuits for MRAMs. A fast and accurate reference current is generated by diode voltage divided by resistor without any feedback. The diode current is not fed back from the reference current. The diode current is generated from a regulated voltage. Temperature compensation of the write current is inherently built in the diode current reference. Fine-tuning of the temperature coefficient is achieved by mixing poly and diffusion resistors. A switch inserted in the current driver can turn on the driver fast and without a need for standby current. Leading boost in the current driver can fast charge the large coupling capacitance of word and bit lines and speed up write timing.