US 7,321,501 B2
Method for trimming programmable resistor to predetermined resistance
Bei-Hsiang Chen, Hsin-Chu (Taiwan)
Assigned to United Microelectronics Corp., Hsin-Chu (Taiwan)
Filed on Jun. 09, 2005, as Appl. No. 11/160,101.
Prior Publication US 2006/0280016 A1, Dec. 14, 2006
Int. Cl. G11C 17/00 (2006.01)
U.S. Cl. 365—100  [365/104; 365/148; 365/225.7] 8 Claims
OG exemplary drawing
 
1. A method for trimming a programmable resistor to a predetermined resistance, comprising:
(a) applying at least one voltage pulse, which does not completely blow the programmable resistor, to the programmable resistor;
(b) comparing the resistance of the programmable resistor to the predetermined resistance; and
(c) determining whether performing step (a) again will cause the programmable resistor to exceed the predetermined resistance when the resistance of the programmable resistor is lower than the predetermined resistance.