Townsend and Townsend and Crew LLP
Delay locked loop for use in synchronous dynamic random access memory
A delay locked loop (DLL) is used to compensate for a skew in a synchronous dynamic random access memory. The delay locked loop includes: a delay model for delaying an external clock signal by the skew to generate a delayed clock signal; a signal generation unit, in response to the external clock signal and the delayed clock signal, for generating control signals; a first delay unit, in response to the control signals, for delaying the delayed control signal to generate a first DLL clock signal, wherein the first delay unit has a large unit delay; and a second delay unit, in response to the control signals, for delaying the first DLL clock signal to generate a second DLL clock signal, wherein the second delay means in a small unit delay.
Hynix Semiconductor Inc.
G G
G11C G11C
inventional inventional
Jung-Il Seong-Hoon
Yang Lee