摘要:
A delay locked loop for generating an internal clock signal locked to an external clock signal includes: a phase detector for detecting a phase difference between the external clock signal and the internal clock signal; a delay unit controller for generating a control signal and a selection signal in response to an output signal of the phase detector; a variable delay device (VDD), responsive to the control signal and a selection signal, to produce a delayed version of the external clock signal on a VDD output line, the variable delay device being configured such that, if the external clock signal undergoes a change from a first frequency to a second frequency significantly different than the first frequency, then a resultant load on the VDD output line nonetheless remains substantially the same.
摘要:
A delay locked loop for generating an internal clock signal locked to an external clock signal includes: a phase detector for detecting a phase difference between the external clock signal and the internal clock signal; a delay unit controller for generating a control signal and a selection signal in response to an output signal of the phase detector; a variable delay device (VDD), responsive to the control signal and a selection signal, to produce a delayed version of the external clock signal on a VDD output line, the variable delay device being configured such that, if the external clock signal undergoes a change from a first frequency to a second frequency significantly different than the first frequency, then a resultant load on the VDD output line nonetheless remains substantially the same.
摘要:
A semiconductor device and method of forming a pad thereof are provided. The device includes: a substrate; at least one first active region disposed in a first region of the substrate; at least one second active region disposed in a second region adjacent to the first region of the substrate; a plurality of first contacts disposed on the second active region; a first insulating layer disposed on the first active region and between the first contacts; a poly layer disposed on the first contacts and the first insulating layer; a plurality of second contacts disposed on the poly layer in the second region; a second insulating layer disposed between the second contacts and on the poly layer in the first region; and a pad disposed on the second insulating layer and the second contacts.
摘要:
The duty correcting circuit includes a duty cycle corrector, a duty detector and a duty correction code generator. The duty cycle corrector corrects a duty cycle of an input clock signal to generate an output clock signal. The duty detector adjusts a delay time of the output clock signal to generate a sampling clock signal, samples the output clock signal in response to the sampling clock signal to generate sample data, and detects a duty of the output clock signal based on logic states of the sample data. Therefore, the duty correcting circuit precisely detects and corrects a duty of the output clock signal.
摘要:
A delay locked loop circuit and a method for controlling the same including a delay locked loop (DLL) circuit for receiving an external clock signal and generating an internal clock signal synchronized to the external clock signal includes at least two delay chains having different types of delay cells for delaying the external clock signal. Thus, the layout area and power consumption can be reduced, and logic failures can be prevented or minimized by replacement or compensation of the main delay cells.
摘要:
A semiconductor memory device for controlling an operation of a delay-locked loop (DLL) circuit is provided. The semiconductor memory device includes a DLL circuit that receives an external clock signal and that performs a locking operation on the external clock signal and an internal clock signal, thereby obtaining a locked state. A control unit controls the DLL circuit to constantly maintain the locked state during an updating period of an auto-refresh period of an auto-refresh operation for refreshing memory banks.
摘要:
The duty correcting circuit includes a duty cycle corrector, a duty detector and a duty correction code generator. The duty cycle corrector corrects a duty cycle of an input clock signal to generate an output clock signal. The duty detector adjusts a delay time of the output clock signal to generate a sampling clock signal, samples the output clock signal in response to the sampling clock signal to generate sample data, and detects a duty of the output clock signal based on logic states of the sample data. Therefore, the duty correcting circuit precisely detects and corrects a duty of the output clock signal.
摘要:
A semiconductor device and method of forming a pad thereof are provided. The device includes: a substrate; at least one first active region disposed in a first region of the substrate; at least one second active region disposed in a second region adjacent to the first region of the substrate; a plurality of first contacts disposed on the second active region; a first insulating layer disposed on the first active region and between the first contacts; a poly layer disposed on the first contacts and the first insulating layer; a plurality of second contacts disposed on the poly layer in the second region; a second insulating layer disposed between the second contacts and on the poly layer in the first region; and a pad disposed on the second insulating layer and the second contacts.
摘要:
An improved optical baffling device for use with an optical projection system has a base; a plurality of flat reflective surfaces of an equal size on a corresponding member of reflectors mounted on the base, the reflective surfaces being substantially parallel to each other; and the corresponding number of slits disposed in an alternating relationship with the reflective surfaces. A fraction of light from a light source is focused on each of the reflective surfaces and transmitted to a projection screen through a corresponding slit of the optical baffling device. Sine a fraction of light is processed separately, it becomes possible to enhance the optical efficiency of the optical projection system with a reduced amount of modulation of the optical path.
摘要:
A semiconductor memory device for controlling an operation of a delay-locked loop (DLL) circuit includes a DLL circuit that receives an external clock signal and that performs a locking operation on the external clock signal and an internal clock signal, thereby obtaining a locked state. A control unit controls the DLL circuit to constantly maintain the locked state during an updating period of an auto-refresh period of an auto-refresh operation for refreshing memory banks.