Abstract:
PURPOSE: A dynamic bias current famine type inverter and a low power delta-sigma modulator using the same are provided to minimize an output error by offering high gain while minimizing power consumption. CONSTITUTION: A dynamic bias current famine type inverter cascade-interlinks first PMOS(P-channel Metal Oxide Semiconductor) transistors(300,330) and second PMOS transistors(310,320). The dynamic bias current famine type inverter cascade-interlinks first NMOS(N-channel Metal Oxide Semiconductor) transistors(210,230) and second NMOS transistors(200,220). First bootstrap capacitors(100,120) are installed between a gate of the first PMOS transistor and a gate of the second PMOS transistor. Second bootstrap capacitors(110,130) are installed between the gate of the second NMOS transistor and the first NMOS transistor.
Abstract:
본발명은깜빡임현상이개선된 LED 조명장치에관한것으로, 두개의병렬연결되는컨버터방식의 LED 구동회로를활용하여항상 LED 부하(load)에거의일정한전류를공급함으로써, AC입력전원을사용할경우발생할수 있는깜빡임(flicker) 현상을제거하고, 동시에높은역률(power factor)을달성할수 있도록한 것이다.
Abstract:
본발명에따른직접디지털주파수합성기는, 입력클럭의주파수와출력클럭의주파수사이의비율을나타내는주파수비율값을적어도이용하여상기입력클럭으로부터상기출력클럭을생성하는직접디지털주파수합성기로서,상기주파수비율값을입력받아서상기주파수비율값의정수부분과상기주파수비율값의소수부분을출력하되디더링된결과를출력하는디바이더머지드델타시그마모듈레이터(10); 상기정수부분을이용하여상기입력클럭으로부터상기입력클럭이상기정수부분에해당하는만큼분주된중간클럭을생성하는인티저디바이더(20); 상기소수부분을이용하여상기중간클럭으로부터상기출력클럭을생성하되, 상기중간클럭의에지가상기소수부분에대응하는만큼쉬프트되도록생성하는프랙셔널디바이더(30);를포함하는것을특징으로한다.본발명에따르면디스플레이포트처럼매우큰 M, N값을이용하여주파수를합성하는경우에도용이하게원하는주파수를합성할수 있으며, 낮은루프필터대역폭등으로인한성능저하의문제를해결할수 있으며, 넓은범위의주파수를생성할수 있는효과가있다.