Abstract:
An operation method of an all-digital phase-locked loop (ADPLL) includes a step of detecting a phase change of a feedback signal of the ADPLL by using a search window and a step of controlling a closed-loop bandwidth of the ADPLL based on a detected result. A closed-loop bandwidth when the phase change is detected outside of the search window is greater than a closed-loop bandwidth when the phase change is detected within the search window.
Abstract:
Provided are a sealed crystal oscillator and a semiconductor package including the same. The semiconductor package includes: a package substrate; an integrated circuit chip formed on one surface of the package substrate; and a sealed quartz oscillator formed on at least one of the inside, one surface, and the other surface of the package substrate, wherein the sealed quartz oscillator includes a substrate, a quartz blank formed on one surface of the substrate, and a sealing cap covering at least one surface of the quartz blank and including metal.
Abstract:
PURPOSE: A semiconductor integrated circuit and a power supply method thereof are provided to reduce power consumption by combining circuit blocks between a power voltage and the ground in a cascade form. CONSTITUTION: A power voltage generator(110) generates first and second power voltages. The power voltage generator provides the first power voltage to a first power bus. The power voltage generator provides the second power voltage to a power bus. One or more first circuit blocks(120) are combined between the first power bus and the second power bus. One or more second circuits(130,140,150) are combined with the power bus and the ground.
Abstract:
A low voltage data transmission circuit is provided to set voltage signals which are recognized by a receiver more highly than a grounding level of the receiver even when the grounding level of the receiver is higher than a grounding level of the transmission circuit, thereby stably sending signals. A first transmission line(10) transmits a first voltage signal to a receiver(200). A second transmission line(20) transmits a second voltage signal which forms a differential pair with the first voltage signal. A first source resistor(30) is serially connected between the first transmission line and the receiver. A second source resistor(40) is serially connected between the second transmission line and the receiver. A control unit(50) enables voltage levels of the first and second voltage signals to be higher than a grounding level of a receiving side of the receiver, so that the receiver recognizes the higher levels.
Abstract:
인접한 채널 간의 크로스 토크를 줄일 수 있는 고속신호 인터페이스 방법이 개시되어 있다. 고속신호 인터페이스 방법은 클럭신호에 응답하여 송신측으로부터 일련의 디지털 신호를 수신하는 제 1 단계, 클럭신호에 응답하여 디지털 신호를 KL 레벨 PAM 시스템(K, L은 자연수, K≠L)을 사용하여 코드화하는 제 2 단계, 및 클럭신호에 응답하여 제 2 단계를 번갈아 순차적으로 진행한 후 코드화된 디지털 신호를 수신측으로 출력하는 제 3 단계를 구비한다. 따라서, 고속신호 인터페이스 방법은 이웃하는 인터커넥트에 크로스 토크를 발생시키는 인터커넥트 상의 신호의 최대 천이 간격을 줄임으로써 크로스 토크를 줄일 수 있다.
Abstract:
인접한 채널 간의 크로스 토크를 줄일 수 있는 고속신호 인터페이스 방법이 개시되어 있다. 고속신호 인터페이스 방법은 클럭신호에 응답하여 송신측으로부터 일련의 디지털 신호를 수신하는 제 1 단계, 클럭신호에 응답하여 디지털 신호를 KL 레벨 PAM 시스템(K, L은 자연수, K≠L)을 사용하여 코드화하는 제 2 단계, 및 클럭신호에 응답하여 제 2 단계를 번갈아 순차적으로 진행한 후 코드화된 디지털 신호를 수신측으로 출력하는 제 3 단계를 구비한다. 따라서, 고속신호 인터페이스 방법은 이웃하는 인터커넥트에 크로스 토크를 발생시키는 인터커넥트 상의 신호의 최대 천이 간격을 줄임으로써 크로스 토크를 줄일 수 있다.
Abstract:
PURPOSE: A voltage comparator circuit is provided to compensate for exact offset voltage with small quantity of power consumption regardless of operation speed of a system. CONSTITUTION: The first amplifier(110) is designed for compensating for the offset voltage included in the input signal of the voltage comparator. The second amplifier(120) has a negative feedback loop which compensates for the offset voltage included in the output signal from the first amplifier(110) using closed-loop compensation method. The latch comparator(130) digitalize the output signal from the second amplifier(120). The capacitor(C2) is connected to the negative input terminal of the second amplifier(120) and is designed for sampling the offset voltage included in the output signal form the first amplifier(110).
Abstract:
PURPOSE: A method for evaluating amplifier offset of an analog-digital converter is provided which evaluates a degree of generation of the offset in digital values in order to remove the amplifier offset of the analog-digital converter adapted for high-speed signal processing circuits. CONSTITUTION: The first reference voltage applied to the non-inverted input port of an amplifier(18) for evaluating offset is simultaneously applied to the inverted input port of the offset amplifier, and the first reference voltage is supplied to the inverted input port of each of upper and lower offset evaluating amplifiers(16,20). The offset of the offset amplifier is evaluated based on the levels of voltages obtained by dividing the output voltages of the three amplifiers by the voltage division resistors connected between the upper amplifier and the offset amplifier and between the offset amplifier and the lower amplifier.
Abstract:
PURPOSE: Analog operational amplifier has a miller compensation circuit providing a variable output load capacitance. CONSTITUTION: A miller compensation circuit for analog operational amplifier includes a first terminal connected to the operational amplifier, and a second terminal receiving a sum of the capacitance as an input. A first switch array has first group switches commonly connected to the first terminal. A second switch array has second group switches connected in series to the first group switches. A plurality of capacitors are connected in parallel to the second group switches and the second terminal. Third group switches are connected to both ends of the capacitor. Thereby, although the output load capacitance of the operational amplifier is varied, the on-off operations of the switches are controlled, and thus provides a miller compensation capacitance proper to the output load.
Abstract:
본 발명은 증폭회로를 공개한다. 입력신호를 증폭하여 출력하며 제1출력 오프셋을 가지는 적어도 하나의 연산 증폭기를 포함하고, 제1출력 오프셋을 제거하는 기능을 가진 그 증폭 회로는, 제1출력 오프셋과 동일한 제2출력 오프셋을 가지며, 입력신호를 증폭 또는 버퍼링하여 출력하는 오프셋 제거용 연산 증폭기와, 오프셋 제거용 연산 증폭기의 출력을 제1출력오프셋이 증폭되는 정도로 증폭하여 출력하는 증폭수단 및 증폭수단의 출력과 연산 증폭기의 출력을 연산하여 출력하는 연산수단을 구비하고, 제1출력 오프셋과 제2출력 오프셋은 서로 중첩을 이용하여 상살되는 것을 특징으로 하고, 공정상의 변화등에 영향을 받지 않고 출력 오프셋을 완전히 제거시키는 효과가 있다.