Abstract:
A self test device built in a phase-locked loop, the package locked loop including the same, a testing method thereof, and a storage medium storing the same are provided to test an internal defect with small hardware overhead by using only digital signal inside the phase-locked loop by calculating a hamming distance. A built-in self test device(100) of a phase locked loop includes a first shift detection unit(110a,110b,110c), and a second shift detection unit(120a,120b,120c) and a shift frequency calculation unit(150). The first shift detection unit receives an original output signal of a voltage controlled oscillator of the phase-locked loop and the division signals dividing the frequency of the original output signal from a frequency divider and outputs the level shift between the signals in a digital type. The second shift detection unit. The second shift detection unit outputs the level shift in the digital type by comparing the level shift outputted from the first shift detection unit and the level shift previously outputted from the first shift detection unit. The shift calculation unit calculates the shift frequency through the output value of the second shift detection unit and determines the defect of the phase-locked loop.
Abstract:
본 발명은 테스트 시간을 짧게 하면서도, 기존의 방법보다 하드웨어 오버헤드를 줄인 아날로그디지털 변환기(ADC)에 대한 내장된 자체 테스트 방법(BIST: Built-in Self-test)에 관한 것이다. 본 발명에 따르면, 램프신호를 테스트 신호로 사용함으로써 저장해야 하는 레프런스값을 하나로 할 수 있다. ADC의 정적 파라미터인 옵셋, 이득, DNL, INL을 히스토그램 방법을 이용하여 계산하는 식을 제시하였고 이 식들의 연관성을 이용하여 하드웨어 오버헤드를 줄일 수 있었다. 정적 파라미터들을 계산하기 위해 와 을 계산하는 구조가 필요한데, 이것을 위해 하나의 카운터 및 다운카운터를 사용하였다. 두개의 카운터를 통해 간단하게 정적 파라미터를 계산함으로써 하드웨어 오버헤드를 기존의 방법들보다 줄일 수가 있다. ADC BIST, Analog to digital converter, Built-in self-test, analog testing
Abstract:
A histogram based ADC(Analog-Digital Converter) BIST(Built-In Self-Test) for hardware overhead optimization is provided to perform a test with an operation speed by applying the BIST to an ADC test. A histogram based ADC(Analog-Digital Converter) BIST(Built-In Self-Test) for hardware overhead optimization includes a signal generator(20), a comparator(40), and a result analyzer(30). The signal generator generates a test signal applied to the input of an ADC(10). The comparator outputs a test end signal when the signal generated from the signal generator reaches maximum voltage. The result analyzer outputs an offset, a gain, and an NL(Differential/Integral non-linearity) value by analyzing the output of the ADC. The result analyzer has a transition detector to detect the generation of transition through the LSB(Least Significant Bit) of the output of the ADC, and a counter device to count transition signals outputted from the transition detector.
Abstract:
PURPOSE: A method for testing a dual port memory is provided to enhance productivity by detecting all kinds of fault models detected through a function test, and to carry out a test in a short time without an additionally extended length relating to a test algorithm for testing a single port memory. CONSTITUTION: An object fault model of the dual port memory is decided. In case of the fault such as the 2PF1, the 2PF2v, and the 2PF2a, a March-C algorithm is applied through one port and an operation reading a same cell is simultaneously executed through the rest port whenever executing a reading operation. When a writing operation is executed through one port while applying the March-C algorithm in order to detect the 2PF2av, the reading operation is added to the object joining cell through the rest port. The reading operation is added to the March-C algorithm, the reading operation is simultaneously executed through two ports, and the reading operation is added to the object joining cell through the rest port when the reading operation is executed through one port. The algorithm is formed in order to equally execute the reading and the writing operation to the two ports.
Abstract:
제1 비교부에인가된 TSV(Through-Silicon-Via)를통과한전압을측정하여 TSV의단락불량유무를판별하고, 제2 비교부에인가된 TSV를통과한전압을측정하여 TSV의개방불량유무를판별하며, 제1 비교부및 제2 비교부의각각의출력을기초로하여, TSV의불량여부를판별하는 TSV 테스트및 분석회로를제공한다.