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위상 인터폴레이션 기반 시간 영역 8배 인터폴레이팅 Flash ADC의 선형성 개선 방법
이재강(Jae-Kang Lee),김범진(Beom-Jin Kim),오동렬(Dong-Ryeol Oh) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
A time-domain 8-times interpolating flash analog-to-digital converter (ADC) with improved linearity of phase interpolation is presented. In the time-domain interpolation technique, the linearity of the phase interpolation can be degraded by the shoot-through current of the inverter-based phase interpolator. Therefore, in this paper, a shoot-through prevention (STP) technique that can improve the linearity of phase interpolation is proposed. The effectiveness of the proposed STP technique was verified based on a 5-bit 2GS/s time-domain 8-time interpolating flash ADC IP core. Thanks to the proposed STP technique, DNL and INL are improved from 1LSB and 2LSB to 0.1LSB and 0.5LSB, respectively.
김세경,나병호,이기중,박규남,오동렬,박승현,임근우 대한응급의학회 1994 대한응급의학회지 Vol.5 No.2
Dissecting aortic aneurysm is the most fatal disease involving the aorta that can be resulted in a life-threatening outcome unless a prompt diagnosis and an appropriate treatment is done. A retrospective clinical study was done on 51 cases of dissecting aortic aneurysm who had been admitted to department of Emergency Medicine, St. Mary's hospital, Kangnam, CUMC. from Jan, 1990 to Sep. 1994, in aspects of locations of pain, ECGs, and chest X-rays. The mean age at admission was 61.4 years old (range ; 31-88). It was seen more frequently in male than female with M : F ratio of 2 : 1. Hypertension was the most frequent predisposing factor(70.6%). According to the DeBakey classification, type Ⅰ was found in 29.4%, type Ⅱ in 11.4%, type Ⅲ in 58.8%. The most frequent symptom was a pain in 44 cases(86.3%), no pain in 7 cases(13.7%). Painful symptoms were back pain in 25 cases(73%), chest pain in 19 cases(55.9%), epigastric pain in 12 cases(35.3%), abdominal pain in 3 cases(8.8%). Painless symptoms were 5 cases in type Ⅰ, Ⅱ, 2 cases in type Ⅲ. ECG showed normal in 29 cases(56.9%), LVH(Left Vontricular Hypertrophy) in 13 cases(25.5%), BBB(Bundle Branch Block) in 5 cases(9.8%), ST segment depression in 3 cases(5.9%), Atrial fibrillation in 1 cases(1.9%). Mediastinal widenings on chest PA, erect or sitting position, were found in 63%, in comparison with control group.(p<.05). The average mediastinal length was 10.39cm in type Ⅰ, 10.82cm in type Ⅱ, 8.89cm in type Ⅲ. The definitive diagnosis was made by CT, aortography, echocardiography, MRI. Among them 36 cases(70.6%) were treated by medically, in which 3 patients were died. 15 cases(29.4%) were treated by surgically, in which 10 patients were died. Conclusion : Among 51 cases, no ST segment elevation in all cases was found and mediastinal widening on chest PA was found in 63%. It is thought that ECG and chest PA is very important screening method to differentiate acute myocardial infarction from dissecting aortic aneurysm, when patients suffered from acute chest pain visit emergency room.