Transcript 2007 하계 방학 실습

전자의료시스템 및 실습
ADC
구환
경희대학교 전자정보대학 동서의료공학과
Analog-to-Digital Converter(ADC)
• Description
- 아날로그 신호를 디지털 신호로 변경
- 중요한 요소
1. Sampling time
아날로그 신호의 시간 축으로 얼마나 조밀한 간격으로 아날로그
값을 디지털 값으로 변화시킬 것인가를 결정하는 단위
fs >= 2*fmax
2. Quantization level
아날로그 신호의 신호 크기 축으로 얼마나 조밀한 간격으로 디지
털 값을 바꿀 것인가를 결정하는 단위
ex) 8 bit의 경우 28 = 256단계
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
Comparison of Single and Cascaded Operating Modes
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
Input Trigger Description
• Description
- SOC(Start Of Conversion): ADC 시작 신호
- 변환이 시작되면 SOC SEQn bit는 자동으로 clear 된다.
- 현재 동작 중에 SOC 신호가 발생하면, SOC SEQn bit가 set 되고, 한
번더 SOC가 들어오게 되면 두 번째 것은 무시된다.
- 한 번 변환이 시작되면 중간에 멈출 수는 없다. 약속된 변환이 끝나
거나 reset을 이용해서만 변환이 멈출 수 있다.
- Cascaded mode에서는 SEQ1만 사용된다.
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
ADC Clock Pre-scaler(1)
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
ADC Clock Pre-scaler(2)
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
Reference Voltage Bit Selection
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
ADC Conversion Clock Cycles
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea
2007 Summer Seminar
Impedance Imaging Research Center, Kyung Hee University, Suwon, South Korea