전자의료시스템 및 실습

ADC

구 환

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 bit 의 경우 28 = 256 단계

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 bit 는 자동으로 clear 된다 . - 현재 동작 중에 SOC 신호가 발생하면 , SOC SEQn bit 가 set

되고 , 한 번더 SOC 가 들어오게 되면 두 번째 것은 무시된다 . - 한 번 변환이 시작되면 중간에 멈출 수는 없다 . 약속된 변환이 끝나 거나 reset 을 이용해서만 변환이 멈출 수 있다 . - Cascaded mode 에서는 SEQ1 만 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