PROBLEM TO BE SOLVED: To constantly provide an accurate measured value regardless of time-series fluctuation in the characteristic value of a circuit element.SOLUTION: A living organism state quantity measuring device includes: detection units 2 and 3 which detect information indicating the state of a living organism from the living organism or a living organism sample A taken from the living organism and output the detected information as a current a current/voltage conversion circuit 4 which converts the current output from the detection units 2 and 3 into voltage a double integration A/D conversion circuit 5 which comprises an integration capacitor 53 that is discharged after being charged by the voltage Vsig output from the current/voltage conversion circuit 4, and a counter 55 that measures the charge time and discharge time of the integration capacitor 53, converts the charge time and discharge time measured by the counter 55 into a digital quantity, and outputs the digital quantity and an information processing unit 55 which calculates the quantity of the state of the living organism on the basis of the digital quantity output from the A/D conversion circuit 5.COPYRIGHT: (C)2012,JPO&INPIT【課題】回路素子の特性値の経時的な変動によらずに常に正確な測定値を得る。【解決手段】生体または該生体から採取された生体試料Aから、生体の状態を示す情報を検出するとともに検出した情報を電流として出力する検出部2,3と、該検出部2,3からの出力電流を電圧に変換する電流電圧変換回路4と、該電流電圧変換回路4からの出力電圧Vsigを充電した後放電する積分キャパシタ53と、該積分キャパシタ53の充電時間および放電時間を計測するカウンタ55とを有し、該カウンタ55により計測された充電時間および放電時間をデジタル量に変換して出力する2重積分型のAD変換回路5と、該AD変換回路5から出力されたデジタル量に基づいて生体の状態量を算出する情報処理部55とを備える生体状態量測定装置1を提供する。【選択図】図1
