PHYSICAL QUANTITY MEASUREMENT DEVICE AND ELECTRONIC APPARATUS

• Main Authors: YONEZAWA TAKEMI, ITO SATORU, OGUCHI YASUHIRO
• Format: Patent
• Language: English; Japanese
• Published: 14.05.2015
• Subjects: AMPLIFIERS; BASIC ELECTRONIC CIRCUITRY; CODE CONVERSION IN GENERAL; CODING; DECODING; ELECTRICITY; GYROSCOPIC INSTRUMENTS; MEASURING; MEASURING DISTANCES, LEVELS OR BEARINGS; NAVIGATION; PHOTOGRAMMETRY OR VIDEOGRAMMETRY; PHYSICS; SURVEYING; TESTING

PROBLEM TO BE SOLVED: To provide an integrated circuit device which realizes highly accurate A/D conversion of a signal corresponding to a difference between first and second signals in the case where a channel signal of a sensor device is constituted of the first and second signals, and further to provide an electronic apparatus.SOLUTION: An integrated circuit device includes: an amplifier circuit AMP which is input with a first signal SG1 from a sensor device 10 in a first period, is input with a second signal SG2 constituting a channel signal of the sensor device 10 by forming a pair with the first signal SG1 in a second period and outputs a signal AMQ corresponding to a difference between the first signal SG1 and the second signal SG2; and an A/D converter ADC for performing A/D conversion for the output signal AMQ of the amplifier circuit AMP. The amplifier circuit AMP is constituted of a switched capacitor circuit for canceling an off-set voltage of an operational amplifier possessed by the amplifier circuit AMP. 【課題】センサーデバイスのチャネル信号が第１、第２信号で構成される場合に第１、第２信号の差分に対応する信号の精度の高いＡ／Ｄ変換を実現する集積回路装置及び電子機器を提供する。【解決手段】集積回路装置は、センサーデバイス１０からの第１信号ＳＧ１が第１期間において入力され、第１信号ＳＧ１とペアーとなってセンサーデバイスのチャネル信号を構成する第２信号ＳＧ２が第２期間において入力され、第１信号ＳＧ１と第２信号ＳＧ２の差分に対応する信号ＡＭＱを出力する増幅回路ＡＭＰと、増幅回路の出力信号についてのＡ／Ｄ変換を行うＡ／Ｄ変換器ＡＤＣを含む。増幅回路は、増幅回路が有する演算増幅器のオフセット電圧をキャンセルするスイッチドキャパシター回路により構成される。【選択図】図１