地震勘探仪器中自动校零环路设计  

Discussion on design of automatic offset correction loop in seismic exploration instrument

作　　者：罗运先[1] 吴雄英[1] 寸树苍[1] 郭大江[1] 

机构地区：[1]成都理工大学信息工程学院,成都610059

出　　处：《成都理工大学学报（自然科学版）》2004年第4期395-398,共4页Journal of Chengdu University of Technology: Science & Technology Edition

摘　　要：自动校零环路应用在地震勘探仪器的瞬时浮点放大器中,瞬时浮点放大器为脉冲放大器,用于对采样脉冲串依次放大。瞬时浮点放大器为直接耦合的多级放大器,如何抑制零点漂移是一个需要重点考虑的问题。自动校零环路的设计构想是采用两拍工作方式:在两个采样脉冲的间隔时间进行"零漂记忆",在放大器对采样脉冲进行放大处理时实现"零漂校正"。配合其它校零措施后,该设备零漂指标可达到小于0.25μV的水平。The automatic offset correction loop is used in the instant float-point amplifier. As the pulse (amplifier), the instant float-point amplifier is used in amplifying the series of sampling pulse one by one. The design of the automatic zero-drift correction loop is based on the two-beat operating, which records a zero-drift within the interval between two samples and implements the zero-drift correction during (amplifying) the sample pulse by an amplifier. After applying other zero point offset corrections, the zero point offset of this equipment can reach the level of less than 0.25 μV.

关 键 词：瞬时浮点放大器 地震勘探仪器 A/D转换器 

分 类 号：P631.43[天文地球—地质矿产勘探]