发明授权
- 专利标题: Distortion identification apparatus, test system, recording medium and distortion identification method
- 专利标题(中): 失真识别装置,测试系统,记录介质和失真识别方法
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申请号: US12580114申请日: 2009-10-15
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公开(公告)号: US08290032B2公开(公告)日: 2012-10-16
- 发明人: Koji Asami
- 申请人: Koji Asami
- 申请人地址: JP Tokyo
- 专利权人: Advantest Corporation
- 当前专利权人: Advantest Corporation
- 当前专利权人地址: JP Tokyo
- 代理机构: Chen Yoshimura LLP
- 优先权: JP2008-267911 20081016
- 主分类号: H04Q1/20
- IPC分类号: H04Q1/20
摘要:
Provided is a signal output control section that inputs to a digitizer a reference signal whose frequency changes at each prescribed measurement cycle; a data extracting section that extracts a number of pieces of data corresponding to an integer multiple of a period of the reference signal in each measurement cycle, from pieces of data of a reference digital signal output by the digitizer according to the reference signal that come after a prescribed wait interval has passed since an initiation timing of each measurement cycle; a distortion identifying section that calculates the non-linear distortion caused by the digitizer for each frequency of the reference signal, based on the data in each measurement cycle extracted by the data extracting section; and a distortion calculating section that calculates the non-linear distortion caused by the digitizer when the analog signal input to the digitizer has a frequency that differs from any of the plurality of frequencies at which the reference signal transitions, based on the non-linear distortion detected by the distortion identifying section for each frequency.