公开(公告)号：DE3688279D1

公开(公告)日：1993-05-19

申请号：DE3688279

申请日：1986-12-10

Applicant: ADVANTEST CORP

Inventor： YAMAGUCHI TAKAHIRO ,  ARAKAWA NORIO ,  OHGAMI TAKAYUKI ,  KOSAWA HIROMI

IPC: H03M1/04 ,  H03M1/00 ,  H03M1/20

Abstract: In an AD converting device in which an analog random noise is added by analog adding means (12) to an analog signal (X) to be converted and the added output is converted by an AD converter (15) to a digital signal, an analog offset voltage (0), whose level variation is around (1 to 7) times the quantization step size A of the AD converter, is generated by offset generating means (21) and is also applied to the analog adding means. A random noise waveform is stored in a memory (13), the read-out output of which is converted by DA converting means (14) to an analog random noise having an amplitude about (1 /2 to 6) A, and the converted output is used as the above-said random noise. A digital value of the offset voltage and the digital noise waveform are subtracted from the output of the AD converter, as required.

公开(公告)号：DE3882014T2

公开(公告)日：1993-11-18

申请号：DE3882014

申请日：1988-11-18

Applicant: ADVANTEST CORP

Inventor： YAMAGUCHI TAKAHIRO ,  KASAHARA TOSHIHARU ,  KOSAWA HIROMI

IPC: G01R27/28 ,  G01H17/00 ,  G01M7/02 ,  G01R23/16

公开(公告)号：DE3688279T2

公开(公告)日：1993-11-18

申请号：DE3688279

申请日：1986-12-10

Applicant: ADVANTEST CORP

Inventor： YAMAGUCHI TAKAHIRO ,  ARAKAWA NORIO ,  OHGAMI TAKAYUKI ,  KOSAWA HIROMI

IPC: H03M1/04 ,  H03M1/00 ,  H03M1/20

Abstract: In an AD converting device in which an analog random noise is added by analog adding means (12) to an analog signal (X) to be converted and the added output is converted by an AD converter (15) to a digital signal, an analog offset voltage (0), whose level variation is around (1 to 7) times the quantization step size A of the AD converter, is generated by offset generating means (21) and is also applied to the analog adding means. A random noise waveform is stored in a memory (13), the read-out output of which is converted by DA converting means (14) to an analog random noise having an amplitude about (1 /2 to 6) A, and the converted output is used as the above-said random noise. A digital value of the offset voltage and the digital noise waveform are subtracted from the output of the AD converter, as required.

公开(公告)号：DE3882014D1

公开(公告)日：1993-07-29

申请号：DE3882014

申请日：1988-11-18

Applicant: ADVANTEST CORP

Inventor： YAMAGUCHI TAKAHIRO ,  KASAHARA TOSHIHARU ,  KOSAWA HIROMI

IPC: G01R27/28 ,  G01H17/00 ,  G01M7/02 ,  G01R23/16