公开(公告)号：CA994914A

公开(公告)日：1976-08-10

申请号：CA138129

申请日：1972-03-27

Applicant: IBM

Inventor： HELLWARTH GEORGE A ,  MILTON JAMES E

IPC: H03M1/52 ,  H03K17/00 ,  H03M1/00

公开(公告)号：CA994915A

公开(公告)日：1976-08-10

申请号：CA220693

申请日：1975-02-20

Applicant: IBM

Inventor： HELLWARTH GEORGE A ,  MILTON JAMES E

公开(公告)号：CA997475A

公开(公告)日：1976-09-21

申请号：CA154491

申请日：1972-10-17

Applicant: IBM

Inventor： MILTON JAMES E

IPC: H03G3/20 ,  H03M1/00

Abstract: Unknown analog signals are coupled through a selectable gain amplifier to an integrating analog-to-digital converter. A first analog-to-digital conversion cycle is performed which sequentially increments counters associated with the converter circuit while the amplifier gain is held at a preselected level. Logic circuitry responds to certain counts in those counters to select an optimum amplifier gain setting to be used during a second conversion cycle. The cycle amplifier gain setting and conversion result are accurately correlated to the amplitude of the unknown analog input. Identity between the gain decision and the first conversion cycle gain setting can be detected to bypass the second conversion cycle.