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公开(公告)号：US3505668A
公开(公告)日：1970-04-07
申请号：US3505668D
申请日：1965-06-01
Applicant: IBM
Inventor： OTTESEN HJALMAR
CPC classification number: H03M1/00 , H03M1/1066
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公开(公告)号：US3495235A
公开(公告)日：1970-02-10
申请号：US3495235D
申请日：1966-03-10
Applicant: IBM
Inventor： OTTESEN HJALMAR
IPC: H03M1/00
CPC classification number: H03M1/42
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3.发明授权Time shared bipolar analog-to-digital and digital - to - analog conversion apparatus 失效时间共享的双极模拟数字到数字和数字 - 模拟转换装置
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Patent Agency Ranking
公开(公告)号：DE1268663B
公开(公告)日：1968-05-22
申请号：DE1268663
申请日：1966-05-05
Applicant: IBM
Inventor： OTTESEN HJALMAR
Abstract: 1,082,610. Analogue-to-digital converters. INTERNATIONAL BUSINESS MACHINES CORPORATION. April 27, 1966 [June 1, 1965], No. 18335/66. Heading G4H. An analogue-to-digital converter of the successive approximation type includes a register 12, a precision power supply 11 generating a reference signal, a resistor network 6 switched by the register to produce a corresponding analogue signal which is applied at a summing junction 7 together with the input signal 5, the output of the junction being applied to a comparator 9, the reference voltage of which is derived from a circuit 10 having switching means connecting either to ground or to the reference signal from 11 according to the sign of the unknown input signal. The reference signal has a value of - 1 volt. The input 92 of comparator 9 is normally connected to ground. If the input 5 is positive, in the initial cycle of operation, the input 91 is positive relative to input 92 and the comparator output 93 does not affect the sign circuit 13. If the input is negative, the input 91 is the more negative and the output 93 switches the sign circuit. This then enters a negative sign bit in the register 12 and switches contact 103 to connect to the reference signal from generator 11. The input 92 then changes from zero volts to a value of - 1 so that the origin for the subsequent operation of the digitizer is changed to - 1. The final value in the register 12 is then the 2's complement of the value of the input signal at 5.
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公开(公告)号：DE3787209D1
公开(公告)日：1993-10-07
申请号：DE3787209
申请日：1987-04-28
Applicant: IBM
Inventor： STICH MICHAEL CHARLES , OTTESEN HJALMAR , RESMAN JOHN BORIS , ANDERSON TODD BARRY
Abstract: A controller for a voice coil motor driven disk file actuator (10) is described. The device has an online adjustable gain characteristic for controlling movement of the actuator assembly and an estimator (56) that estimates actuator velocity and bias. Forward gain is estimated from position and coil current measurements and compared with a nominal value to create an error signal used to adjust the controller and estimator gain characteristics. The control technique allows changes in the open loop system without changing the closed loop performance. By monitoring loop gain it is possible to alter compensator gains to maintain a constant closed loop performance.
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公开(公告)号：DE3787209T2
公开(公告)日：1994-04-21
申请号：DE3787209
申请日：1987-04-28
Applicant: IBM
Inventor： STICH MICHAEL CHARLES , OTTESEN HJALMAR , RESMAN JOHN BORIS , ANDERSON TODD BARRY
Abstract: A controller for a voice coil motor driven disk file actuator (10) is described. The device has an online adjustable gain characteristic for controlling movement of the actuator assembly and an estimator (56) that estimates actuator velocity and bias. Forward gain is estimated from position and coil current measurements and compared with a nominal value to create an error signal used to adjust the controller and estimator gain characteristics. The control technique allows changes in the open loop system without changing the closed loop performance. By monitoring loop gain it is possible to alter compensator gains to maintain a constant closed loop performance.
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