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公开(公告)号：US3585633A
公开(公告)日：1971-06-15
申请号：US3585633D
申请日：1968-09-09
Applicant: DRESSER IND
Inventor： YOUNG ROBERT E
Abstract: A reference voltage is applied to the noninverting input of a differential amplifier. The output of the amplifier is connected through a feedback resistor to the inverting input so that the output voltage increases as required to maintain the inverting input at the same potential as the reference voltage. A plurality of resistance branches connect the inverting input to ground. Current through the feedback resistor can be increased incrementally by switching selected resistance branches conductive, thus requiring an increased output voltage in order to maintain the inverting input at the reference voltage. Current through each resistance branch is controlled by a transistor operated in the inverted mode so that the IR drop through the transistor tends to cancel the offset voltage of the transistor. When operated as a digital-to-analog converter, the digital input is used to control the resistance branches and the output of the amplifier produces the analog signal. A step approximation analog-to-digital converter is also described in which the output of the differential amplifier is applied to one input of a comparator and an analog signal applied to one input of a comparator and an analog signal applied to the other input. The resistor branch network is operated by a step approximation logic circuit in a manner to maintain the system balanced. The state of the resistor branch network is representative of the digital output. The reference voltage and analog input voltage may also be reversed.
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公开(公告)号：US3147472A
公开(公告)日：1964-09-01
申请号：US4375560
申请日：1960-07-19
Applicant: DRESSER IND
Inventor： YOUNG ROBERT E
IPC: G06F11/32
CPC classification number: G06F11/325
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公开(公告)号：US3252138A
公开(公告)日：1966-05-17
申请号：US7711860
申请日：1960-12-20
Applicant: DRESSER IND
Inventor： YOUNG ROBERT E
IPC: H04Q9/14
CPC classification number: H04Q9/14
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