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公开(公告)号：US3495182A
公开(公告)日：1970-02-10
申请号：US3495182D
申请日：1964-01-17
Applicant: BECKMAN INSTRUMENTS INC
Inventor： SMITH LELAND B , WEEKES BARRET B
CPC classification number: H03F3/45479
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公开(公告)号：US3617916A
公开(公告)日：1971-11-02
申请号：US3617916D
申请日：1969-07-24
Applicant: BECKMAN INSTRUMENTS INC
Inventor： SMITH LELAND B
CPC classification number: H03K17/6264 , H03F3/72
Abstract: The invention discloses a new and improved muliplex system wherein each of a multiplicity of inputs are sequentially connected by a switched differential input amplifier stage to a common output amplifier stage. Each input stage is rendered operative and inoperative by a control circuit through which bias current to the input stage is either supplied or denied. The control circuit consists of a switched transistor current source connected to the emitters of a differentially connected pair of transistors comprising the input amplifier stage. The respective transistor collectors of all the input stages are connected in parallel to the common output amplifier stage. The common output stage is composed of a number of transistors connected to provide a differential input and a single ended output. Feedback may be provided from the single ended output to each of the multiple inputs by either an operational or potentiometric configuration. By reason of the switched transistor current source control circuit connected to the differential input stage and the feedback from the single ended output to the multiple inputs, a combined switching speed and amplifier accuracy are provided that heretofore were not possible.
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公开(公告)号：US3304507A
公开(公告)日：1967-02-14
申请号：US34341664
申请日：1964-02-07
Applicant: BECKMAN INSTRUMENTS INC
Inventor： WEEKES BARRET B , SMITH LELAND B
IPC: G11C27/02
CPC classification number: G11C27/026
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