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Precharge circuit
| Details |
Inventors: Holbrook, Mark D.; Knapp, William K.;
Assignee: RCA Corporation (New York, NY)
Primary Examiner: Davie; James W.
Assistant Examiner:
Attorney, Agent or Firm: Cohen; Samuel, Schanzer; Henry I.
Improved precharge circuit for a dynamic circuit having N, spaced apart, outputs; where N is an integer greater than 2. The conduction path of a precharge transistor is connected between each pair of outputs, whereby (N-1) precharge transistors are connected end-to-end between the N output points. At least one additional precharge transistor is connected between one of the N outputs and a precharge potential point. A common conductor interconnects the control electrodes of all the precharge transistors for, selectively, turning them on concurrently and distributing the precharge potential to all of the N outputs. The end-to-end connection of the N-1 transistors enables the conduction paths of the N-1 transistors and the common conductor to be formed orthogonally to output line conductors connected to the N outputs, thereby enabling the manufacture of a dense and compact circuit. |
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DETAILED DESCRIPTION What is claimed is: 1.
In combination with N separate circuits, where N is an integer greater than 2, each circuit being connected between a different one of N output points and a common point, animproved precharge circuit for selectively and concurrently placing said N output points at, or close to, a selected operating potential, comprising: N-1 transistors, each transistor having a conduction path and a control electrode; means connecting the conductin paths of each one of said N-1 transistors between two, different ones, of said N output points, whereby the conduction paths of said N-1 transistors are connected end-to-end in series; an additional transistor having its conduction path connected between one of said N output points and a point of operating potential; and means connected to the control electrodes of said N-1 transistors and to the control electrode of said additional transistor for selectively turning them on concurrently and distributing the potential at said point of operating potential to said N output points.
2.
The combination as claimed in claim 1 wherein said N separate circuits are formed on an integrated circuit, each one of said N output points being spaced apart on said integrated circuit, and wherein the conduction path of each one of said N-1 transistors is formed between a different pair of said N output points.
3.
The combination as claimed in claim 2 wherein said N separate circuits are formed by and include transistors of one conductivity type; further including a control transistor of said one conductivity type having its conduction path connected between said common point and a point of reference potential; and wherein said N-1 transistors and said additional transistor are of opposite conductivity type to said one conductivity type.
4.
The combination as claimed in claim 3 further including means for selectively and concurrently turning off said control transistor when said precharge transistors are turned-on and turning-on said control transistor when said precharge transistors are turned off
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Image Analysis 
