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Multiplexed Sense Amplifier Gating

IP.com Disclosure Number: IPCOM000077927D
Original Publication Date: 1972-Oct-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Davis, RH: AUTHOR [+3]

Abstract

Fig. 1 illustrates a system utilizing multiple sense amplifiers which are time shared. The amplifier outputs are gated together in order to obtain a single output during a given period of time, by selecting the output from one of the amplifiers. Even though the two amplifiers illustrated are active, only one is being used at a given time. This means that all of the gating and latch circuitry attached to the outputs of the various amplifiers must be duplicated for each amplifier, thus requiring numerous components and taking up a good deal of space on an integrated circuit chip and requiring numerous connections. Additional amplifiers could be located between the two amplifiers illustrated, as indicated by the dashed connection lines.

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Multiplexed Sense Amplifier Gating

Fig. 1 illustrates a system utilizing multiple sense amplifiers which are time shared. The amplifier outputs are gated together in order to obtain a single output during a given period of time, by selecting the output from one of the amplifiers. Even though the two amplifiers illustrated are active, only one is being used at a given time. This means that all of the gating and latch circuitry attached to the outputs of the various amplifiers must be duplicated for each amplifier, thus requiring numerous components and taking up a good deal of space on an integrated circuit chip and requiring numerous connections. Additional amplifiers could be located between the two amplifiers illustrated, as indicated by the dashed connection lines.

Fig. 2 illustrates an improved design in which the gating for the amplifiers is placed on their inputs to greatly reduce the number of components utilized. Open collector AND circuits 1 are shown on the inputs of the various amplifiers 2 and only a common shared output latch and gate 3 are required.

The original design shown in Fig. 1 required 28 resistors, 16 capacitors, 12 transistors and 16 logic blocks to provide four amplifiers, while the improved design illustrated in Fig. 2 requires only 18 resistors, 6 capacitors, 9 transistors, and 7 logic blocks for four amplifiers. In addition, the design illustrated in Fig. 2 allows all four amplifiers 2 to be put into a 16-pin integrated circuit package...