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Two Phase Shift Register

IP.com Disclosure Number: IPCOM000080984D
Original Publication Date: 1974-Mar-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Berger, HH: AUTHOR

Abstract

A simple semiconductor structure is described ensuring directed coupling, and thus permitting a static stable shift register with injection coupling to be operated in two phases. To this end, the plan view flip-flops F and a pair of P strips Pk serving as a coupling element are arranged in one line. The injectors connected to clock lines Phi 1 and Phi 2, respectively, are each provided with two collectors linked with the Pk strips in the shift direction.

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Two Phase Shift Register

A simple semiconductor structure is described ensuring directed coupling, and thus permitting a static stable shift register with injection coupling to be operated in two phases. To this end, the plan view flip-flops F and a pair of P strips Pk serving as a coupling element are arranged in one line. The injectors connected to clock lines Phi 1 and Phi 2, respectively, are each provided with two collectors linked with the Pk strips in the shift direction.

If 0 1 is positive and 0 2 zero, flip-flop F1 is set. The transistor on the "ON" side, which after having been charged injects into the N-substrate, causes the appertaining Pk strip (on the right of flip-flop F1) to become positive by collecting the injected carriers. The Pk strip also injects (secondary injection), so that flip- flop F2 is precharged to adopt the required position by collecting the injected minority carriers on one side. Thus, information is transferred or shifted from flip- flop F1 to flip-flop F2.

As 0 1 is set off and 0 2 is set on, flip-flop F2 assumes the predetermined position. The Pk strips on the left of flip-flop F2 are grounded, so that flip-flop F1 cannot be coupled to from the left. Flip-flop F1 can subsequently be conditioned for further information from the left. Instead of the collectors on the injector electrode, it is also possible to use one additional collector on each of the flip-flop transistors.

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