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Current Mode, Logic-Block Ring Circuit

IP.com Disclosure Number: IPCOM000097680D
Original Publication Date: 1961-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

McGee, PL: AUTHOR

Abstract

The current mode, logic-block ring circuit has only one input and can have an even or an odd number of stages. The circuit eliminates skew problems inherent in present ring circuits.

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Current Mode, Logic-Block Ring Circuit

The current mode, logic-block ring circuit has only one input and can have an even or an odd number of stages. The circuit eliminates skew problems inherent in present ring circuits.

The current mode ring comprises N stages, with a minimum of three stages required and no restriction as to the possible number of stages. Each stage comprises three logic blocks in which the first block A1... E1 acts as a gate. The second block A2... E2 and the third block A3... E3 function respectively as the set and reset halves of a D. C. Set-Reset trigger. An input pulse is gated into a stage to set the trigger in that stage only, on the conditions that the preceding stage is on and the stage preceding that one is off. The successive turning on of the stages in sequence is thus assured.

A ring reset pulse turns the first stage on and all others off regardless of the previous condition of the ring. The block in dotted lines provides a reset on signal for the trigger of the first stage.

If the input line goes up when only the trigger of the first stage is on, B1 turns on. This is because it is properly conditioned to gate the input pulse by the line from A2 and the Z line from off block E2 in the stage preceding the first. B1 turns B2 on and holds A2 on until the input pulse is removed. B2 in turning on turns off A3 and turns on B3, advancing the ring. B3 latches B2 on. Upon the removal of the input, B1 and A2 change to off. The on output of B...