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Long-Line Driver Receiver

IP.com Disclosure Number: IPCOM000042374D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Heidel, DF: AUTHOR

Abstract

Using a latching injection gate, and adding a terminating impedance to attenuate the relatively large disturbs generated by the switching of the receiver, provides a high density, high speed, crosstalk-immune driver/receiver for Josephson junction circuits. The prior design of long-line driver/receiver circuits, which uses a non-latching injection gate, has the following disadvantages: 1) DISTURB IMMUNITY: The circuits are susceptible to switching by disturbs. In particular, disturbs generated by cross-talk between lines or disturbs which are created by switching the long-line receiver can be reflected off the driver and arrive at the receiver during the next logic cycle. These disturbs can switch the receiver in this cycle. 2) SPEED: The circuits are slow.

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Long-Line Driver Receiver

Using a latching injection gate, and adding a terminating impedance to attenuate the relatively large disturbs generated by the switching of the receiver, provides a high density, high speed, crosstalk-immune driver/receiver for Josephson junction circuits. The prior design of long-line driver/receiver circuits, which uses a non-latching injection gate, has the following disadvantages: 1) DISTURB IMMUNITY: The circuits are susceptible to switching by disturbs. In particular, disturbs generated by cross-talk between lines or disturbs which are created by switching the long-line receiver can be reflected off the driver and arrive at the receiver during the next logic cycle. These disturbs can switch the receiver in this cycle. 2) SPEED: The circuits are slow. 3) SIZE AND COMPLEXITY: The pair of circuits uses a total of five logic gates including a special non-latching injection gate and a filter that require a long inductor and a capacitor. This design (Fig. 1) of a long-line driver-receiver has a latching 0.200 mA injection gate similar to buffers used in OR gates. The latching circuit has the advantage of switching much faster than the ion-latching device and eliminates the need for the filter on its input. (The filter was needed to eliminate the high frequency oscillations generated by the resetting of the non-latching circuit.) The disadvantage of using a latching circuit is that larger disturbs are generated by the switching of the re...