Star Driver for Josephson Circuits
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Star drivers are often used in Josephson circuits to provide parallel fan-out to a plurality of logic circuits. Fig. 1 shows a Direct-Coupled Logic Star driver whose operation does not depend upon a LI(0) product and is therefore easier to scale to small linewidths. Stages D(1) and D(2) provide isolation and gain, and utilize Josephson tunneling devices J(1), J(2), J(3) and J(4). Stage D(3) is an amplifier which operates similarly to stage D(2). It includes Josephson tunnel devices J(5) and J(6). Gate currents I(G1), I(G2), and I(G3) are provided to D(1), D(2) and D(3), respectively. A parallel fan-out of four is provided to load resistors R(L1), R(L2), R(L3), and R(L4).