Write Gate With Control Current Coupled to the Storage Loop
Original Publication Date: 1983-Oct-01
Included in the Prior Art Database: 2005-Feb-07
Margins of the write gate in a Josephson storage latch are increased by coupling the control line of the write gate to the storage loop. In memory applications, coupling the DC bias lines to the memory storage loop may also be used to increase margins. The write gate and storage loop of the latch are shown in Fig. 1, where Q1 is the write gate, Ic is the control current, Ig is the gate current, LL is the storage loop inductance, LC is the inductance in the control time, and Lm is the coupling inductance. The threshold curve (solid line) in Fig. 2 is for a write gate with some current stored in the loop and the control current coupled only to the write gate.