Josephson and Gate with Tracking Current Inputs
Original Publication Date: 1982-Oct-01
Included in the Prior Art Database: 2005-Feb-10
In the Josephson technology, an AND gate includes OR devices, powered by an AC power supply, at the inputs to the current injection AND device. The injection device is not itself separately powered. The injection device and the symbol for it are shown in Fig. 1, as is its nominal threshold characteristic. I(A) and I(B) are the current inputs at nodes A and B of the device. The OR gates Q1 and Q2 are shown in the circuit of Fig. 2, along with the injection device 10. In order to improve the operating margins of the AND device, a circuit comprising Josephson junctions J1 and J2, together with shunt resistances R1 and R2, is used. This circuit tracks the inputs to the injection AND device.