Frequency divider making use of Josephson junction circuits

A frequency divider circuit having a first frequency divider comprising first, second and thrid gate circuits each including a Josephson junction having a gate current path and a control current path, each said Josephson junction, in response to a control current flowing in its control current path, assuming a voltage state in which it presents an impedance to current flowing in its gate current path, and in response to the absence of said control current flowing in said control current path, assuming a zero voltage state in which it presents substantially no impedance to current flowing in its gate current path, the gate current paths of said first and second gate circuits being connected in parallel to each other between first and second parallel connection junctions, the control current path of said third gate circuit being connected between one of said parallel connection junctions and the gate current path of said first gate circuit, a first terminal adapted to be fed with a D.C. current having a sufficient magnitude for bringing said third gate circuit into the voltage state being connected to said one of said parallel connection junctions, a first resistor having a predetermined resistance and connected in series with the control current path of said first gate circuit to form a first series connection, said gate current path of said third gate circuit and control current path of said second gate circuit being connected in series to form a second series connection, and an input terminal receiving an input pulse signal to be frequency divided connected in common to said first and second series connections.