MIXER CIRCUIT WITH COMPENSABLE HARMONIC CONTENT

摘要

The mixer (10) comprises an input (12) for injecting a first signal, two inputs (14, 16) for a second signal, the potential difference between the two inputs (14, 16) corresponding to the voltage of the second signal or the potential difference between the two inputs (14, 16) being zero; two outputs (18, 20), the potential difference between the two outputs (18, 20) corresponding to a multiplication of the first signal by the second signal; two first superconducting quantum interference elements (22, 24, 26, 28, 30, 32, 34, 36) mounted differentially forming a first doublet, and each linked to one of the outputs (18, 20) and to one of the two inputs (14, 16) for the second signal; and a means for controlling the difference in magnetic flux applied to the two superconducting quantum interference elements (22, 24, 26, 28, 30, 32, 34, 36) of the first doublet, in which at least one of the superconducting quantum interference elements of the doublets (22, 24, 26, 28, 30, 32, 34, 36, 110) is a superconducting component (110), comprising a first superconducting loop (112), the first superconducting loop (112) comprising a first branch (120) comprising a first Josephson junction (132) and a second branch (122) comprising a first DC superconducting quantum interference device (138), in which the first DC superconducting quantum interference device (138) of the or each component (110) comprises a second Josephson junction (150) and a third Josephson junction (156), a critical current (Ic1, Ic2, Ic3) being defined for each Josephson junction (132, 150, 156), the critical current (Ic1) of the first Josephson junction (132) being greater than the absolute value of the difference between the critical current (Ic3) of the third Josephson junction (156) and the critical current (Ic2) of the second Josephson junction (150) and less than the sum of the critical current (Ic2) of the second Josephson junction (150) and the critical current (Ic3) of the third Josephson junction (156), and in which the or each component (110) comprises means for generating magnetic flux (114, 116, 158, 160, 162 and 164) arranged so as to effectively inject magnetic flux into the first superconducting loop (112) and the first DC superconducting quantum interference device (138).