ADAPTATION CIRCUIT FOR LOW NOISE AMPLIFIER AND LOW NOISE AMPLIFIER COMPRISING SUCH CIRCUIT

摘要

One aspect of the invention relates to an impedance matching circuit for being connected to a non-linear impedance comprising a superconductor, said circuit comprising a first terminal said first connection port to be connected to a first terminal of the non-linear impedance, a second terminal said second connection port to be connected to a second terminal of the nonlinear impedance, a third terminal said input / output terminal for receiving the signal to be amplified and a fourth terminal said power supply terminal to be connected to a bias source and configured for a voltage V is applied between the first connection port and the second connection port. The circuit according to the invention comprises a plurality of passive electrical components configured so that the impedance Z (f) between the first connection port (J1) and the second connection port (J2) for a frequency signal fa a part real Re (Z (f)) such that Re (Z (fs)) 0 with fs a first frequency called signal frequency; Re (Z (fi)) 0 with fi a second frequency called idler frequency; Re (Z (0)) h / 4e2 fp / G.BW with fp a third frequency called pump frequency; Re (Z (fp + fs)) fp + fs / fi Re (Z (fi)); the pump frequency being chosen so that nfp = fs + fi with n an integer belonging to [1, + ∞] and the frequency idler being chosen so that fi kBT / h with T the circuit temperature, kB the constant from Boltzmann and the Planck constant.