Series Damping of Interferometers Using Weak Links
Original Publication Date: 1978-Apr-01
Included in the Prior Art Database: 2005-Feb-20
Earlier work has shown that extrinsic damping of Josephson interferometer devices leads to reduced resonance steps, and is desirable in many circuit applications. The damping approach used up to now consists of putting a resistor in parallel with the M2 inductance. When the resistor is made small enough to critically damp the M2 inductance, the series resonance due to the M3 inductance becomes underdamped. This leads to a second resonance peak at a higher voltage. A series damping resistor would damp both inductances, but is not usable since it would destroy the phase coherence in the interferometer loop.