This paper introduces novel potential device applications based on the nonl
inear phase shifting properties of high-temperature superconductor (HTS) tr
ansmission lines. It demonstrates how the nonlinear characteristics of HTS
materials can be used to build devices that improve the risetime of pulses
as well as exhibit power-dependent phase shifting properties. The nonlinear
transmission-line circuit layouts consist of a linear transmission-line pe
riodically loaded with HTS stubs operating in the nonlinear region. Theoret
ical results are presented using a lumped-element SPICE model to verify the
pulse-shaping concept presented in this paper. The power-dependent phase s
hifting properties are demonstrated with the measurements of two prototype
circuits.