ContinuousWave

ContinuousWave (opens new window) ramps smoothly to a continuous oscillation and holds until the end of the simulation.

Formula

Let $\sigma_t = 1 / (2\pi f_\mathrm{width})$, $t_0 = \mathrm{offset}\,\sigma_t$, and $\omega_0 = 2\pi f_0$. The source is:

$s(t) = A e^{i\phi} e^{-i\omega_0 t} \frac{1}{1 + \exp[-(t - t_0)/\sigma_t]}$

Because the signal does not decay, the simulation runs for the full run_time.

Parameters

freq0: Frequency of the continuous oscillation.

• Unit: Hz
• Constraint: greater than 0
• Required field

fwidth: Controls the smoothness of the ramp-up.

• Unit: Hz
• Constraint: greater than 0
• Required field

offset: Time delay of the ramp center in units of $1 / (2\pi f_\mathrm{width})$.

• Default: 5

amplitude: Real-valued maximum amplitude.

• Default: 1

phase: Phase shift of the time dependence.

• Unit: rad
• Default: 0