◀ Back to Note

Tony's Intertwingled Memex • Reference Manual

Electrical Engineering (Signal Degradation & Attenuation)

Formulas & Definitions

An electrical engineer is analyzing high-frequency AC signal loss across a subsea telecommunications cable subject to inductive noise and dielectric dissipation. The measured output voltage signal V(t)V(t)V(t) (in Volts) over time ttt (in milliseconds) follows a multi-factor decaying wave:

V(t)=e−2tsin⁡(3t)t2+5V(t) = \frac{e^{-2t} \sin(3t)}{\sqrt{t^2 + 5}}V(t)=t2+5​e−2tsin(3t)​

  1. Apply the natural logarithm to both sides of the voltage expression and expand completely using logarithmic product, quotient, and power properties.
  2. Differentiate implicitly with respect to ttt to find an expression for the instantaneous rate of voltage change dVdt\frac{dV}{dt}dtdV​.
  3. Evaluate the exact rate of voltage degradation dVdt\frac{dV}{dt}dtdV​ at t=2 mst = 2\text{ ms}t=2 ms, given that the carrier voltage amplitude at that instant is V(2)≈0.0104 VV(2) \approx 0.0104\text{ V}V(2)≈0.0104 V.