Distortion of Angle-Modulated Signals in Misaligned Linear Filters

Differences in distortion are calculated for sinusoidally phase modulated signals that are passed through dissimilar single-tuned RLC filters. The differences in distortion of two identical signals are related to filter tolerances. A two-tone phase modulated signal is shown to experience significant distortions relative to a single-tone phase modulated signal, although the difference tone is hardly distorted, if passed alone.