Spectral regrowth is the spreading of signal bandwidth due to intermodulation distortion. The image on the left shows a WCDMA signal presented to an RF power amplifier. The image on the right shows the output of the power amplifier exhibiting spectral regrowth. The output shows that spectral regrowth varies with time depending on the characteristics of the amplifier input. Viewing data in the joint time-frequency space (a spectrogram) allows one to see power as a function of time and frequency simultaneously.

With Spectro VSA you can

• Save time and money by quickly identifying signal problems
• Observe spectral regrowth as a function of time
• Drill down into trouble spots—extract IQ signals from any fragment of time-frequency space
• Gain unique insights into the time-frequency behavior of signals
• Best in industry spectrogram image generation through “High Definition” signal processing
• Find what IQ characteristics are causing spectral regrowth problems
• Remove spectral regrowth from IQ signals