Comparing the Traditional Oscilloscope FFT to Spectrum View Spectrum Analysis for Measuring Power Supply Control Loop Frequency Response

New Tektronix oscilloscopes incorporate spectrum analysis using digital downconverters in each channel. The resulting displays are called Spectrum View. Using Spectrum View to generate Bode plots for power supply control loop frequency response analysis results in improved frequency resolution compared to conventional FFTs. This whitepaper compares Bode plots using built-in digital downconverters (Spectrum View) and traditional FFT, for two different devices under test.