THD - Total Harmonic Distortion

Gregory explains what is THD - Total Harmonic Distortion, using the circuit from the last video.

An oscilloscope is used for a THD measurement, and the limitations are shown, as the harmonic distortion of the oscilloscope front-end masks the oscillator THD.

THD is a measurement of distortion, used as the main figure of merit in audio applications, where the non-linear behavior is characterized using the power at the harmonics of the fundamental signal.

Watch my video about Nonlinearity and Distortion
   • Distortion and Nonlinearity Basics  

Watch my explanation about the Wien Bridge Oscillator
   • Wien Bridge Oscillator with AGC and PLL  

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00:18 - Oscillator prototype
01:12 - Circuit behavior
02:12 - Total harmonic distortion
07:10 - THD measurement
07:56 - Measuring distortion with oscilloscope
11:18 - Final circuit details