8.9 THD + Noise

The total harmonic distortion (THD) of a signal is a measurement of the harmonic distortion, and is defined as

the ratio of the sum of the powers of all harmonic components to the power of the fundamental frequency at

the multiplexer output. The on-resistance of the device varies with the amplitude of the input signal and results

in distortion when the drain pin is connected to a low-impedance load. Total harmonic distortion plus noise is

denoted as THD+N. Figure 8-9 shows the setup used to measure THD+N of the devices.

SELx

GND

Dx

Audio Precision

SW

GND

0.1 µF

GND

0.1 µF

50Ÿ

Other

Sx/ Dx

pins

Figure 8-9. THD+N Measurement Setup

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TMUX8212

SCDS434A – OCTOBER 2021 – REVISED DECEMBER 2021

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