Transient intermodulation distortion (TIM)

TDA2030A

16/23

Doc ID 1459 Rev 2

Figure 28.

TIM distortion versus output power

The diagram of Figure 29 originated by STMicroelectronics can be used to find the slew

rate (SR) required for a given output power or voltage and a TIM design target.

For example if an anti-TIM filter with a cutoff at 30 kHz is used and the max. peak-to-peak

output voltage is 20 V then, referring to the diagram, a slew rate of 6 V/ms is necessary for

0.1% TIM. As shown slew rates of above 10 V/ms do not contribute to a further reduction in

TIM.

Slew rates of 100 V/ms are not only useless but also a disadvantage in hi-fi audio amplifiers

because they tend to turn the amplifier into a radio receiver.

Figure 29.

TIM design diagram (fC = 30 kHz)

Obsolete

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