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TDA2030-TB5-T Datasheet(PDF) 10 Page - Unisonic Technologies |
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TDA2030-TB5-T Datasheet(HTML) 10 Page - Unisonic Technologies |
10 / 13 page TDA2030 LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 10 of 13 www.unisonic.com.tw QW-R107-004,D TRANSIENT INTER-MODULATION DISTORTION(TIM) Transient inter-modulation distortion is an unfortunate phenomena associated with negative-feedback amplifiers. When a feedback amplifier receives an input signal which rises very steeply, i.e. contains high-frequency components, the feedback can arrive too late so that the amplifiers overloads and a burst of inter-modulation distortion will be produced as in Fig.5. Since transients occur frequently in music this obviously a problem for the designed of audio amplifiers. Unfortunately, heavy negative feedback is frequency used to reduce the total harmonic distortion of an amplifier, which tends to aggravate the transient inter-modulation (TIM situation.) 20 to 40W Amplifier 20 to 40W Amplifier 20 to 40W Amplifier 20 to 40W Amplifier PRE AMPLIFIER POWER AMPLIFIER FEEDBACK PATH INPUT V1 V2 V3 V4 ¦ÂV4 OUTPUT V1 V2 V3 V4 Fig.4 High power active box for musical instrument Fig.5 Overshoot phenomenon in feedback amplifiers The best known method for the measurement of TIM consists of feeding sine waves superimposed onto square wavers, into the amplifier under test. The output spectrum is then examined using a spectrum analyzer and compared to the input. This method suffers from serious disadvantages: the accuracy is limited, the measurement is a tatter delicate operation and an expensive spectrum analyzer is essential. The "inverting-sawtooth" method of measurement is based on the response of an amplifier to a 20KHz saw-tooth wave-form. The amplifier has no difficulty following the slow ramp but it cannot follow the fast edge. The output will follow the upper line in Fig.6 cutting of the shade area and thus increasing the mean level. If this output signal is filtered to remove the saw-tooth, direct voltage remains which indicates the amount of TIM distortion, although it is difficult to measure because it is indistinguishable from the DC offset of the amplifier. This problem is neatly avoided in the IS-TIM method by periodically inverting the saw-tooth wave-form at a low audio frequency as shown in Fig.7. In the case of the saw-tooth in Fig. 8 the mean level was increased by the TIM distortion, for a saw-tooth in the other direction the opposite is true. m2 m1 SR(V/ s) Input Signal Filtered Output Siganal Fig.6 20kHz sawtooth waveform Fig.7 Inverting sawtooth waveform |
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