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SI4740 数据表(PDF) 34 Page - Silicon Laboratories |
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SI4740 数据表(HTML) 34 Page - Silicon Laboratories |
34 / 68 page AN388 34 Rev. 0.2 3.2.3. THD The total harmonic distortion, or THD, is a measurement of the harmonic distortion present at the audio output and is defined as the ratio of the sum of the powers of all harmonic components calculated in RMS fashion to the power of the fundamental. 1. Connect test equipment as shown in Figure 6 or Figure 7. 2. Configure the tuner: a. Set frequency = 1 MHz. (10 MHz for shortwave and 216 kHz for longwave.) b. Set volume = 63. 3. Configure the audio analyzer: a. Select Analyze. b. Set Function = THD. i. Set Measurement Mode = All di (all harmonics). ii. Set Unit = %. 4. Configure generator #1: a. Set carrier frequency = 1 MHz. (10 MHz for shortwave and 216 kHz for longwave.) b. Select AM Modulation. i. Set AM Modulation Depth = 30%. ii. Set Source = LFGEN. iii. Set LFGEN frequency = 1 kHz. c. Set RF level = 74 dBµV. d. Enable AM modulation. e. Enable RF (carrier). 5. Disable generator #2. 6. Record THD (%). |
类似零件编号 - SI4740 |
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类似说明 - SI4740 |
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