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SI4740 数据表(PDF) 34 Page - Silicon Laboratories

部件名 SI4740
功能描述  Si470X/1X/2X/3X/4X EVALUATION BOARD TEST PROCEDURE
Download  68 Pages
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制造商  SILABS [Silicon Laboratories]
网页  http://www.silabs.com
标志 SILABS - Silicon Laboratories

SI4740 数据表(HTML) 34 Page - Silicon Laboratories

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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 (%).


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