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SI4836 数据表(PDF) 7 Page - Silicon Laboratories

部件名 SI4836
功能描述  Si4831/35/36/20/24/25-DEMO BOARD TEST PROCEDURE
Download  40 Pages
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制造商  SILABS [Silicon Laboratories]
网页  http://www.silabs.com
标志 SILABS - Silicon Laboratories

SI4836 数据表(HTML) 7 Page - Silicon Laboratories

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AN569
Rev. 0.3
7
3.5. FM Limiting –3 dB
3.5.1. Description
The test measures the RF input level when audio output level drops by 3 dB from the standard level.
3.5.2. Conditions/Procedure
1. Connect test equipment as shown in Figure 1.
2. Configure the tuner in standard configuration.
3. Configure the audio analyzer:
a. Select Analyze.
b. Set Function = THD+N/SINAD.
i. Set Measurement Mode = SINAD.
ii. Set Unit = dB.
iii. Set Filter = A-weighting.
iv. Set Frequency Limit Low = 300 Hz.
v. Set Frequency Limit High = 15000 Hz.
4. Configure generator:
a. Set carrier frequency = 98 MHz.
b. Set RF level = 94 dBμV.
c. Select FM Modulation.
i. Set FM Deviation = 22.5 kHz.
ii. Set Source = LFGEN.
iii. Set LFGEN frequency = 1 kHz.
d. Enable modulation.
e. Enable carrier.
5. Record the audio output level (dBV) = VAUDIO0.
6. Adjust the signal generator RF level VRF0, until audio output level VAUDIO1 = VAUDIO0–3.
7. FM limiting –3 dB (dBµV) = VRF0.
3.5.3. Pass Criteria
FM Limiting sensitivity for –3 dB audio level drop should be no more than 3 dBµV.


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