SI4840 datasheet(7/42 Pages) SILABS

部件名	SI4840

功能描述	Si4822/26/27/40/44-DEMO BOARD TEST PROCEDURE

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制造商	SILABS [Silicon Laboratories]

网页	http://www.silabs.com

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AN603

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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