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SI4824 데이터시트(PDF) 2 Page - Silicon Laboratories

부품명 SI4824
상세설명  Si4831/35/36/20/24/25-DEMO BOARD TEST PROCEDURE
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제조업체  SILABS [Silicon Laboratories]
홈페이지  http://www.silabs.com
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AN569
2
Rev. 0.3
Figure 2. FM Tuner Setup with Two Generators
FM tuner test equipment lists:

Rohde & Schwarz UPL Audio Analyzer.

Rohde &Schwarz SML01 Signal Generator

Mini-Circuits Power Combiner
2.2. FM Tuner Testing Considerations
Several issues must be considered to make accurate measurements.
First, the power combiner and cable losses must be calibrated and factored into each measurement. The loss for
the Mini-Circuit power combiner is approximately 6 dB.
Second, most signal generators display the voltage generated at the input of the device under test (DUT),
assuming an input resistance of 50
. For example, if the signal generator displays VL = 1 μV (0 dBμV), the
generator source voltage VS is 2 μV (6 dBμV). The load voltage VL is generated from the source voltage VS by the
voltage divider created by the 50
 generator source resistance RS and the 50  load resistance RL. This
distinction is important only for sensitivity, and IP3, which are specified in μV EMF*, where EMF refers to the source
voltage VS. Measurements such as AM suppression, selectivity, and spurious response are relative and may be
referenced using VS or VL. To summarize, the generator displays the voltage at the input of the DUT. Input
impedance for the Si4831/35/36/20/24/25 FM tuner is high, so to convert the value displayed on the signal
generator to EMF, double the voltage (add 6 dB).
*Note:
EMF = Electro Motive Force
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