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SI4704 Folha de dados(PDF) 9 Page - Silicon Laboratories

Nome de Peças SI4704
Descrição Electrónicos  Si470X/1X/2X/3X/4X EVALUATION BOARD TEST PROCEDURE
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Fabricante Electrônico  SILABS [Silicon Laboratories]
Página de início  http://www.silabs.com
Logo SILABS - Silicon Laboratories

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AN388
Rev. 0.2
9
Figure 3. Si474x FM Tuner Setup
2.1. FM Tuner Testing Measurement 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 V
L = 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 R
S and the 50  load resistance RL. This distinction is important
only for sensitivity, RDS sensitivity, and IP3, which are specified in µV electromotive force (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. In the case of Si47xx FM tuner, input impedance is high; therefore, to convert the value displayed on the
signal generator to EMF, double the voltage (add 6 dB).
Si47xx
Base board
Si474x
AM/FM Receiver
Daughter board
R&S SML01 Generator 1
Audio
Analyzer
RXS
PC
with USB
port
RCA OUT
USB
J79
USB Cable
RCA Cable
EXT pwr
USB pwr
EXT Jack
SW1
J76
J78
J6
R&S SML01 Generator 2
Agilent
E3646A
Power Supply
1
2
3
4
CH
1
CH
2
Power Connector
1. VMCU
2. VIO
3. VDD
4. GND
Power
Combiner
Digital Audio IN.
J30
Line
SPDIF
OUT
J2


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