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SI4708 Datasheet(PDF) 9 Page - Silicon Laboratories |
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SI4708 Datasheet(HTML) 9 Page - Silicon Laboratories |
9 / 68 page 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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