For this case, AWGN noise is added with C/N = 5dB.
When noise is added, the DVB-S sensitivity is better than -85dBm for 4.42Msps, and better than -77.5dBm for 27.5Msps across the band. The DVB-S sensitivity without noise is better than -92.5dBm for 4.42Msps, and better than -84dBm for 27.5Msps across the band.įigure 4. Measured at RF input port with 50MHz increment step from 925MHz to 2175MHzĭVB-S system measurements for the MAX2120 Half-NIM are made by connecting to a DVB-S demodulator.įigure 3.
Local Oscillator Signal Leakage at RF Input Terminal The IM2 tone at 5MHz is measured at baseband. Two tones at -20dBm each are applied at 925MHz and 1250MHz. GC1 set to provide the nominal baseband output drive when mixing down a -23dBm tone at 2175MHz to 5MHz baseband (f LO = 2170MHz). The IM3 tone at 5MHz is measured at baseband. Two tones at -20dBm each are applied at f LO -100MHz and f LO -195MHz. GC1 set to provide the nominal baseband output drive when mixing down a -23dBm tone at 2055MHz to 5MHz baseband (f LO = 2050MHz). The IM3 tone at 2MHz is measured at baseband. Two tones at -26dBm each are applied at 2056MHz and 2060MHz. Measured at 2MHz filter bandwidth set to 22MHz Test conditions include V CC =+3.3V RF input signals as specified in the following table default register settings and T a = +25☌. System block diagram Lab Measurements Supply Current Parameter
Active Loop-Through Using a Discrete LNAįigure 2.A Popular Form Factor Often Used in the Chinese DVB-S Market Can Be Adopted Without Physical Modifications.DVB-S Half-NIM reference design features the MAX2120 tuner. DVB-S Half-NIM Tuner Reference Design Uses the MAX2120 Tunerįigure 1.
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