FM_radio_example_v1p0

FM_radio_example_v1p0 - Dual conversion Example. (example...

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Unformatted text preview: Dual conversion Example. (example from Prof. T. Weldon of UNCC) RF input is for FM radio (88-108MHz) First LO: 80 MHz, first IF: 8-28 MHz (Wideband IF) (THIS IS A FIXED IF) Image: 52-72 MHz (Image reject filter removes this) Second LO: 18.7-38.7 MHz, second IF: 10.7MHz Image: 29.4-49.4 MHz filter must remove this *Note if we use high-side injection (fist LO at 116MHz) the block downconversion would be "inverted" in that the highest freq 108MHz would become the lowest freq (8MHz) in the do Vdd 3 Used in conditional for Description RF Amp RF Mixer Filter1 LNA Filter 2 1st Mixer Per Stage Power Gain (dB)-2.00 12.00-2.00-8.00 NF (dB) 2.00 3.50 2.00 8.30 OIP3 (dBm) 40.00 27.00 40.00 10.70 1dBout (dBm) 30.00 12.50 30.00-4.30 IIP3 (dBm) 42.00 15.00 42.00 18.70 Input Impedence (ohm) 50.00 50.00 300.00 300.00 Output Impedance (ohm) 50.00 300.00 300.00 1000.00 Voltage gain (dB)-2.00 19.78-2.00-2.77 1dBout (Vrms) 7.07 2.31 17.32 0.61 Cascaded Power Gain (dB)-2.00 10.00 8.00 0.00 NF (dB) 2.00 5.50 5.57 6.55 Voltage Gain (dB)-2.00 17.78 15.78 13.01 IIP3 (dBm) 42.00 16.99 16.85 9.76 OIP3 (dBm) 40.00 26.99 24.85 9.76 1dBout (dBm) 30.00 12.49 10.49-5.24 Delta OIP3-1dBout (dB) 10.00 14.50 14.37 15.00 Small Signal Analysis Min detectable signal at detector (mVrms) 20.00 Min SNR @ output (dB) 20.00 Channel bandwidth (kHz) 200.00 53.01 dB Sensitivity (dBm)-92.13 Noise floor (dBm)-112.13 Vin @antenna (uVrms) (@ sensitivity) 5.53 Vo @ detector input (mVrms) (@sensitivity) 0.91 This is a really small signal at the Signal level at output of stage (dBm)-94.13-82.13-84.13-92.13 Noise level at output of stage (dBm)-120.99-105.49-107.42-114.44 SNR at output of stage (dB) 26.86 23.36 23.29 22.31 Preselect Filter Image Reject Filter Large Signal Analysis IIP3 (dBm)-15.88 P1dBin (dBm)-30.83 Pin_max (where IM products = Noise Floor)-47.97 SFDR (dB) 44.17 Vin @antenna (uVrms) 893.72 Vo @dectector input (mVrms) 146.31 Data Converter Requirements Digital baseband implementation loss (dB) 2 Sample rate (kHz) 300 Offset & gain mismatch slop (dB) 2 # of bits of resolution 12 17.317....
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FM_radio_example_v1p0 - Dual conversion Example. (example...

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