two-tone-terminator mixer/lo-amplifier t3a-03 - Marki Microwave

TWO-TONE-TERMINATOR MIXERPage 4T3A-03LO/RF 10 MHz to 3.4 GHzIF 1 MHz to 3.4 GHzDownconversion Spurious SuppressionSpurious data is taken by selecting RF and LO frequencies (+mLO+nRF) within the 10 MHz to 3.4 GHz RF/LO bands,which create a 100 MHz IF spurious output. The mixer is swept across the full spurious band and the mean iscalculated. The numbers shown in the table below are for a -10 dBm RF input. Spurious suppression is scaled fordifferent RF power levels by (n-1), where “n” is the RF spur order. For example, the 2RFx2LO spur is 69 dBc for a -10dBm input, so a -20 dBm RF input creates a spur that is (2-1) x (-10 dB) dB lower, or 79 dBc.Typical Downconversion Spurious Suppression (dBc): +10 (+15) dBm Sine Wave LO-10 dBm RF Input 0xLO 1xLO 2xLO 3xLO 4xLO 5xLO0xRF ------------- See LO to IF Isolation and LO Harmonic to IF Isolation Plots (Page 3)1xRF 20 (27) Reference 29 (29) 10 (10) 38 (30) 16 (16)2xRF 70 (70) 71 (75) 71 (73) 72 (79) 68 (71) 70 (80)3xRF 100 (100) 90 (97) 93 (94) 74 (88) 93 (96) 78 (83)4xRF >110 >110 >110 >110 >110 >1105xRF >120 >120 >120 >120 >120 >120A sample downconversion spurious sweep is shown below. An LO 100 MHz higher than the RF is used to create a 100MHz reference IF. A second LO is used to create a 2x2 spurious IF, also at 100 MHz (50 MHz fundamental IF). Thedifference between these two output levels is the spurious suppression in dBc. The mean value across the full 10 MHzto 3.4 GHz RF input band is the number shown in the table above.0-10-20-30-40-50-60-70-80-902RF x 2LO Spurious Suppression (dBc)+10 dBm Sine Wave+15 dBm Sine Wave0 0.5 1 1.5 2 2.5 3 3.5RF Input Frequency (GHz)Downconversion 2RFx2LOSpurious Data Example:RF Input: 10 MHz to 3.4 GHz @ -10 dBmLO for Reference: 110 MHz to 3.5 GHzLO for Spurious: 60 MHz to 3.45 GHzIF Output: 100 MHz4/25/13