Tektronix TSG4102A, Руководство пользователя

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List of Figures
Figure 1: Error vector magnitude ................................................................................ 45
Figure 2: ASK constellations .................................................................................... 46
Figure 3: FSK constellations ..................................................................................... 46
Figure 4: Four basic PSK constellations ........................................................................ 48
Figure 5: Phase trellis diagram for binary CPM with a rectangular
fi lter ................................... 49
Figure 6: Constellations for QAM 4 through QAM 256 ...................................................... 50
Figure 7: VSB symbol constellations ........................................................................... 51
Figure 8: Decoding DQPSK transmissions..................................................................... 52
Figure 9: Offset modulation prevents transitions through the origin ........................................ 53
Figure 10:
π /4 DQPSK uses differential encoding and a rotating constellation. ........................... 54
Figure 11: 3 π /8 8 PSK follows standard 8 PSK, but the constellation rotates by 3 π /8 after each symbol 54
Figure 12: Architecture for mapping digital symbols into IQ constellation points ........................ 67
Figure 13: QPSK,3.840Mcps, 1.85 GHz, 0dBm), RMS EVM: 1.7% ....................................... 72
Figure 14: Image 2, QPSK,3.840Mcps, 1.85 GHz, 0dBm), RMS EVM: 1.7% ............................ 73
Figure 15: Option VM03 W-CDMA, (QPSK,3.840Mcps, 2.1425GHz, 0dBm), RMS EVM: 1.7% ..... 74
Figure 16: Image 2, Option VM03 W-CDMA, (QPSK,3.840Mcps, 2.1425GHz, 0dBm), RMS EVM:
1.7% ............................................................................................................ 75
Figure 17: Option VM04 APCO-25, (4FSK-C4FM,4.8KS/s,850MHz, 0dBm), Freq Err: 0.5%......... 76
Figure 18: Option VM05 DECT, (2FSK1.152Mbps,1.925GHz, 0dBm), RMS FSK Err: 1.5%.......... 77
Figure 19: Option VM06 NADC, (
π /4 DQPSK,24.3KS/s,875MHz, 0dBm), RMS EVM: 0.3%......... 78
Figure 20: Option VM07 PDC, ( π /4 DQPSK,21KS/s, 800MHz,0dBm), RMS EVM: 0.6% ............. 79
Figure 21: Option VM08 TETRA, ( π /4 DQPSK,18KS/s, 420MHz, 0dBm), RMS EVM: 0.7% ......... 80
TSG4100A Series RF Signal Generators User Manual iii