5-10 Keysight N5224A/25A Service GuideTheory of OperationSynthesized Source Group Operation5-A4, A15, and A17 13.5 GHz Synthesizer BoardsThe A17 13.5 GHz synthesizer board is included only on 4-port models.The A4, A15, and A17 13.5 GHz synthesizer boards use the 50 MHz referencesignal from the A14 frequency reference board to tune a VCO circuit thatsweeps from 2 GHz to 4 GHz.Refer to Table 5-3 and Figure 5-3 for band numbers and frequencies discussedhere.In bands 2-10, the output of the swept VCO is passed directly or through adivide-by-2, 4, or 8 circuit to produce the output frequencies as listed in Table5-3.In band 6, the output of the swept VCO is passed through a divide-by-4 circuitand then sent to a Direct Digital Synthesizer to produce the output frequenciesfor bands 2-4 as listed in Table 5-3.22 1 12.0037 to 13.2537 24.0074 to 26.5074 12.000 to13.25012.000 to13.25024.000 to26.50023 3 8.8358 to 9.0051 8.8358 to 9.0051 13.250 to13.50413.250 to13.50426.500 to27.00824 3 9.0051 to 10.6691 9.0051 to 10.6691 6.752 to 8.000 13.504 to16.00027.008 to32.00025 3 10.6691 to 13.5025 10.6691 to 13.5025 8.000 to 10.125 16.000 to20.25032.000 to40.50026 3 6.7512 to 7.1106 13.5025 to 14.2211 10.125 to10.66420.250 to21.32840.500 to42.65627 3 7.1106 to 7.2512 14.2211 to 14.5025 10.664 to10.87521.328 to21.75042.656 to43.50028 3 7.2512 to 7.7012 14.5025 to 15.4025 10.875 to11.55021.750 to23.10043.500 to46.20029 3 7.7012 to 8.0012 15.4025 to 16.0025 11.550 to12.00023.100 to24.00046.200 to48.00030 3 8.0012 to 8.3346 16.0025 to 16.6691 12.000 to12.50024.000 to25.00048.000 to50.000Band MixerBrickL.O.Harm.Nmbr.(N)A15SynthesizerFrequency (GHz)A25HMA26.5Frequency (GHz)A4/A17SynthesizerFrequency(GHz)A5/A10SourceFrequency(GHz)A7/A8/A12/A13 50GHzDoublerFrequency(GHz)
