Phase modulation requires option R&S SMA-B20 (FM/ɸM Modulator) or option R&S SMA-B22 (Enhanced Noise Performance and FM/ɸM Modulator).
![]() | It is not possible to use analog phase modulation simultaneously with digital phase modulation or with analog or digital frequency modulation. See "Simultaneous Operation of Several Modulations or Other Operating Modes" for an overview in detail. |
An internal and/or external source can be selected for phase modulation. Two LF modulation generators and a noise source are available as internal sources in a fully equipped instrument.
The FM/PM EXT input connector for external feed of analog modulation signals is at the front of the instrument. The coupling mode of the input (AC or DC) and the input impedance (50 Ohm or high) can be selected.
The digital PM signal is fed in via the AUX I/O interface.
- "High Bandwidth" mode with full setting range for modulation bandwidth and limited ɸM deviation.
- "High Deviation" mode with full setting range for ɸM deviation and a reduced setting range for modulation bandwidth. Phase noise is reduced in the lower modulation frequency range compared to the default mode.
- "Low Noise" mode with better signal/noise ratio, but reduced setting range for modulation bandwidth and deviation (see data sheet)
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