Instrument Function
R&S
®
SMU200A
237Operating Manual 1007.9845.32 ─ 15
Note: This setting affects all analog modulations which use the external modulation
source.
SCPI command:
[:SOURce<hw>]:INPut:MODext:IMPedance on page 721
5.5.11.3 Broadband Amplitude Modulation (BB-AM)
With broadband amplitude modulation the I/Q modulator is used for amplitude modula-
tion.
Broadband amplitude modulation (BB-AM) is only possible for Path A.
An external source is always used. The modulation input is the I-input of the I/Q modu-
lator. The sensitivity for broadband amplitude modulation is 0.25V / 100% modulation
depth. It is not possible to set a modulation depth for BB-AM.
It is not possible to use BB-AM simultaneously with:
●
AM,
●
I/Q modulation,
●
arbitrary waveform generation (ARB),
●
digital modulation and
●
digital standards.
The upper level limit for BB-AM is the same as that for I/Q modulation. PEP is up to 6 dB
above the display value, depending on the modulation depth.
Broadband Amplitude Modulation Menu
To open the "Broadband Amplitude Modulation" menu, select "RF/A Mod > Configure >
Broadband Amplitude Modulation" or use the MENU key under "RF/A Mod".
The combined menu "Pulse Modulation/Amplitude Modulation /Broadband AM" provides
access to the Broadband AM configuration in the bottom section.
The top section provides access to the pulse modulation settings; see chapter 5.5.11.6,
"Pulse Modulation (PM)", on page 244.
The middle section provides access to the amplitude modulation settings; see chap-
ter 5.5.11.2, "Amplitude Modulation (AM)", on page 234.
RF Signal and Analog Modulations - RF Block
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