Atec Rohde-Schwarz-SMU200A - Manual (Page 19)

Version 08.00, January 2012
Rohde & Schwarz R&S ® SMU200A Vector Signal Generator 19
Internal baseband I/Q (with R&S
®
SMU-B13 option)
The R&S ® SMU-B13 option converts the internal digital baseband signals of the R&S ® SMU-B9/-B10/-B11 into analog signals for driving
the I/Q modulator. It also generates the analog I/Q output signals. One or two R&S ® SMU-B13 can be installed.
The first R&S ® SMU-B13 drives RF path A, the second RF path B. The I/Q output signals are available either for path A or B.
data rate 100 MHz
resolution 16 bit
D/A converter
sample rate 400 MHz (internal interpolation × 4)
with amplitude, group delay and S
i
correction
bandwidth, roll-off to −0.1 dB 40 MHz
D/A converter interpolation spectra
up to 10 MHz < −80 dBc
Aliasing filter
up to 40 MHz < −73 dBc
carrier leakage
setting range −10 % to +10 %
resolution 0.01 %
I ≠ Q (imbalance)
setting range −1 dB to +1 dB
resolution 0.001 dB
quadrature offset
setting range −10° to +10°
I/Q impairment
resolution 0.01°
f > 100 MHz, –20 dBm ≤ level ≤ 10 dBm, I/Q wideband: on, optimize internal I/Q
impairments for RF output: on, optimization mode: high quality
up to 10 MHz < 0.5 dB, 0.1 dB (typ.)
RF frequency response for entire
instrument in modulation bandwidth
up to 40 MHz < 2.0 dB, 0.3 dB (typ.)
up to 10 MHz > 50 dB, 56 dB (typ.) Suppression of image sideband for entire
instrument in modulation bandwidth
3
up to 40 MHz > 40 dB, 50 dB (typ.)
Carrier leakage 3 referenced to full-scale input < −55 dBc, < −65 dBc (typ.)
Additional level uncertainty referenced to
CW measured at 0 dBm with 16QAM, root
cosine filter,
α = 0.5, 10 kHz symbol rate
< 0.2 dB
I/Q outputs
Output impedance
50 Ω
Output voltage EMF (output voltage depends on set
modulation signal) 1 V (V
p
)
Offset EMF < 1 mV
at R
L
= 50 Ω
magnitude
up to 10 MHz 0.02 dB (typ.)
up to 40 MHz 0.03 dB (typ.)
nonlinear phase
up to 10 MHz 0.1° (typ.)
Frequency response 4
up to 30 MHz 0.2° (typ.)
at R
L
= 50 Ω
magnitude
up to 10 MHz 0.01 dB (typ.)
up to 40 MHz 0.02 dB (typ.)
nonlinear phase
up to 10 MHz 0.1° (typ.)
I/Q balance 4
up to 30 MHz 0.2° (typ.)
at R
L
= 50 Ω
SFDR (sine)
up to 2 MHz > 70 dB
up to 20 MHz 60 dB (typ.)
phase noise
10 MHz sine wave at 20 kHz offset −150 dBc (typ.)
wideband noise
Spectral purity
10 MHz sine wave at 1 MHz offset −155 dBc (typ.)
4 Optimize internal I/Q impairments for RF output switched off.