SMU_dat-sw-en.pdf - 第19页

Version 08.00, Januar y 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 inter nal digital baseband sig…

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Version 08.00, January 2012
18 Rohde & Schwarz R&S
®
SMU200A Vector Signal Generator
I/Q modulation
I/Q modulator
Operating modes external wideband I/Q,
internal baseband I/Q
I offset, Q offset
setting range −10 % to +10 %
resolution 0.01 %
gain imbalance
setting range −1.0 dB to +1.0 dB
resolution 0.001 dB
quadrature offset
setting range −10° to +10°
I/Q impairments
resolution 0.01°
I/Q swap I and Q signals swapped on/off
External wideband I/Q
This type of modulation is possible only in path A.
input impedance 50
VSWR up to 50 MHz < 1.2
input voltage for full-scale input
q
22
i
+= 0.5 V
VV
I/Q inputs
minimum input voltage for ALC state: on 0.1 V
Modulation frequency range I/Q wideband: on 100 MHz
I/Q wideband: on
up to 50 MHz < 6 dB (typ.)
RF frequency response for entire
instrument in modulation bandwidth
up to 5 MHz < 1.0 dB (typ.)
Carrier leakage without input signal, referenced to
full-scale input
3
<
−55 dBc, < −65 dBc (typ.)
measured with 16QAM, root cosine filter, α = 0.5, symbol rate 10 kHz
RMS value
f 200 MHz < 0.3 %
f > 200 MHz < (0.2 % + 0.1 % × f/GHz)
peak value
f 200 MHz < 0.6 %
Error vector
f > 200 MHz < (0.4 % + 0.2 % × f/GHz)
Delta / dB
5
4
3
2
1
0
–1
– 2
– 3
– 4
– 5
Fre
q
uenc
y
offset from carrier / MHz
– 100 10
0
060– 20– 60 20 40 80– 80 – 40
RF 850 MHz
RF 1900 MHz
RF 2200 MHz
Measured frequency response of external wideband I/Q modulation.
3
Value applies after 1 hour warm-up time and recalibration for 4 hours of operation and temperature variations of less than +5 °C.
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
Output voltage EMF (output voltage depends on set
modulation signal)
1 V (V
p
)
Offset EMF < 1 mV
at R
L
= 50
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
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
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.
Version 08.00, January 2012
20 Rohde & Schwarz
R&S
®
SMU200A Vector Signal Generator
Measured frequency response of I/Q outputs.
Measured SFDR of I/Q outputs.