Atec RohdeSchwarz-SMW200A - Manual (Page 21)

Version 01.02, September 2013
Rohde & Schwarz R&S ® SMW200A Vector Signal Generator 21
Internal baseband characteristics
(R&S
® SMW-B13 or R&S ® SMW-B13T option)
The R&S ® SMW-B13 option provides one I/Q path to the RF section (to RF path A) as well as one analog I/Q output (i.e. one I and one
Q output connector). The R&S ® SMW-B13T option provides two I/Q paths to the RF section (if two RF paths are installed) as well as
two analog I/Q outputs. With two RF paths, R&S ® SMW-B13T is required.
Either R&S ® SMW-B13 or R&S ® SMW-B13T must be installed on the instrument.
D/A converter
Data rate
200 MHz
Resolution 16 bit
Sampling rate 800 MHz (internal interpolation × 4)
Aliasing filter with amplitude, group delay and S
i
correction
Bandwidth, rolloff to –0.1 dB 80 MHz
D/A converter interpolation spectra up to 10 MHz < –80 dBc
up to 80 MHz < –73 dBc
I/Q impairments (digital baseband) These impairments are set in the digital baseband section of the R&S ® SMW200A. They
act on the I/Q signal sent to the I/Q modulator/RF section, as well as on the I/Q signals
at the analog or digital I/Q outputs (of the respective path)..
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°
Resolution 0.01°
Analog I/Q outputs (R&S ® SMW-B13 or R&S ® SMW-B13T option)
Number of I/Q outputs with R&S ® SMW-B13 option 1
with R&S ® SMW-B13T option 2
Output impedance 50 Ω
Output voltage EMF (output voltage depends on set
modulation signal) 1 V (V
p
)
Offset EMF < 1 mV
Frequency response 5 at R
L
= 50 Ω
Magnitude up to 10 MHz 0.02 dB (meas.)
up to 80 MHz 0.03 dB (meas.)
I/Q balance 6 at R
L
= 50 Ω
Magnitude up to 10 MHz 0.01 dB (meas.)
up to 80 MHz 0.02 dB (meas.)
Spectral purity at R
L
= 50 Ω
SFDR (sine) up to 2 MHz > 70 dB
up to 20 MHz 60 dB (meas.)
Wideband noise 10 MHz sine wave at 1 MHz offset –155 dBc (typ.)
Differential analog I/Q outputs (R&S ® SMW-K16 option)
This option can be installed once if the instrument is equipped with the R&S ® SMW-B13 option. If the instrument is equipped with the
R&S ® SMW-B13T option, differential analog I/Q outputs can be used either on signal path A or B with one R&S ® SMW-K16 option. For
differential analog I/Q outputs to be used on signal paths A and B simultaneously, two R&S ® SMW-K16 must be installed.
Output impedance
Single-ended 50 Ω
Differential 100 Ω
Output voltage output voltage depends on set modulation signal
Single-ended EMF 0.02 V to 2 V (V
p
)
Resolution 1 mV
Differential EMF 0.04 V to 4 V (V
pp
)
Resolution 2 mV
5 “Optimize internal I/Q impairments for RF output” switched off.
6 Value applies after 1 hour warm-up time and recalibration for 4 hours of operation and temperature variations of less than +5 °C.