Atec RohdeSchwarz-SMW200A - Manual (Page 15)

Version 01.02, September 2013
Rohde & Schwarz R&S ® SMW200A Vector Signal Generator 15
Phase modulation (R&S ® SMW-B20 or R&S ® SMW-B22 option)
R&S ® SMW-B13T must be installed.
Operating mode internal, external, internal + external,
AC/DC, high bandwidth, high deviation,
low noise (with R&S
® SMW-B22 option
only)
φM multiplier (rm) for different frequency
ranges 100 kHz ≤ f ≤ 200 MHz rm = 1
200 MHz < f ≤ 375 MHz rm = 0.25
375 MHz < f ≤ 750 MHz rm = 0.5
750 MHz < f ≤ 1500 MHz rm = 1
1500 MHz < f ≤ 3000 MHz rm = 2
3000 MHz < f ≤ 6000 MHz rm = 4
Modulation source internal, external, internal + external
External coupling AC, DC
Operating modes with R&S ® SMW-B20 option φM mode: high deviation,
φM mode: high bandwidth
with R&S ® SMW-B22 option φM mode: high deviation,
φM mode: high bandwidth,
φM mode: low noise
Maximum deviation φM mode: high deviation
fmod ≤ rm × 10 MHz / deviation rm × 20.0 rad
φM mode: high bandwidth rm × 1.0 rad
φM mode: low noise rm × 0.25 rad
Resolution of setting φM mode: high deviation < 200 ppm, min. rm × 20 µrad
φM mode: high bandwidth < 0.1 %, min. rm × 20 µrad
φM mode: low noise < 200 ppm, min. rm × 20 µrad
φM deviation error f
mod
= 10 kHz, deviation ≤ half of maximum deviation
internal < (1.5 % of reading + 0.01 rad)
external < (2.0 % of reading + 0.01 rad)
φM distortion f
mod
= 10 kHz, half of maximum deviation < 0.2 %, 0.1 % (typ.)
Modulation frequency response high deviation, 10 Hz to 500 kHz < 1 dB
high bandwidth, 10 Hz to 10 MHz < 3 dB
low noise, 10 Hz to 100 kHz < 3 dB
Pulse modulation (R&S ® SMW-K22 option)
If two RF paths are installed (signal paths A and B), pulse modulation can be used either on signal path A or B with one R&S ® SMW-K22
option. For pulse modulation to be used on signal paths A and B simultaneously, two R&S ® SMW-K22 must be installed.
Modulation source external, internal
On/off ratio > 80 dB
Rise/fall time 10 %/90 % of RF amplitude
transition type = fast < 10 ns
transition type = smoothed < 200 ns
Pulse repetition frequency 0 Hz to 10 MHz
Video feedthrough level < 10 dBm < 10 % of RF
< 200 mV (peak-to-peak value)
Pulse overshoot < 10 %