Atec Rohde-Schwarz-SMJ100A - Manual (Page 12)

R&S ® SMJ100A Vector Signal Generator Version 05.00, December 2007 12
Wideband amplitude modulation
Operating modes modulation input I external DC
Modulation frequency response as with I/Q modulation –
external wideband I/Q
Input impedance 50 Ω
Input sensitivity peak voltage for 100 % AM 0.25 V
Pulse modulation
Operating modes external,
internal (duty cycle approx. 1:1)
ON/OFF ratio >70 dB
Rise/fall time 10 %/90 % of RF amplitude typ. 1 µs
Pulse repetition frequency 0 Hz to 100 kHz
Video crosstalk spectral line of fundamental of
100 kHz squarewave modulation < −30 dBc
input level rising 1.7 V, falling typ. 1.1 V
input impedance >10 k Ω
Modulation input
EXT MOD A/B
polarity selectable
Frequency modulation (R&S ® SMJ-B20 option)
Operating modes internal, external, internal + external,
AC/DC
0.3 MHz ≤ 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
FM/φM range multiplier
f > 3000 MHz rm = 4
Maximum deviation rm × 10 MHz
Resolution <200 ppm, min. rm × 0.1 Hz
f
mod
= 10 kHz,
deviation ≤ half of maximum deviation
internal <(1.5 % of reading + 20 Hz)
Setting uncertainty
external <(2.0 % of reading + 20 Hz)
FM distortion f
mod
= 10 kHz and 1 MHz deviation <0.1 %
10 Hz to 100 kHz <0.5 dB Modulation frequency response
10 Hz to 10 MHz <3 dB
40 kHz deviation, f
mod
= 1 kHz, f > 5 MHz <0.1 % Synchronous AM
f > 3 GHz <0.2 %
Carrier frequency offset at FM <0.2 % of set deviation
Phase modulation (R&S ® SMJ-B20 option)
Operating mode internal, external, internal + external,
AC/DC, High Bandwidth, High Deviation
High Deviation φM mode rm × 20.0 rad Maximum deviation
High Bandwidth φM mode rm × 1.0 rad
High Deviation φM mode <200 ppm, min. rm × 20 µrad Resolution
High Bandwidth φM mode <0.1 %, min. rm × 20 µrad
f
mod
= 10 kHz,
deviation ≤ half of maximum deviation
internal <(1.5 % of reading + 0.01 rad)
Setting uncertainty
external <(2.0 % of reading + 0.01 rad)
φM distortion f
mod
= 10 kHz, half of maximum deviation <0.2 %, typ. 0.1 %
High Deviation, 10 Hz to 500 kHz <1 dB Modulation frequency response
High Bandwidth, 10 Hz to 10 MHz <3 dB