Atec Rohde-Schwarz-SMIQ Series - Manual (Page 8)

8 Vector Signal Generator R&S SMIQ – Specifications
Digital modulation
Digital modulation with optional Modulation Coder R&S SMIQB20
Modes internal, external serial, external parallel
Predefined modulation settings APCO C4FM, APCO CQPSK, CDPD, CT2, DECT, GSM, IRIDIUM,
NADC, PDC, PHS, TETRA, TFTS, PWT, ICO BPSK, ICO GMSK,
ICO QPSK, GSM EDGE, CDMA IS-95, WCDMA, QPSK
Internal PRBS selectable lengths: 2 9 −1, 2 15 −1, 2 16 −1, 2 20 −1, 2 21 −1 and 2 23 −1
I/Q bandwidth 12 MHz
Modulation specifications apply at levels ≤8 dBm (PEP) with R&S SMIQ02B/03B and at levels ≤5 dBm (PEP) with
R&S SMIQ04B/06B
Total level uncertainty at levels >
−127 dBm with
digital modulation, crest factor <20 dB 2) 3)
f ≤2,5 GHz
f >2,5 GHz to 4 GHz
f >4 GHz
<0.7 dB
<1.2 dB
<1.5 dB
For best short time repeatability use ALL OFF mode table
Clock generation
Clock mode
Resolution
Error internal or external
0.001 Hz
<2
−42 , related to reference frequency
Inputs DATA, BIT CLOCK, SYMBOL CLOCK, PAR DATA
Serial data are taken from BNC connectors, parallel data (symbols) from rear PAR DATA connector. Parallel symbols may
contain 1 to 8 bits and read in using an internal or external clock signal
Trigger threshold
Input impedance
Max. data rate, serial
Max. symbol rate, parallel
−2.5 V to +2.5 V, selectable, resolution 0.01 V
1 k
Ω to ground, 50 Ω to ground
30 MHz, 50 MHz typ.
18 MHz
Outputs
I and Q baseband signals, output voltage, EMF,
peak value
Power ramp
Output voltage
Output impedance
DATA, BIT CLOCK, SYMBOL CLOCK, PAR DATA, (all TTL levels)
0 V to 1 V
10
Ω
Level attenuation
via LEV ATT input
Range
Additional level error caused by attenuation
3 )
0 dB to 70 dB
<1 dB (up to 35 dB), <1.5 dB (up to 70 dB)
Envelope control
Modes
Analog External via POWER RAMP input (for data see vector modulation
above). With an internal power ramp, the connector serves as an output.
Digital Internal or external via BURST GATE input/output (PAR DATA connec-
tor). The BURST GATE input triggers a power ramp (TTL levels). The
low/high transition starts the ramp function from blanking level to max-
imum level, the high/low transition from maximum level to blanking
level. With an internal power ramp, the connector serves as an output.
Operating range 1 kHz to 2.5 MHz
Rise/fall time
Setting range
Resolution
Minimum time 0.25 symbols to 32 symbols
1/4 symbol
1 µs
Modulation modes ASK, FSK, GMSK, PSK, QAM
I 2 Q 2 + 1V =