SMIQ Modulation - General
1125.5555.03 E-82.55
2.6 Modulation - General
The SMIQ offers the following modulations and digital standards:
• Analog modulations
- Amplitude modulation (AM)
- Broadband AM (BB-AM)
- Frequency modulation (FM; with option SM-B5 only)
- Phase modulation (PM; with option SM-B5 only)
- Pulse modulation (PULSE)
• Vector modulation (VECTOR MOD)
• Digital modulation (DIGITAL MOD; option SMIQB20)
• Digital standards (DIGITAL STD;-PHS; IS95/CDMA - option SMIQB42; NADC; PDC; GSM;
DECT; W-CDMA - option SMIQB43; 3GPP W-CDMA - option SMIQB45;
Enhanced Channels – option SMIQB48; options SMIQB20 and SMIQB11)
For AM, FM, PM and digital modulation internal or external modulation sources can be used.
For BB-AM, pulse and vector modulation only external modulation sources can be used.
2.6.1 Modulation Sources
Internal Modulation Sources
The internal modulation generator LF GEN is available for AM, FM and PM. The generator supplies
sinusoidal signals in the frequency range from 0.1 Hz to 1 MHz. For a more detailed description, cf.
Section "LF Generator".
The internal modulation coder (option SMIQB20) supplies PRBS signals, clock signals or modulation
data for the digital modulations. The data generator (option SMIQB11) supplies modulation data and
control signals. For a more detailed description, cf. Section "Digital Modulations".
External Modulation Sources
The appropriate input sockets to the different modulations in the case of external supply can be taken
from Table 2-1.
Table 2-1 Input sockets for the different types of modulation
Input
Modulation EXT1 EXT2 PULS I Q DATA PAR DATA BIT CLOCK SYMBOL
CLOCK
POW RAMP
AM
X
BB-AM
X
FM1
XX
FM2
XX
PM1
XX
PM2
XX
PULSE
X
VECTOR MOD
XX X
DIGITAL MOD
XXXXX
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