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308 Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide
Creating and Downloading User-Data Files
User File Data (Bit/Binary) Downloads (E4438C and E8267D)
continuous data stream. This means that it does not apply to a downloaded PRAM file type (covered
later in this chapter).
In parallel mode, for a 256QAM modulation scheme, Custom has the capability to reach a data rate
of up to 400 Mbps. The FIR filter width is what determines the data rate. The following table shows
the maximum data rate for each modulation type. Because the signal generator’s maximum symbol
rate is 50 Msps, a modulation scheme that has only 1 bit per symbol is always processed in serial
mode.
The only external effect of the parallel mode is in the EVENT 1 output signal. In serial and parallel
mode, the signal generator outputs a narrow pulse at the EVENT 1 connector. But in parallel mode,
the output pulse width increases by a factor of bits-per-symbol wide, as shown in the following
figure.
Modulation Type Bit Rate Range for Internal Data (bit rate = symbol rate × bits per symbol)
16 Symbol Wide FIR
Filter
32 Symbol Wide FIR
Filter
64 Symbol Wide FIR
Filter
BPSK, 2FSK, MSK 1bps–50Mbps 1bps–25 Mbps 1bps–12.5Mbps
C4FM, OQPSK,
4FSK
2bps–100Mbps 2bps–50Mbps 2bps–25Mbps
IS95 OQPSK,
QPSK
P4DQPSK,
IS95 QPSK
GRAYQPSK,
4QAM
D8PSK, EDGE,
8FSK, 8PSK
3bps–150Mbps 3bps–75Mbps 3bps–37.5Mbps
16FSK, 16PSK,
16QAM
4bps–200Mbps 4bps–100Mbps 4bps–50Mbps
Q32AM 5bps–250Mbps 5bps–125Mbps 5bps–62.5Mbps
64QAM 6bps–300Mbps 6bps–150Mbps 6bps–75Mbps
128QAM 7bps–350Mbps 7bps–175Mbps 7bps–87.5Mbps
256QAM 8bps–400Mbps 8bps–200Mbps 8bps–100Mbps