Atec Agilent-E4438C - Manual (Page 20)

20
Basic modulation types [custom format]
PSK BPSK, QPSK, OQPSK, π/4DQPSK, 8PSK, 16PSK, D8PSK
MSK User-defined phase offset from 0 to 100°
ASK User-defined depth from 0.001 to 100%
QAM 4, 16, 32, 64, 128, 256
FSK Selectable: 2, 4, 8, 16 level symmetric, C4FM
User defined: Custom map of up to 16 deviation levels
Symbol rate Maximum deviation
< 5 MHz 4 times symbol rate
> 5 MHz, < 50 MHz 20 MHz
Resolution: 0.1 Hz
I/Q Custom map of 256 unique values
FIR filter
Selectable Nyquist, root Nyquist, Gaussian, rectangular, Apco 25
a: 0 to 1, BbT: 0.1 to 1
Custom FIR 16-bit resolution, up to 64 symbols long, automatically resampled to
1024 coefficients [max]
> 32 to 64 symbol filter: symbol rate
≤ 12.5 MHz
> 16 to 32 symbol filter: symbol rate
≤ 25 MHz
Internal filters switch to 16 tap when symbol rate is
between 25 and 50 MHz
Symbol rate
For external serial data, symbol rate is adjustable
from 1000 symbols/sec to a maximum symbol rate of
50 Mbits/sec
#bits/symbol
For internally generated data, symbol rate is adjustable from 1000 symbols/sec to
50 Msymbols/sec. and a maximum of 8 bits per symbol. Modulation quality may be
degraded at high symbol rates. See data types for memory requirements.
Baseband reference frequency
Data clock can be phase locked to an external reference.
13 MHz for GSM, 250 kHz to 100 MHz in W-CDMA and cdma2000
1, 2
Input ECL, CMOS, TTL compatible, 50 Ω AC coupled
Frame trigger delay control
Range 0 to 1,048,575 bits
Resolution 1 bit
Specifications for I/Q Characteristics
1. Performance below 1 MHz not specified.
2. When used, this baseband reference is independent of the 10 MHz RF reference.
Baseband generator
[real-time mode]
[Option 601 or 602]