Atec Agilent-E4421B-24B-32B-33B-35B-36B - Manual (Page 10)

10
Level accuracy with digital modulation
(ESG-DP and ESG-D series only)
With ALC On; relative to CW; with PRBS modulated data;
if using I/Q inputs,
√
I 2 + Q 2 = 0.5 V
rms
, nominal) 1
π/4 DQPSK or QPSK formats
ESG-D series ESG-DP series
±0.15 dB ±0.20 dB
(Relative to CW; with raised cosine or root-raised cosine filter and
α ≥0.35; with 10 kHz ≤ symbol rate ≤1 MHz; at RF freq ≥25 MHz;
power
≤ max specified –3 dB or –6 dB with Option UNB)
Constant amplitude formats (FSK, GMSK, etc)
ESG-D series ESG-DP series
No degradation ±0.10 dB
Level accuracy with ALC off
2
±0.3 dB, typical
(After power search is executed; relative to CW level accuracy with
ALC on; with burst off; if external I/Q is enabled
√
I 2 + Q 2 = 0.5 V
rms
)
I/Q modulation
(ESG-DP and ESG-D series only)
I/Q inputs
Input impedance
50
Ω
Full scale input 1 √
I 2 + Q 2 = 0.5 V
rms
Typical I/Q frequency response
Adjustments/Impairments (nominal)
DC offset (I and Q independently adjustable) ±100%
I/Q gain ratio
±4 dB
I/Q quadrature ±10° (for fc ≤ 3.3 GHz)
DC vector accuracy 3
(Relative to full scale, power ≤ +7 dBm (≤+10 dBm, Option UNB))
Frequency (GHz) <0.6 0.6 to 2 2 to 3.7 ≤ 4
Static EVM 4 (rms) <0.75% <0.5% 0.75% <1%
Mag. error 4 (rms) <0.5% <0.35% <0.5% <0.75%
Phase error 4 (rms) <0.35° <0.25° <0.35° <0.5°
Origin offset (dBc) <–46 <–46 <–40 <–40
External burst envelope
(ESG-DP and ESG-D series only)
Input voltage
RF On
0 V
RF Off –1.0 V
Linear control range 0 to –1 V
On/off ratio
≤3 GHz >75 dB
>3 GHz >60 dB
V
in
≤–1.05 V
Rise/fall time <2 µs with rectangular input, typical
Minimum burst repetition frequency
ALC on
10 Hz, typical
ALC off dc
External input Ext 1
Input impedance 50
Ω, nominal
Coherent carrier out 5
(ESG-DP and ESG-D series only)
Range 250 MHz to maximum carrier
frequency
Level 0 dBm ±5 dB, typical
Impedance 50 Ω
Specifications for digital models only
1. The optimum I/Q input level is
√
I2+Q2 = 0.5 V
rms
, I/Q drive level affects EVM, origin offset, spectral regrowth, and noise floor. Typically, level accuracy with ALC on
will be maintained with drive levels between 0.25 and 1.0 V
rms
.
2. When applying external I/Q signals with ALC off, output level will vary directly with I/Q input level. Power search is an internal calibration routine used to set output
power when ALC is off. The routine disables all modulation inputs, adjusts output power while applying 0.5 V
rms
to the I/Q modulathen enables modulation.
3. Valid for 10 days after executing internal calibration routine, provided temperature is maintained within ±5 ˚C of calibration temperature.
4. Measured at full scale with origin offset removed.
5. Coherent carrier is modulated by FM or
ΦM when enabled.