Agilent Technologies ESG Instrukcja Użytkownika Pobierz pdf (Strona 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

+ Q

= 0.5 V

rms

, nominal)

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

±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

+ Q

= 0.5

rms

)

I/Q modulation

(ESG-DP and ESG-D series only)

I/Q inputs

Input impedance 50 Ω

Full scale input

√ I

+ Q

= 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

(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

(rms) <0.75% <0.5% 0.75% <1%

Mag. error

(rms) <0.5% < 0.35% <0.5% <0.75%

Phase error

(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

≤–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 50Ω, nominal

Coherent carrier out

(ESG-DP and ESG-D series only)

Range 250 MHz to maximum carrier

frequency

Level 0 dBm ±5 dB, typical

Impedance 50Ω

Specifications for digital models only

1. The optimum I/Q input level is √I

= 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.

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