SMU_dat-sw-en.pdf - 第20页

Version 08.00, Januar y 2012 20 Rohde & Schwarz R&S ® SMU200A Vector Signal Generator Measured frequency response of I/Q outputs. Measured SFDR of I/Q outputs.

Version 08.00, January 2012

Rohde & Schwarz R&S

SMU200A Vector Signal Generator 19

Internal baseband I/Q (with R&S

SMU-B13 option)

The R&S

SMU-B13 option converts the internal digital baseband signals of the R&S

SMU-B9/-B10/-B11 into analog signals for driving

the I/Q modulator. It also generates the analog I/Q output signals. One or two R&S

SMU-B13 can be installed.

The first R&S

SMU-B13 drives RF path A, the second RF path B. The I/Q output signals are available either for path A or B.

data rate 100 MHz

resolution 16 bit

D/A converter

sample rate 400 MHz (internal interpolation × 4)

with amplitude, group delay and S

correction

bandwidth, roll-off to −0.1 dB 40 MHz

D/A converter interpolation spectra

up to 10 MHz < −80 dBc

Aliasing filter

up to 40 MHz <

−73 dBc

carrier leakage

setting range −10 % to +10 %

resolution 0.01 %

I ≠ Q (imbalance)

setting range −1 dB to +1 dB

resolution 0.001 dB

quadrature offset

setting range −10° to +10°

I/Q impairment

resolution 0.01°

f > 100 MHz, –20 dBm  level  10 dBm, I/Q wideband: on, optimize internal I/Q

impairments for RF output: on, optimization mode: high quality

up to 10 MHz < 0.5 dB, 0.1 dB (typ.)

RF frequency response for entire

instrument in modulation bandwidth

up to 40 MHz < 2.0 dB, 0.3 dB (typ.)

up to 10 MHz > 50 dB, 56 dB (typ.) Suppression of image sideband for entire

instrument in modulation bandwidth

up to 40 MHz > 40 dB, 50 dB (typ.)

Carrier leakage

referenced to full-scale input < −55 dBc, < −65 dBc (typ.)

Additional level uncertainty referenced to

measured at 0 dBm with 16QAM, root

cosine filter,

α = 0.5, 10 kHz symbol rate

< 0.2 dB

I/Q outputs

Output impedance 50 

Output voltage EMF (output voltage depends on set

modulation signal)

1 V (V

)

Offset EMF < 1 mV

at R

= 50 

magnitude

up to 10 MHz 0.02 dB (typ.)

up to 40 MHz 0.03 dB (typ.)

nonlinear phase

up to 10 MHz 0.1° (typ.)

Frequency response

up to 30 MHz 0.2° (typ.)

at R

= 50 

magnitude

up to 10 MHz 0.01 dB (typ.)

up to 40 MHz 0.02 dB (typ.)

nonlinear phase

up to 10 MHz 0.1° (typ.)

I/Q balance

up to 30 MHz 0.2° (typ.)

at R

= 50 

SFDR (sine)

up to 2 MHz > 70 dB

up to 20 MHz 60 dB (typ.)

phase noise

10 MHz sine wave at 20 kHz offset −150 dBc (typ.)

wideband noise

Spectral purity

10 MHz sine wave at 1 MHz offset

−155 dBc (typ.)

Optimize internal I/Q impairments for RF output switched off.

Version 08.00, January 2012

20 Rohde & Schwarz

R&S

SMU200A Vector Signal Generator

Measured frequency response of I/Q outputs.

Measured SFDR of I/Q outputs.

Version 08.00, January 2012

Rohde & Schwarz R&S

SMU200A Vector Signal Generator 21

Differential I/Q output (R&S

SMU-B16 option)

One R&S

SMU-B16 option can be installed; the I/Q output signals are available either for path A or B.

This option is not compatible with rear-panel outputs (R&S

SMU-B81 and R&S

SMU-B82 options).

Additional specifications for I/Q outputs with R&S

SMU-B16 option

Output impedance

Single-ended 50 

Differential 100 

Output voltage output voltage depends on set modulation signal

Single-ended EMF 0.02 V to 2 V (V

)

Resolution 1 mV

Differential EMF 0.04 V to 4 V (V

)

Resolution 2 mV

Bias voltage (single-ended and differential) EMF –3.6 V to +3.6 V

Resolution 2 mV

Uncertainty 1 % + 4 mV

Offset voltage

Differential EMF –300 mV to +300 mV

Resolution 0.2 mV

Uncertainty 1 % + 0.1 % × bias voltage + 1 mV

at R

= 50 , output voltage > 0.5 V (V

)

magnitude

up to 10 MHz < 0.2 dB, 0.05 dB (typ.)

Differential signal balance

up to 40 MHz 0.2 dB (typ.)

at R

= 50 , output voltage > 0.5 V

)

magnitude

up to 10 MHz 0.02 dB (typ.)

up to 40 MHz 0.03 dB (typ.)

nonlinear phase

up to 10 MHz 0.1° (typ.)

Frequency response

up to 30 MHz 0.2° (typ.)

Digital baseband output (R&S

SMU-B18 option)

The R&S

SMU-B18 option makes digital I/Q signals available on the rear panel of the instrument. The digital I/Q output can be used

for the lossless connection of the R&S

SMU200A to the digital I/Q input of other Rohde & Schwarz instruments (e.g. R&S

AMU200A

baseband signal generator and fading simulator). One R&S

SMU-B18 can be installed.

standard

in line with Rohde & Schwarz TVR290,

I/Q data and control signals, data and

interface clock

level LVDS

connector 26-pin MDR

Interface

data rate 30 MHz to 100 MHz with 1 MHz resolution,

81.6 MHz

With source ‘user-defined’, the sample rate must be entered via the parameter ‘sample

rate’, no I/Q data clock being necessary. With source ‘digital I/Q out’ or ‘digital I/Q in’,

the sample rate will be estimated on the basis of the applied I/Q data clock.

source user-defined, digital I/Q out, digital I/Q in

sample rate 400 Hz to 100 MHz

max. sample rate limited by actual

interface data rate

resolution (user-defined) 0.001 Hz

I/Q sample rate

frequency uncertainty (user-defined) < 5 × 10

−

Optimize internal I/Q impairments for RF output switched off.