SMU_dat-sw-en.pdf - 第21页

Version 08.00, Januar y 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 a…

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.

Version 08.00, January 2012

22 Rohde & Schwarz

R&S

SMU200A Vector Signal Generator

resolution 18 bit

logic format two’s complement

physical signal level

setting range 0 to –60 dBFS

resolution 0.01 dBFS

bandwidth

sample rate = 100 MHz

(no interpolation, user-defined)

40 MHz

I/Q data

sample rate < 100 MHz (interpolation) 0.31 × sample rate

markers 4 Control signals

data valid valid samples marked in data stream

Baseband input (analog/digital) (R&S

SMU-B17 option)

At least one R&S

SMU-B13 baseband main module and at least one R&S

SMU-B9/-B10/-B11 I/Q baseband generator must be

installed. The R&S

SMU-B17 option makes it possible to feed external analog or digital signals to the baseband section of the

R&S

SMU200A. The frequency of the signals can be shifted, and the signals can be added to the internally generated signal with

settable level ratio. If the R&S

SMU200A is equipped with a fading simulator, the input signals can also be faded.

Mode see also simultaneous modulation analog input,

digital input

peak level

setting range –10 dB to 0 dB referenced to full scale

resolution 0.01 dB

crest factor

setting range 0 dB to 30 dB

resolution 0.01 dB

Input level

The adjust level function automatically determines the peak level and crest factor of the

input signal.

The frequency offset can be used to shift the center frequency of the input signal in the

baseband. The restrictions caused by the modulation bandwidth apply.

setting range −40 MHz to +40 MHz

resolution 0.01 Hz

Frequency offset

frequency accuracy < 5 × 10

− 10 × frequency offset +

reference frequency error

I/Q swap I and Q signals swapped on/off

Analog I/Q inputs

All specifications apply to a peak level of 0 dB.

input impedance 50 

VSWR up to 30 MHz < 1.1, 1.03 (typ.)

I/Q inputs

input voltage for full-scale input

+= 0.5 V

carrier leakage I, Q

setting range −10 % to +10 %

resolution 0.01 %

I ≠ Q (imbalance)

setting range −3 dB to +3 dB

resolution 0.001 dB

I/Q skew

setting range –1 ns to +1 ns

I/Q impairment

resolution 1 ps

sample rate 100 MHz A/D converter

resolution 14 bit

with amplitude and group delay correction

bandwidth, roll-off to –0.1 dB 30 MHz

Aliasing filter

stopband rejection, f  70 MHz 80 dB (typ.)

I/Q wideband: on, optimize internal I/Q impairments for RF output: on

up to 10 MHz 0.2 dB (typ.)

RF frequency response for entire

instrument in modulation bandwidth

up to 30 MHz 0.4 dB (typ.)