SMU_dat-sw-en.pdf - 第27页

Version 08.00, Januar y 2012 Rohde & Schwarz R&S ® SMU200A Vector Signal Generator 27 The frequency offset can be used to shift t he center frequency of the modulation signal in the baseband. The restrictions cau…

Version 08.00, January 2012

26 Rohde & Schwarz

R&S

SMU200A Vector Signal Generator

I/Q baseband generator (R&S

SMU-B9/-B10/-B11 option) – realtime operation

At least one R&S

SMU-B13 baseband main module must be installed. One or two R&S

SMU-B9/-B10/-B11 options can be installed.

Their I/Q signals can be assigned a frequency offset and/or be added in the digital domain with settable level ratio.

ASK

modulation index 0 % to 100 %

resolution 0.1 %

FSK 2FSK, 4FSK, MSK

deviation 0.1 to 1.5 × f

sym

maximum 10 MHz

resolution < 0.1 Hz

setting uncertainty < 0.5 %

variable FSK 4FSK, 8FSK, 16FSK

deviations –1.5 × f

sym

to +1.5 × f

sym

maximum 10 MHz

resolution < 0.1 Hz

PSK BPSK, QPSK, QPSK 45° offset, OQPSK,

π/4-QPSK, π/2-DBPSK, π/4-DQPSK,

π/8-D8PSK, 8PSK, 8PSK EDGE

Types of modulation

QAM 16QAM, 32QAM, 64QAM, 256QAM,

1024QAM

Coding Not all coding methods can be used with

every type of modulation.

off, differential, diff. phase,

diff. + Gray, Gray, GSM, NADC, PDC,

PHS, TETRA, APCO25 (PSK), PWT,

TFTS, INMARSAT, VDL, EDGE,

APCO25(FSK), ICO, CDMA2000

WCDMA

Any filter can be used with any type of modulation. The bandwidth of the modulation

signal is max. 25 MHz; the signal is clipped if the bandwidth is exceeded.

cosine, root cosine

filter parameter α 0.05 to 1.00

Gaussian

filter parameter B × T 0.15 to 2.50

cdmaOne, cdmaOne + equalizer

cdmaOne 705 kHz,

cdmaOne 705 kHz + equalizer

CDMA2000

APCO25 C4FM

rectangular

split phase

filter parameter B × T 0.15 to 2.5

Baseband filter

resolution of filter parameter 0.01

If an external clock is used, the applied data rate may deviate from the set clock rate by

±2 %. The external clock can be used for internal and external data.

operating mode internal, external

setting range

ASK, PSK, QAM 400 Hz to 25 MHz

FSK 400 Hz to 15 MHz

resolution 0.001 Hz

frequency uncertainty (internal)

< 5 × 10

–14

× symbol rate + reference

frequency uncertainty

external clock symbol, K × symbol, bit clock

clock divider K 1 to 64

Symbol rate

external clock rate max. 100 MHz

CDMA2000

is a registered trademark of the Telecommunications Industry Association (TIA - USA).

Version 08.00, January 2012

Rohde & Schwarz R&S

SMU200A Vector Signal Generator 27

The frequency offset can be used to shift the center frequency of the modulation 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 uncertainty < 5 × 10

− 10 × frequency offset +

reference frequency error

internal

All 0, All 1

PRBS

sequence length 9, 11, 15, 16, 20, 21, 23

pattern

length 1 bit to 64 bit

data lists

R&S

SMU-B9 output memory 8 bit to 4 Gbit

R&S

SMU-B10 output memory 8 bit to 2 Gbit

R&S

SMU-B11 output memory 8 bit to 512 Mbit

nonvolatile memory hard disk

external

In the case of serial transmission, the symbol strobe marks the LSB of the symbol, and

the maximum symbol rate is limited by the data rate of the interface.

serial

word width 1 bit to 10 bit

bit rate max. 60 MHz

parallel

word width 1 bit to 10 bit

Data sources

symbol rate max. 25 MHz

In internal clock mode, a trigger event restarts the clock generation. The clock phase is

then synchronous with the trigger (with a certain timing uncertainty).

In external clock mode, the trigger event is synchronized to the symbol clock.

operating mode internal, external

modes auto, retrig, armed auto, armed retrig

setting uncertainty for clock phase related

to trigger in internal clock mode

< 18 ns

external trigger delay

setting range 0 sample to (2

– 1) sample

resolution

internal clock mode 0.01 sample

external clock mode 1 sample

setting uncertainty < 5 ns

external trigger inhibit

setting range 0 sample to (2

– 1) sample

resolution 1 sample

external trigger pulse width > 15 ns

Triggering

external trigger frequency < 0.02 × sample rate

Version 08.00, January 2012

28 Rohde & Schwarz

R&S

SMU200A Vector Signal Generator

number 4

level LVTTL

operating modes control list, restart, pulse, pattern, ratio

marker delay (in sample)

setting range 0 to 2

– 1

setting range without recalculation 0 to 2000

resolution of setting 0.001

Marker outputs

setting uncertainty < 10 ns

Internal or external via LEVATT input. The signal switches between nominal and

reduced level (without edge shaping). If an internal LEVATT signal is used, the

connector is used as an output.

setting range 0 dB to 60 dB

additional level error in case of reduction

up to 30 dB < 1 dB

Level reduction

up to 50 dB < 3 dB

Internal or external via BURST input. The signal triggers the beginning of a power

ramp. The positive edge starts power ramping from blank to full level, the negative edge

ramping in the opposite direction from full level to blanking. If an internal BURST GATE

signal is applied, the connector is used as an output.

operating range max. 5 MHz

rise/fall time

setting range 0.5 symbol to 16 symbol

resolution 0.1 symbol

Burst

ramp shape cosine, linear

The input impedance and trigger threshold can be set separately for the trigger and the

clock/data inputs.

input impedance 1 k, 50 

trigger threshold

setting range 0.00 V to 2.50 V

Trigger/clock/data inputs

resolution 0.01 V

Clock/data outputs level LVTTL