Rohde & Schwarz SMBV100B, User Manual

Page: 152 / 1030

Configuring the Internal Baseband Source
R&S
®
SMBV100B
150 User Manual 1178.4460.02 ─ 03
Example: Calculating the maximum waveform length
The calculation in this example assumes R&S SMBV100B equipped with option
R&S SMBVB-K511 (256 Msamples).
●
Total Memory Size = 256 MB
●
Required Memory Size (per complex sample) = 32 bits + 3 bits = 35 bits = 4.375
bytes, where:
–
The raw I/Q samples are stored as 16-bit values;
That is, for I/Q data = 2 x 16 bits = 32 bits (16 bits per I/Q channel)
– Each software defined marker requires 1 bit;
That is, for 3 enabled markers = 3 x 1 bit = 3 bits
●
Maximum Waveform Length (with 3 markers) = 256 MB / 4.375 bytes = 58 Msam-
ples
●
Theoretical Maximum Waveform Length (no markers) = 256 MB / 4 bytes
= 64
Msamples
Hence, a memory size of 256 MB yields a maximum waveform length of 58 Msamples
if three markers are enabled. The maximum waveform length increases to 64 Msam-
ples, if the internal hardware markers are used, and the complete memory is available
for I/Q data.
The minimum length of a waveform is 512 samples. A waveform shorter than this value
is automatically repeated until it reaches the minimum length.
3.6.3 ARB Settings
Access:
► Select "Baseband > ARB".
The "ARB" dialog enables direct selection of the waveform file to be processed, the
selection of a test signal or access to the multi-segment and multi-carrier settings.
The remote commands required to define these settings are described in Chap-
ter 12.16.4.3, "SOURce:BB:ARBitrary Subsystem" , on page 737.
Settings:
● ARB General Settings ...........................................................................................151
● Sine Test Signals ...................................................................................................155
● Rectangular Test Signal ........................................................................................ 156
● Constant IQ Test Signal ........................................................................................ 158
● Trigger, Marker and Clock Setting .........................................................................159
Using the Arbitrary Waveform Generator (ARB)