GENERAL INFORMATION
1-17
INTERNAL DUAL-CHANNEL ARB
SOURCE (OPTION 005)
A high performance dual Arbitrary Waveform Generator (ARB) provides IQ signals for
the IQ modulator.
The ARB enables files to be downloaded with sample rates from 17 kHz to 66 MHz. The
ARB uses an interpolation system to increase the digital to analog converter sample rate
and avoid the use of reconstruction filters.
Typical 3GPP test model 1 (64 channels)
Flash memory size: 23
592 960 sample pairs
Maximum number of files: 180
Sample format: 32 bits of data — 14 bits I, 14 bits Q, 3 associated marker bits
Sample rate tuning: ± 20 ppm, 0.1 ppm step resolution
D-A converter resolution: 14 bits
D-A sample rate: 44 to 66 Msamples/s
Interpolation factor: Automatically selected
Reconstruction filter stop band
attenuation:
> 70 dB
ARB spectral purity:
Spurious-free dynamic
range:
> 70 dBc, typically > 80 dBc
20 kHz offset phase noise:
< −120 dBc/Hz
Floor noise:
< −140 dBc/Hz
®
Windows based software package is provided for the creation, formatting and
downloading of ARB waveform files to the 3410 Series.
A waveform library is provided on a CD containing a selection of files for testing 2G,
2.5G and 3G systems. Files can be downloaded from www.aeroflex.com.
Marker control bits: Up to three marker bits (1–3) can be attached to each sample of IQ data. These can be
used to indicate significant points in the waveform and are available as HC CMOS
outputs via the rear-panel AUX IN/OUT connector. Marker bit 1 can be used as an RF
burst control signal. Marker bit 2 can be used as a burst attenuation trigger signal to
decrease (attenuate) the RF level from its nominal value.
Control mode: Continuous, single or triggered operation of the ARB.
An external trigger input signal is available on the AUX IN/OUT rear-panel connector.
IQ outputs (not applicable when
Option 009 is fitted):
The IQ signals produced by the ARB are available on the rear-panel I/AM OUT and
Q/FM OUT BNC connectors. Output level is 0.5 V RMS EMF (vector sum) from a source
impedance of 50 Ω.
FAST PULSE MODULATOR
(OPTION 006)
This option requires electronic attenuator (Option 003) to be fitted.
On/off ratio:
> 80 dB for carrier levels ≥ −60 dBm
Rise/fall time: < 20 ns typical (10 to 90%)
Pulse delay: Typically < 50 ns
To Next Page
