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3.2 Anti-alias fi lters and alias exposure-free mode
The broadband VSA can be confi gured to be essentially alias-free by using the full
rate sampling mode and installing an external lowpass fi lter on the digitizer input.
Use BNC-f to SMA-m and SMA-f to BNC-m adapters to connect the fi lter’s SMA
connectors to the digitizer in case the digitizer has BNC connectors.
Table 3. External lowpass fi lters
1. Mini-Circuits, Inc., 1-800-854-7949, www.minicircuits.com.
2. For the HF input a 300 MHz lowpass fi lter will avoid aliasing from signals above 300 MHz, but in-band
and out-of-band aliasing is still possible since full rate mode is not supported with the HF input.
Digitizer model Cutoff frequency Filter part number
U1066A-002 (DC438) 90 MHz Mini-circuits BLP/SLP-90
U1066A-001 (DC440) 100 MHz
2
Mini-circuits
1
BLP/SLP-100
U1065A (DC252 (2 ch),
DC282 (2 ch))
1650 MHz Mini-circuits
1
SLP-1650
U1065A (DC222, DC252
(1 ch), DC282 (1ch))
2000 MHz Mini-circuits
1
SLP-2000
7