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© National Instruments Corporation 29 NI 5441 Specifications
Onboard Signal Processing
Figure 7. Onboard Signal Processing Block Diagram
Specification Value Comments
IQ Rate
OSP
Interpolation
Range
12 to 512 (Multiples of 2)
512 to 1,024 (Multiples of 4)
1,024 to 2,048 (Multiples of 8)
(OSP Interpolation = FIR Interpolation × CIC Interpolation)
Total
NI PXI-5441
Interpolation =
OSP
Interpolation ×
DAC
Interpolation.
IQ Rate Sample Rate/OSP Interpolation
(Lower IQ Rates are possible by either lowering the sample rate
or doing software interpolation)
Example: For a
Sample Rate
of 100 MS/s,
IQ Rate Range
= 48.8 kS/s to
8.3 MS/s
Data
Processing
Modes
1. Real (I path only)
2. Complex (IQ)
—
Pre-Filter Gain and Offset
Pre-Filter Gain
and Offset
Resolution
18 Bits —
Pre-Filter Gain
Range
–2.0 to +2.0
(Values < |1| attenuate User Data)
Unitless
Pre-Filter
Gain Q
Pre-Filter
Offset Q
Q FIR
NCO
Pre-Filter
Gain I
Pre-Filter
Offset I
Digital
Gain
DAC
Interpolation
DAC
IQ
Rate
X
X
–
Output
Engine
Waveform
Memory
Iφ Qφ
Onboard Signal Processing
I FIR
Q CIC
I CIC
IQ Rate Rate Change
(OSP Interpolation)
Sample Rate Rate Change Effective
Sample Rate