© National Instruments Corporation 29 NI 5441 Specifications
Onboard Signal Processing
Figure 7. Onboard Signal Processing Block Diagram
Specification Valu e 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)
Tota l
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
IφQφ
Onboard Signal Processing
I FIR
Q CIC
I CIC
IQ Rate Rate Change
(OSP Interpolation)
Sample Rate Rate Change Effective
Sample Rate