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Figure 7.  Onboard Signal Processing Block Diagram

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 
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

I

φ

Q

φ

Onboard Signal Processing

I FIR

Q CIC

I CIC

IQ Rate

Rate Change

(OSP Interpolation)

Sample Rate

Rate Change

Effective

Sample Rate