Introduction 1
Keysight M8195A Revision 2 – Arbitrary Waveform Generator User’s Guide 27
There are predefined sets of FIR filter coefficients which can be selected by the
user. When selecting the ‘user-defined’ filter type, all FIR filter coefficients are
fully controllable by the user.
There is a scaling multiplier at the output of the FIR filter which can be used to
digitally scale the output signal by factor between 0.0 and 1.0.
Extended
memory
DAC
FIR filter with 16taps
64
GSa/s
64
GSa/s
S
15
…
16 taps
Sample Rate
Divider = 1
= sample from memory
S
14
S
13
S
12
S
11
S
10
S
9
S
8
S
7
S
3
S
2
S
1
S
0
C
0
C
1
C
2
C
3
C
4
C
5
C
6
C
7
C
8
C
15
…
S
n
= user programmable coefficient
C
n
Extended
memory
DAC
FIR filter with 32 taps
64
GSa/s
32
GSa/s
0
…
Sample Rate
Divider = 2
S
15
0 S
14
0 S
13
0 S
12
0 0 S
1
0 S
0
C
0
C
1
C
2
C
3
C
4
C
5
C
6
C
7
C
8
C
28
C
29
C
30
C
31
…
Extended
memory
DAC
FIR filter with 64
taps
64
GSa/s
16
GSa/s
0
…
Sample Rate
Divider = 4
0 0 S
15
0 0 0 S
14
0 0 0 0 S
0
C
0
C
1
C
2
C
3
C
4
C
5
C
6
C
7
C
8
C
C
61
C
62
C
63
…
…
…
…
Shifted at a rate of 64
GSa
/s
Shifted at a rate of 64 GSa/s
Shifted at a rate of 64 GSa/s
C
14
C
13
C
12
60
FIR
Scale
FIR
Scale
FIR
Scale
Figure 4: M8195A FIR filter operation with different dividers. Note: Sample rates are shown as 64, 32 and 16 GSa/s in the diagram.
In fact, they are adjustable in the range: 53.76 … 65; 26.88 … 32.5 and 13.44 … 16.25 GSa/s
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