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AD9467 Arkusz danych(PDF) 4 Page - Analog Devices

Numer części AD9467
Szczegółowy opis  Resonant Approach to Designing a Band-Pass Filter for Narrow-Band, High IF, 16-Bit, 250 MSPS Receiver Front End
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AD9467 Arkusz danych(HTML) 4 Page - Analog Devices

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CN-0268
Circuit Note
Rev. 0 | Page 4 of 6
Figure 6 and Figure 7 shows the resulting antialiasing filter
response with a 1 dB bandwidth of 41 MHz and a 3 dB bandwidth
of 89 MHz, centered at an IF of 203 MHz. Figure 8 shows the FFT
spectrum for the final receiver circuit of Figure 1, where the SNR is
72.5 dBFS, and the SFDR performance approaches 90 dBc.
0
100
200
FREQUENCY (MHz)
300
400
–14.286
–8.571
–2.857
2.857
8.571
14.286
–20.000
20.000
Figure 6. Antialiasing Filter Response, fC = 203 MHz
–3.5
–3.0
–2.5
–2.0
–1.5
–1.0
–0.5
0
120
140
160
180
200
220
240
FREQUENCY (MHz)
1dB BW = 41MHz
3dB BW = 89MHz
Figure 7. Antialiasing Filter Response, fC = 203 MHz, 1 dB and 3 dB Bandwidth
–130
–120
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
0
20
40
60
80
100
120
FREQUENCY (MHz)
fIN = 203MHz
fS = 245.76MHz
SNR = 72.5dB
SFDR = –88.9dBc
H2/H3 = –89.1dBc/–88.9dBc
Figure 8. Single Tone FFT Plot, Input = 203 MHz,
Sampling Rate = 245.76 MSPS
Using ADS as a simulation tool, the filter components can
be further tuned to shift the resonant peak to the desired IF.
For example, by changing the parallel 8.2 pF capacitor of the
antialiasing filter to 10 pF shifts the resonance peak lower to
180 MHz. Figure 9 through Figure 11 show the filter profile
and single-tone FFT performance for this condition.
0
100
200
FREQUENCY (MHz)
300
400
–14.286
–8.571
–2.857
2.857
8.571
14.286
–20.000
20.000
Figure 9. Antialiasing Filter Response, fC = 183 MHz
–3.5
–3.0
–2.5
–2.0
–1.5
–1.0
–0.5
0
100
120
140
160
180
200
220
240
FREQUENCY (MHz)
1dB BW = 40MHz
3dB BW = 75MHz
Figure 10. Antialiasing Filter Response, fC = 183 MHz,
1 dB and 3 dB Bandwidth
–130
–120
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
0
20
40
60
80
100
120
FREQUENCY (MHz)
fIN = 183MHz
fS = 245.76MHz
SNR = 73dB
SFDR = –91dBc
H2/H3 = –94dBc/–91dBc
Figure 11. Single Tone FFT Plot, Input = 183 MHz,
Sampling Rate = 245.76 MSPS


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