AD8352(Rev0) データシートの表示（PDF） - Analog Devices
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AD8352 Datasheet PDF : 20 Pages
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AD8352
–60
–70
3RDS, 2V p-p OUT
–80
–90
–100
3RDS, 1V p-p OUT
–110
10
70
140
190
240
FREQUENCY (MHz)
Figure 27. Single-Ended, Third-Order Harmonic Distortion, 200 Ω Load
–60
Table 9. Distortion Cancellation Selection Components
(RD and CD) for Required Gain, 1 kΩ Load
AV (dB) RG (Ω)
CD (pF)
RD (kΩ)
6
3k
0 (DNP)
4.3
9
470
0 (DNP)
4.3
12
210
0.2
4.3
15
120
0.3
4.3
18
68
0.5
4.3
NARROW-BAND, THIRD-ORDER
INTERMODULATION CANCELLATION
Broadband, single tone, third-order harmonic optimization
does not necessarily result in optimum (minimum) two tone,
third-order intermodulation levels. The specified values for CD
and RD in Table 6 and Table 7 were determined for minimizing
broadband single tone, third-order levels.
–70
–80
–90
–100
2NDS, 2V p-p OUT
2NDS, 1V p-p OUT
Due to phase-related distortion coefficients, optimizing single
tone, third-order distortion does not result in optimum in band
(2f1 − f2 and 2f2 − f1), third-order distortion levels. By proper
selection of CD (using a fixed 4.3 kΩ RD), IP3s of better than
45 dBm are achieved. This results in degraded out-of-band,
third-order frequencies (f2 + 2f1, f1 + 2f2, 3f1 and 3f2). Thus,
careful frequency planning is required to determine the
tradeoffs.
–110
10
70
140
190
240
FREQUENCY (MHz)
Figure 28. Single-Ended, Second-Order Harmonic Distortion, 1 kΩ Load
–60
–70
–80
3RDS, 2V p-p OUT
Figure 30 shows narrow band (2 MHz spacing) OIP3 levels
optimized at 32 MHz, 70 MHz, 100 MHz, and 180 MHz using
the CD values specified in Figure 31. These four data points (the
CD value and associated IP3 levels) are extrapolated to provide
close estimates of IP3 levels for any specific frequency between
30 MHz and 180 MHz. For frequencies below approximately
140 MHz, narrow-band tuning of IP3 results in relatively higher
IP3s (vs. the broadband results shown in Table 2 specifications).
Though not shown, frequencies below 30 MHz also result in
improved IP3s when using proper values for CD.
–90
–100
3RDS, 1V p-p OUT
48
RL = 200Ω
47
RD = 4.3kΩ
CD = 0.3pF
46
45
–110
10
70
140
190
240
FREQUENCY (MHz)
Figure 29. Single-Ended, Third-Order Harmonic Distortion, 1 kΩ Load
Table 8. Distortion Cancellation Selection Components
(RD and CD) for Required Gain, 200 Ω Load
AV (dB)
RG (Ω)
CD (pF)
RD (kΩ)
3
4.3 k
0 (DNP)
4.3
6
540
0 (DNP)
4.3
9
220
0.1
4.3
12
120
0.3
4.3
15
68
0.6
4.3
18
43
0.9
4.3
44
43
AV =
6db
10db
15db
42
18dB
41
40
39
38
0
50
100
150
200
FREQUENCY (MHz)
Figure 30. Third-Order Intermodulation Distortion vs. Frequency for
Various Gain Settings
Rev. 0 | Page 13 of 20
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