
AD8138
Rev. F | Page 11 of 24
DI
S
T
O
R
T
IO
N
(
d
Bc)
–90
–100
–110
–70
–80
–60
VS =5V
VOUT, dm =2V p-p
HD2 (F = 20MHz)
HD3 (F = 20MHz)
HD2 (F = 5MHz)
HD3 (F = 5MHz)
RLOAD ()
200
600
1000
1400
1800
0
107
3-
01
7
Figure 17. Harmonic Distortion vs. RLOAD
–90
–100
–110
–70
–80
–60
–120
200
600
1000
1400
1800
RLOAD ()
D
IS
T
OR
T
ION
(dB
c)
HD3 (F = 5MHz)
HD2 (F = 5MHz)
HD3 (F = 20MHz)
HD2 (F = 20MHz)
VS =±5V
VOUT, dm =2V p-p
01
07
3-
0
18
Figure 18. Harmonic Distortion vs. RLOAD
FREQUENCY (MHz)
–50
–90
–110
–70
–30
–10
10
49.5
49.7
49.9
50.1
50.3
50.5
FC =50MHz
VS =±5V
P
OU
T
(dB
m
)
0
1
073
-01
9
Figure 19. Intermodulation Distortion
FREQUENCY (MHz)
IN
T
E
RCE
P
T
(
d
Bm)
30
25
35
40
45
RL =800
VS =+5V
VS =±5V
020
40
60
010
73
-02
0
80
Figure 20. Third-Order Intercept vs. Frequency
VS =±5V
VOUT, dm
VOUT+
VOUT–
V+DIN
5ns
1V
01
07
3-
02
1
Figure 21. Large Signal Transient Response
VOUT, dm =0.2Vp-p
VS =±5V
CF =0pF
CF =1pF
5ns
40mV
01
07
3-
02
2
Figure 22. Small Signal Transient Response