Datasheet

Data Sheet ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4
Rev. E | Page 9 of 24
1
0
–1
–2
–3
–4
–5
–6
–7
–8
–9
–10
0.1 1 10 100 1k
FREQUENCY (MHz)
NORMALIZED CLOSED-LOOP GAIN (dB)
08054-037
V
S
= 3V
R
F
= 604Ω
R
L
= 150Ω
G = –1
V
OUT
= 2V p-p
G = +2
V
OUT
= 2V p-p
G = +1
V
OUT
= 1V p-p
G = +5
V
OUT
= 2V p-p
Figure 19. Large-Signal Frequency Response vs. Gain, V
S
= 3 V,
ADA4891-1/ADA4891-2
–120
–110
–100
–90
–80
–70
–60
–50
–
40
0.1 1 10
DISTORTION (dBc)
FREQUENCY (MHz)
V
S
= 5V
R
L
= 1kΩ
V
OUT
= 2V p-p
G = +2
SECOND HARMONIC
G = +1
SECOND HARMONIC
G = +1
THIRD HARMONIC
G = +2
THIRD HARMONIC
08054-038
Figure 20. Harmonic Distortion (HD2, HD3) vs. Frequency, V
S
= 5 V
–120
–110
–100
–90
–80
–70
–60
–50
–
40
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
DISTORTION (dBc)
OUTPUT VOLTAGE (V p-p)
G = +1
THIRD HARMONIC
V
S
= 5V
R
F
= 604Ω
R
L
= 1kΩ
f
C
= 1MHz
G = –1
THIRD HARMONIC
G = –1
SECOND HARMONIC
G = +1
SECOND HARMONIC
0
8054-040
Figure 21. Harmonic Distortion (HD2, HD3) vs. Output Voltage, V
S
= 5 V
1
0
–1
–2
–3
–4
–5
–6
–7
–8
–9
–10
0.1 1 10 100 1k
FREQUENCY (MHz)
NORMALIZED CLOSED-LOOP GAIN (dB)
08054-082
V
S
= 3V
R
F
= 453Ω
R
L
= 150Ω
G = +2
V
OUT
= 2V p-p
G = –1
V
OUT
= 2V p-p
G = +5
V
OUT
= 2V p-p
G = +1
V
OUT
= 1V p-p
Figure 22. Large-Signal Frequency Response vs. Gain, V
S
= 3 V,
ADA4891-3/ADA4891-4
–90
–80
–70
–60
–50
–40
–
30
0.1 1 10
DISTORTION (dBc)
FREQUENCY (MHz)
G = +1
SECOND HARMONIC
G = +1
THIRD HARMONIC
G = +2
SECOND HARMONIC
V
S
= 3V
R
L
= 1kΩ
V
OUT
= 2V p-p
OUT
IN
+V
S
= +1.9V
–V
S
= –1.1V
G = +1 CONFIGURATION
1kΩ
50Ω
G = +2
THIRD HARMONIC
08054-039
Figure 23. Harmonic Distortion (HD2, HD3) vs. Frequency, V
S
= 3 V
–120
–110
–100
–90
–80
–70
–60
–50
–
40
0
0.51.01.52.02.53.0
DISTORTION (dBc)
OUTPUT VOLTAGE (V p-p)
V
S
= 3V
f
C
= 1MHz
G = –1
SECOND HARMONIC
G = –1
THIRD HARMONIC
G = +1
THIRD HARMONIC
G = +1
SECOND HARMONIC
08054-041
OUT
IN
+V
S
= +1.9V
–V
S
= –1.1V
1kΩ
50Ω
G = +1
CONFIGURATION
Figure 24. Harmonic Distortion (HD2, HD3) vs. Output Voltage, V
S
= 3 V