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參數(shù)資料
| 型號： | ADA4862-3 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | High Speed, G = +2, Low Cost, Triple Op Amp |
| 中文描述： | 高速，G \u003d 2時，低成本，三重運算放大器 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 262K |
| 代理商： | ADA4862-3 |
ADA4862-3
Option 2
Another option exists for running the ADA4862-3 as a unity-
gain amplifier. In this configuration, the noise gain is 2, see
Figure 34. The frequency response and transient response for
this configuration closely match the gain of +2 plots because the
noise gains are equal. This method does have twice the noise
gain of Option 1; however, in applications that do not require
low noise, Option 2 offers less peaking and ringing. By tying the
inputs together, the net gain of the amplifier becomes 1.
Equation 1 shows the transfer characteristic for the schematic
shown in Figure 34. Frequency and transient response are
shown in Figure 35 and Figure 36.
Rev. A | Page 12 of 16
+
+
=
G
G
F
i
G
F
i
O
R
R
R
V
R
R
V
V
(1)
which simplifies to
V
O
=
V
i
.
0.01
μ
F
0.01
μ
F
V
IN
R
T
V
OUT
+V
S
–V
S
GAIN OF +1
0
10
μ
F
10
μ
F
R
F
R
G
Figure 34. Unity Gain of Option 2
1
–7
0.1
1000
FREQUENCY (MHz)
G
1
10
100
0
–1
–2
–3
–4
–5
–6
G = +1
R
L
= 150
Ω
0
Figure 35. Frequency Response of Option 2
0
G = +1
V
S
=
±
5V
R
= 150
Ω
TIME = 2ns/DIV
200
O
150
100
50
0
–50
–100
–150
–200
Figure 36. Small Signals Transient Response of Option 2
0.01
μ
F
0.01
μ
F
V
IN
R
T
V
OUT
+V
S
–V
S
GAIN OF –1
0
10
μ
F
10
μ
F
Figure 37. Inverting Configuration (G = 1)
2.0
–2.0
O
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
C
L
= 9pF
C
L
= 6pF
C
L
= 4pF
G = –1
R
L
= 150
Ω
V
OUT
= 2V p-p
V
±
5V
TIME = 5ns/DIV
0
Figure 38. Large Signal Transient Response for Various Capacitor Loads
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