參數(shù)資料
型號(hào): AD8067ART
廠商: Analog Devices, Inc.
英文描述: High Gain Bandwidth Product Precision Fast FET⑩ Op Amp
中文描述: 高增益帶寬積精密高速運(yùn)算放大器場(chǎng)效應(yīng)⑩
文件頁(yè)數(shù): 21/24頁(yè)
文件大小: 873K
代理商: AD8067ART
AD8067
Rev. 0 | Page 21 of 24
AD8067
0.1
μ
F
10
μ
F
+5V
49.9k
50
49.9k
0.33pF
V
OUT
0.1
μ
F
10
μ
F
–5V
EPM 605 LL
–5V
0.33pF
NOTES
I
D
@ –5V = 0.074nA
C
D
@ –5V = 0.690pF
R
B
@ 1550nm = –49dB
Using the AD8067 at Gains of Less Than 8
A common technique used to stabilize decompensated amplifiers is
to increase the noise gain, independent of the signal gain. The
AD8067 can be used for signal gains of less than 8, provided that
proper care is taken to ensure that the noise gain of the amplifier
is set to at least the recommended minimum signal gain of 8
(See Figure 54).
The signal and noise gain equations for a noninverting amplifier
are shown below.
1
3
1
R
R
Gain
Signal
+
=
1
3
1
R
R
Gain
Noise
+
=
Figure 51. Photodiode Preamplifier
Test data for the preamp is shown in Figure 52 and Figure 53.
The addition of resistor
R
2 modifies the noise gain equation, as
shown below. Note the signal gain equation has not changed.
FREQUENCY – MHz
100
65
70
75
80
85
90
95
60
0.01
0.1
1
10
100
2
1
3
1
R
||
R
R
Gain
Noise
+
=
AD8067
C2
0.1
μ
F
1
C1
10
μ
F
+5V
R2
50
C4
0.1
μ
F
C3
10
μ
F
–5V
V
OUT
R
L
R4
51
R3
600
V
IN
5
4
3
2
R1
301
Figure 52. Photodiode Preamplifier Frequency Response
Figure 54. Gain of Less than 2 Schematic
M 50ns CH1 830mV
CH1
500mV
C1 RISE
31.2ns
C1 FALL
31.6ns
T
This technique allows the designer to use the AD8067 in gain
configurations of less than 8. The drawback to this type of
compensation is that the
input noise and offset voltages are also
amplified by the value of the noise gain. In addition, the distortion
performance will be degraded. To avoid excessive overshoot and
ringing when driving a capacitive load, the AD8067 should be
buffered by a small series resistor; in this case, a 51 Ω resistor
was used.
Figure 53. Photodiode Preamplifier Pulse Response
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