參數(shù)資料
型號(hào)： AD8067
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)： 20/24頁(yè)
文件大?。?/td> 873K
代理商： AD8067
AD8067
APPLICATIONS
Wideband Photodiode Preamp
Rev. 0 | Page 20 of 24
–
+
V
OUT
V
B
C
F
+ C
S
C
D
C
M
C
M
R
F
AD8067
R
SH
= 10
11
C
S
IPHOTO
C
F
R
F
Figure 49. Wideband Photodiode Preamp
Figure 49 shows an I/V converter with an electrical model of a
photodiode.
The basic transfer function is:
F
F
F
PHOTO
+
1
OUT
V
R
sC
R
I
×
=
where
I
PHOTO
is the output current of the photodiode, and the
parallel combination of
R
F
and
C
F
sets the signal bandwidth.
The stable bandwidth attainable with this preamp is a function of
R
F
, the gain bandwidth product of the amplifier, and the total
capacitance at the amplifier’s summing junction, including
C
S
and
the amplifier input capacitance. R
F
and the total capacitance
produce a pole in the amplifier’s loop transmission that can result
in peaking and instability. Adding
C
F
creates a zero in the loop
transmission that compensates for the pole’s effect and reduces the
signal bandwidth. It can be shown that the signal bandwidth
resulting in a 45° phase margin (
f
(45)) is defined by the expression:
(
)
S
F
45
C
R
π
GBP
×
f
×
=
2
GBP
is the unit gain bandwidth product,
R
F
is the feedback
resistance, and
C
S
is the total capacitance at the amplifier summing
junction (amplifier + photodiode + board parasitics).
The value of
C
F
that produces f(45) can be shown to be:
GBP
R
π
C
C
F
S
F
×
×
=
2
The frequency response in this case will show about 2 dB of
peaking and 15% overshoot. Doubling
C
F
and cutting the
bandwidth in half will result in a flat frequency response, with
about 5% transient overshoot.
The preamp’s output noise over frequency is shown in Figure 50.
Contributor
Expression
RMS
Noise
(μV)
1
R
F
× 2
57
.
1
2
4
2
×
×
×
×
f
R
kT
F
152
Amp to f1
1
f
(
V
noise
×
4.3
Amp (f2–f1)
)
1
2
2
f
–
f
C
C
C
C
C
V
F
D
F
M
S
noise
×
+
+
+
×
96
Amp (Past f2)
(
)
57
.
1
3
2
×
×
+
+
C
+
×
f
C
C
C
C
V
F
D
F
M
S
noise
684
RSS Total
708
Table 2. RMS Noise Contributions of Photodiode Preamp
1
RMS noise with R
F
= 50 k, C
S
= 0.67 pF, C
F
= 0.33 pF,
C
M
= 1.5 pF, and C
D
= 2.5 pF.
FREQUENCY – Hz
V
RF NOISE
f
1
NOISE DUE TO AMPLIFIER
VEN
f
2
1
2
π
R
F
(C
F
+ C
S
+ C
M
+ 2C
D
)
f
1
=
f
2
=
1
2
π
R
F
C
F
f
3
=
GBP
(C
S
+ C
M
+ 2C
D
+ C
F
)/C
F
VEN (C
F
+ C
S
+ C
M
+ 2C
D
)/C
F
f
3
Figure 50. Photodiode Voltage Noise Contributions
Figure 51 shows the AD8067 configured as a transimpedance
photodiode amplifier. The amplifier is used in conjunction with a
JDS Uniphase photodiode detector. This amplifier has a bandwidth
of 9.6 MHz as shown in Figure 52 and is verified by the design
equations shown in Figure 50.
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