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參數(shù)資料
| 型號： | AD823AARMZ-R7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP JFET RR 17MHZ DL 8MSOP |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 放大器類型： | J-FET |
| 電路數(shù)： | 2 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 35 V/µs |
| -3db帶寬： | 19MHz |
| 電流 - 輸入偏壓： | 1.3pA |
| 電壓 - 輸入偏移： | 700µV |
| 電流 - 電源： | 6.3mA |
| 電流 - 輸出 / 通道： | 44mA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 36 V，±1.5 V ~ 18 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-MSOP |
| 包裝： | 帶卷 (TR) |
AD823A
Data Sheet
Rev. | Page 16 of 20
WIDEBAND PHOTODIODE PREAMP
–
+
VOUT
VB
CD
CM
AD823A
RSH = 10
11
CS
IPHOTO
CF
RF
09439-
055
Figure 42. Wideband Photodiode Preamp
The AD823A is an excellent choice for photodiode preamp
application. Its low input bias current minimizes the DC error
at the preamp output. In addition, its high gain bandwidth
product and low input capacitance maximizes the signal
bandwidth of the photodiode preamp. Figure 42 shows the
AD823A as a current-to-voltage (I/V) converter with an
electrical model of a photodiode.
The transimpedance gain of the photodiode preamp can be
described by the basic transfer function:
F
PHOTO
OUT
R
sC
R
I
V
+
×
=
1
(1)
where IPHOTO is the output current of the photodiode, and the
parallel combination of RF and CF sets the signal bandwidth (see
the I to V gain curve in Figure 43). Note that one should set RF
such that the maximum attainable output voltage corresponds
to the maximum diode current IPHOTO. This allows one to utilize
the full output swing.
The signal bandwidth that is attainable with this preamp is a
function of RF, the gain bandwidth product (fu) of the amplifier,
and the total capacitance at the amplifier summing junction,
including CS and the amplifier input capacitance CD and CM. RF
and the total capacitance produce a pole with loop frequency (fp).
S
F
p
C
R
f
π
2
1
=
(2)
With the additional pole from the amplifier’s open loop
response, the two-pole system results in peaking and instability
due to an insufficient phase margin (Figure 43(A), Without
Compensation).
Adding CF creates a zero in the loop transmission that compensates
for the effect of the input pole. This stabilizes the photodiode
preamp design because of the increased phase margin. It also sets
the signal bandwidth (Figure 43(B), With Compensation). The
signal bandwidth and the zero frequency are determined by
F
z
C
R
f
π
2
1
=
(3)
Setting the zero at the frequency fx maximizes the signal
bandwidth with a 45° phase margin. Since fx is the geometric
mean of fp and fu, it can be calculated by
u
p
x
f
×
=
(4)
Combining Equation 2, Equation 3 and Equation 4, the value of
CF that produces fx is defined by
u
F
S
F
f
R
C
×
=
π
2
(5)
The frequency response in this case shows about 2 dB of
peaking and 15% overshoot. Doubling CF and cutting the
bandwidth in half results in a flat frequency response with
about 5% transient overshoot.
B
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