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鍙冩暩(sh霉)璩囨枡
| 鍨嬭櫉(h脿o)锛� | AD823AARMZ-R7 |
| 寤犲晢锛� | Analog Devices Inc |
| 鏂囦欢闋�(y猫)鏁�(sh霉)锛� | 8/20闋�(y猫) |
| 鏂囦欢澶�?銆�?/td> | 0K |
| 鎻忚堪锛� | IC OPAMP JFET RR 17MHZ DL 8MSOP |
| 妯�(bi膩o)婧�(zh菙n)鍖呰锛� | 1,000 |
| 鏀惧ぇ鍣ㄩ鍨嬶細 | J-FET |
| 闆昏矾鏁�(sh霉)锛� | 2 |
| 杓稿嚭椤炲瀷锛� | 婊挎摵骞� |
| 杞�(zhu菐n)鎻涢€熺巼锛� | 35 V/µs |
| -3db甯跺锛� | 19MHz |
| 闆绘祦 - 杓稿叆鍋忓锛� | 1.3pA |
| 闆诲 - 杓稿叆鍋忕Щ锛� | 700µV |
| 闆绘祦 - 闆绘簮锛� | 6.3mA |
| 闆绘祦 - 杓稿嚭 / 閫氶亾锛� | 44mA |
| 闆诲 - 闆绘簮锛屽柈璺�/闆欒矾(±)锛� | 3 V ~ 36 V锛�±1.5 V ~ 18 V |
| 宸ヤ綔婧害锛� | -40°C ~ 85°C |
| 瀹夎椤炲瀷锛� | 琛ㄩ潰璨艰 |
| 灏佽/澶栨锛� | 8-TSSOP锛�8-MSOP锛�0.118"锛�3.00mm 瀵級 |
| 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁濓細 | 8-MSOP |
| 鍖呰锛� | 甯跺嵎 (TR) |
绗�1闋�(y猫)绗�2闋�(y猫)绗�3闋�(y猫)绗�4闋�(y猫)绗�5闋�(y猫)绗�6闋�(y猫)绗�7闋�(y猫)鐣�(d膩ng)鍓嶇8闋�(y猫)绗�9闋�(y猫)绗�10闋�(y猫)绗�11闋�(y猫)绗�12闋�(y猫)绗�13闋�(y猫)绗�14闋�(y猫)绗�15闋�(y猫)绗�16闋�(y猫)绗�17闋�(y猫)绗�18闋�(y猫)绗�19闋�(y猫)绗�20闋�(y猫)
AD823A
Data Sheet
Rev. | Page 16 of 20
WIDEBAND PHOTODIODE PREAMP
鈥�
+
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
+
脳
=
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
蟺
2
1
=
(2)
With the additional pole from the amplifier鈥檚 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
蟺
2
1
=
(3)
Setting the zero at the frequency fx maximizes the signal
bandwidth with a 45掳 phase margin. Since fx is the geometric
mean of fp and fu, it can be calculated by
u
p
x
f
脳
=
(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
脳
=
蟺
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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