tia运放adc设计参考
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CN-0272
Circuits from the Lab™ reference circuits are engineered and
tested for quick and easy system integration to help solve today’s
analog, mixed-signal, and RF design challenges. For more
information and/or support, visit www.analog.com/CN0272.
高性能、145 MHz FASTFET™运算放大器
精密、可选增益、全差分漏斗放大器
12位、20 MSPS、1.8 V ADC
AD8065
AD8475
AD9629-20
ADR441
超低噪声LDO XFET® 2.5 V基准电压源，
具有吸电流和源电流能力
Rev. A
Circuits from the Lab™ circuits from Analog Devices have been designed and built by Analog Devices
engineers. Standard engineering practices have been employed in the design and construction of
each circuit, and their function and performance have been tested and veried in a lab environment at
room temperature. However, you are solely responsible for testing the circuit and determining its
sui
tability and appl
icability for your use and application. Accordingly, in no event shall Analog Devices
be liable for direct, indirect, special, incidental, consequential or punitive damages due to any cause
whatsoever connected to the use of any Circuits from the Lab circuits. (Continued on last page)
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2012 Analo
g Devices, Inc. All rights reserved.
图1. 具有暗电流补偿功能的光电二极管前置放大器系统(原理示意图：未显示所有连接和去耦)
AVDD
C
F
R
F
R
F
0.1µF
0.1µF
3.3pF
V
BIAS
–5V
+1.8V
+0.9V
22pF
AD8065
SFH 2701
AD9629-20
VIN–
VIN+
VCM
INP
INN
VOCM
+2.5V
+OUT
–OUT
AD8475
1kΩ
2.5kΩ
24.9kΩ
24.9kΩ
2.5kΩ
1kΩ
33Ω
33Ω
+5V
–5V
+5V
–5V
TP3
TP2
ADR441
+5V
+2.5V
V
IN
V
OUT
GND
GND
TP1
10599-001
电路笔记
连接/参考器件
具有暗电流补偿功能的2 MHz带宽PIN光电二极管前置放大器
评估和设计支持
电路评估板
CN-0272电路评估板(EVAL-CN0272-SDPZ)
系统演示平台(EVAL-SDP-CB1Z)
设计和集成文件
原理图、布局文件、物料清单
电路功能与优势
图1所示电路是一个高速光电二极管信号调理电路，具有
暗电流补偿功能。系统转换来自高速硅PIN光电二极管的
电流，并驱动20 MSPS模数转换器(ADC)的输入。该器件组
合可提供400 nm至1050 nm的频谱敏感度和49 nA的光电流
敏感度、91 dB的动态范围以及2 MHz的带宽。信号调理电
路采用±5 V电源供电，功耗仅为40 mA，适合便携式高速、
高分辨率光强度应用，如脉搏血氧仪。
本电路还适合其它应用，如模拟光隔离器。它还能满足需
要更高带宽和更低分辨率的应用，如自适应速度控制系
统。
本电路笔记讨论图1中所示电路的优化设计步骤，以满足
特定带宽应用的要求，这些步骤包括：稳定性计算、噪声
分析和器件选择考虑因素。
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