參數(shù)資料
型號(hào)： THS4601CDDA
廠(chǎng)商： Texas Instruments, Inc.
英文描述： WIDEBAND, FET-INPUT OPERATIONAL AMPLIFIER
中文描述： 寬帶，場(chǎng)效應(yīng)管輸入運(yùn)算放大器
文件頁(yè)數(shù)： 17/27頁(yè)
文件大?。?/td> 381K
代理商： THS4601CDDA
THS4601
SLOS388B
–
OCTOBER 2001
–
REVISED JUNE 2002
17
www.ti.com
APPLICATION INFORMATION
alternative transimpedance configurations
Other transimpedance configurations are possible. Three possibilities are shown below.
The first configuration is a slight modification of the basic transimpedance circuit. By splitting the feedback
resistor, the feedback capacitor value becomes more manageable and easier to control. This type of
compensation scheme is useful when the feedback capacitor required in the basic configuration becomes so
small that the parasitic effects of the board and components begin to dominate the total feedback capacitance.
By reducing the resistance across the capacitor, the capacitor value can be increased. This mitigates the
dominance of the parasitic effects.
_
+
CF
RF2
RL
RF1
–
VBias
λ
NOTE: Splitting the feedback resistor enables use of a larger, more manageable feedback
capacitor.
Figure 33. Alternative Transimpedance Configuration #1
The second configuration uses a resistive T-network to achieve very high transimpedance gains using relatively
small resistor values. This topology can be very useful when the desired transimpedance gain exceeds the
value of available resistors. The transimpedance gain is given by equation 3.
R
EQ
R
F1
1
R
F2
R
F3
_
+
CF
RF2
RL
RF1
–
VBias
RF3
λ
NOTE: A resistive T-network enables high transimpedance gain with reasonable resistor values.
Figure 34. Alternative Transimpedance Configuration #2
(3)
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