參數(shù)資料
型號(hào): THS4601CDDA
廠商: 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): 15/27頁(yè)
文件大?。?/td> 381K
代理商: THS4601CDDA
THS4601
SLOS388B
OCTOBER 2001
REVISED JUNE 2002
15
www.ti.com
APPLICATION INFORMATION
designing the transimpedance circuit (continued)
Table 1. Transimpedance Performance Summary for Various Configurations
SOURCE CAPACITANCE
(pF)
TRANSIMPEDANCE GAIN
(
)
10k
100k
1M
10k
100k
1M
10k
100k
1M
10k
100k
1M
FEEDBACK CAPACITANCE
(pF)
3 dB FREQUENCY
(MHz)
18
18
18
47
47
47
100
100
100
220
220
220
2.2
0.6
0
3.3
0.6
0
3.9
1.5
0
5.6
1.8
0.4
10.4
3.3
1.1
7.6
2.8
0.88
5.9
1.3
0.62
3.8
1.1
0.36
Figure 29
65
70
75
80
85
90
10 k
100 k
1 M
10 M
100 M
Frequency
Hz
T
10 k
TRANSIMPEDANCE BANDWIDTH
FOR VARIOUS SOURCE CAPACITANCES
CS = 18 pF, CF = 2.2 pF
CS = 47 pF,
CF = 3.3 pF
CS = 100 pF,
CF = 3.9 pF
CS = 220 pF,
CF = 5.6 pF
Figure 30
60
65
70
75
80
85
90
95
100
105
10 k
100 k
Frequency
Hz
1 M
10 M
CS = 18 pF,
CF = 0.6 pF
CS = 47 pF,
CF = 0.6 pF
CS = 100 pF,
CF = 1.5 pF
CS = 220 pF,
CF = 1.8 pF
T
100 k
TRANSIMPEDANCE BANDWIDTH
FOR VARIOUS SOURCE CAPACITANCES
Figure 31
90
95
100
105
110
115
120
125
130
10 k
100 k
1 M
10 M
CS = 18 pF, CF = 0
CS = 47 pF,
CF = 0
CS = 100 pF,
CF = 0
CS = 220 pF,
CF = 0.4 pF
Frequency
Hz
T
1 M
TRANSIMPEDANCE BANDWIDTH
FOR VARIOUS SOURCE CAPACITANCES
measuring transimpedance bandwidth
While there is no substitute for measuring the performance of a particular circuit under the exact conditions that
are used in the application, the complete system environment often makes measurements harder. For
transimpedance circuits, it is difficult to measure the frequency response with traditional laboratory equipment
because the circuit requires a current as an input rather than a voltage. Also, the capacitance of the current
source has a direct effect on the frequency response. A simple interface circuit can be used to emulate a
capacitive current source with a network analyzer. With this circuit, transimpedance bandwidth measurements
are simplified, making amplifier evaluation easier and faster.
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