參數(shù)資料
型號: THS4601CDDA
廠商: TEXAS INSTRUMENTS INC
元件分類: 音頻/視頻放大
英文描述: 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
封裝: GREEN, PLASTIC, SOP-8
文件頁數(shù): 7/34頁
文件大?。?/td> 826K
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
(
)
FEEDBACK CAPACITANCE
(pF)
3 dB FREQUENCY
(MHz)
18
10k
2.2
10.4
18
100k
0.6
3.3
18
1M
0
1.1
47
10k
3.3
7.6
47
100k
0.6
2.8
47
1M
0
0.88
100
10k
3.9
5.9
100
100k
1.5
1.3
100
1M
0
0.62
220
10k
5.6
3.8
220
100k
1.8
1.1
220
1M
0.4
0.36
Figure 29
65
70
75
80
85
90
10 k
100 k
1 M
10 M
100 M
Frequency Hz
T
ransimpedance
Gain
dB
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
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
Frequency Hz
T
ransimpedance
Gain
dB
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
ransimpedance
Gain
dB
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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