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LOG112 数据表(PDF) 13 Page - Texas Instruments

部件名 LOG112
功能描述  Precision, High-Speed Transimpedance Amplifier
PDF  26 Pages
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制造商  TI2 [Texas Instruments]
网页  https://www.ti.com
标志 TI2 - Texas Instruments

LOG112 数据表(HTML) 13 Page - Texas Instruments

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OPA380
OPA2380
SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007
www.ti.com
13
110
80
50
20
−10
Frequency (Hz)
100
10k
1k
1M
10M
100k
100M
−3dB BW at 1MHz
SeeFigure6a
C
DIODE = 10pF
SeeFigure6c
SeeFigure6b
Figure 7. Transimpedance Gains for Circuits in
Figure 6
The effect of these circuit configurations on output noise
is shown in Figure 8 and on integrated output noise in
Figure 9. A 2-pole Butterworth filter (maximally flat in
passband) is created by selecting the filter values using
the equation:
C
FRF
+ 2C
FILTERRFILTER
with:
f*3dB +
1
2
p R
FRFILTERCFCFILTER
The circuit in Figure 6b rolls off at 20dB/decade. The
circuit with the additional filter shown in Figure 6c rolls
off at 40dB/decade, resulting in improved noise
performance.
300
200
100
0
Frequency (Hz)
C
DIODE = 10pF
SeeFigure6a
See Figure 6b
SeeFigure6c
1100
10
10k
1k
1M
10M
100k
100M
Figure 8. Output Noise for Circuits in Figure 6
500
400
300
200
100
0
Frequency (Hz)
1100
10
10k
1k
1M
10M
100k
100M
419
µV
30
µV
86
µV
C
DIODE = 10pF
See Figure 6a
See Figure 6b
SeeFigure6c
Figure 9. Integrated Output Noise for Circuits in
Figure 6
Figure 10 shows the effect of diode capacitance on
integrated output noise, using the circuit in Figure 6c.
For additional information, refer to Noise Analysis of
FET Transimpedance Amplifiers (SBOA060), and
Noise Analysis for High-Speed Op Amps (SBOA066),
available for download from the TI web site.
80
60
0
20
0
Frequency (Hz)
1
100
10
10k
1k
1M
10M
100k
100M
C
DIODE
= 100pF
C
DIODE
= 10pF
C
DIODE
= 1pF
See Figure 6c
C
DIODE
= 50pF
50
µV
35
µV
30
µV
27
µV
79
µV
C
DIODE
= 20pF
Figure 10. Integrated Output Noise for Various
Values of CDIODE for Circuit in Figure 6c
(4)
(5)



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