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OPA607 Scheda tecnica(PDF) 27 Page - Texas Instruments

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Il numero della parte OPA607
Spiegazioni elettronici  OPA810 140-MHz, Rail-to-Rail Input/Output, FET-Input Operational Amplifier
PDF  50 Pages
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

OPA607 Scheda tecnica(HTML) 27 Page - Texas Instruments

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Frequency (Hz)
-20
-10
0
10
20
30
40
50
60
70
80
90
100
110
120
100
1k
10k
100k
1M
10M
100M
D801
RF = 200 :, RG = 50 :
RF = 10 k:, RG = 2.5 k:
RF = 1 M:, RG = 250 k:
Frequency (Hz)
0
10
20
30
40
50
60
70
80
90
100
100
1k
10k
100k
1M
10M
100M
D802
RF = 200 :, RG = 50 :
RF = 10 k:, RG = 2.5 k:
RF = 1 M:, RG = 250 k:
S
C
F
IN
1
F
2 R C
IN
CM
DIFF
PCB
C
C
C
C
CDIFF
+
±
VIN
RG
VREF
RF
VSIG
VREF
-(RF/RG)VSIG
VO
VS+
VS-
CCM
CCM
CPCB
27
OPA810
www.ti.com
SBOS799A – AUGUST 2019 – REVISED DECEMBER 2019
Product Folder Links: OPA810
Submit Documentation Feedback
Copyright © 2019, Texas Instruments Incorporated
Application Information (continued)
Figure 66. Inverting Amplifier with Input Capacitors
The effective capacitance at the amplifier inverting input pin is shown in Equation 5, which forms a pole in β at a
cut-off frequency of Equation 6.
where
•
CCM is the amplifier common-mode input capacitance
•
CDIFF is the amplifier differential input capacitance
•
CPCB is the PCB parasitic capacitance
(5)
(6)
For low-power systems, greater the values of the feedback resistors, the earlier in frequency does the phase
margin begin to reduce and cause instability. Figure 67 and Figure 68 illustrate the loop gain magnitude and
phase plots, respectively, for the OPA810 simulation in TINA-TI configured as an inverting amplifier with values
of feedback resistors varying by orders of magnitudes.
Figure 67. Loop-Gain vs Frequency for Circuit of Figure 66
Figure 68. Loop-Gain Phase vs Frequency for Circuit of
Figure 66



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