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OPA607 Datenblatt(PDF) 28 Page - Texas Instruments

Teilenummer OPA607
Bauteilbeschribung  OPA810 140MHz, Rail-to-Rail Input and Output, FET-Input Operational Amplifier
PDF  52 Pages
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Hersteller  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
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OPA607 Datenblatt(HTML) 28 Page - Texas Instruments

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the output voltage swing and supply current requirements of the application. The Section 8.1.3 section shows a
detailed analysis of the various contributors to noise.
Frequency (Hz)
-10
0
10
20
30
10k
100k
1M
10M
100M
D806
RF = 200 :, RG = 50 :
RF = 10 k:, RG = 2.5 k:
RF = 1 M:, RG = 250 k:
Figure 8-8. Closed-Loop Gain vs. Frequency for
Circuit of Figure 8-5
Resistance (:)
0.1
1
10
100
1000
10
100
1k
10k
100k
1M
10M
D803
Figure 8-9. Thermal Noise Density vs Resistance
8.1.3 Noise Analysis and the Effect of Resistor Elements on Total Noise
The OPA810 provides a low input-referred broadband noise voltage density of 6.3 nV/√ Hz while requiring a low
3.7-mA quiescent supply current. To take full advantage of this low input noise, careful attention to the other
possible noise contributors is required. Figure 8-10 shows the operational amplifier noise analysis model with all
the noise terms included. In this model, all the noise terms are taken to be noise voltage or current density terms
in nV/√ Hz or pA/√ Hz.
+
±
R
S
E
RS
R
F
R
G
I
BN
E
NI
I
BI
E
O
S
4kTR
G
4kT
R
F
4kTR
4 kT
1.6E
20 J
at 290 K
q
Figure 8-10. Operational Amplifier Noise Analysis Model
The total output spot noise voltage is computed as the square root of the squared contributing terms to the
output noise voltage. This computation adds all the contributing noise powers at the output by superposition,
then calculates the square root to get back to a spot noise voltage. Figure 8-10 shows the general form for this
output noise voltage using the terms shown in Equation 7.
(
)
(
)
(
)
2
2
2
2
O
NI
BN
S
S
F
E
E
I
R
4kTR
NG
I
R
4kTR NG
BI F
=
+
+
+
+
(7)
Dividing this expression by the noise gain (NG = 1 + RF / RG) shows the equivalent input referred spot noise
voltage at the noninverting input; see Equation 8.
OPA810
SBOS799E – AUGUST 2019 – REVISED AUGUST 2024
www.ti.com
28
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Copyright © 2024 Texas Instruments Incorporated
Product Folder Links: OPA810



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