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OPA209 Arkusz danych(PDF) 13 Page - Texas Instruments

Numer części OPA209
Szczegółowy opis  OPERATIONAL AMPLIFIER
PDF  25 Pages
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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI - Texas Instruments

OPA209 Arkusz danych(HTML) 13 Page - Texas Instruments

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R
1
R
2
E
O
R
1
R
2
E
O
R
S
V
S
R
S
V
S
A)NoiseinNoninvertingGainConfiguration
B)NoiseinInvertingGainConfiguration
Noiseattheoutput:
E
=
O
2
Wheree = Ö
S
4kTR
S ´
=thermalnoiseofR
S
2
1+
R
2
R
1
e
+e
n
1
2
n
2
S
S
+e
+(i R ) +e
+(i
n
R )
2
2
2
2
2
2
1+
R
2
R
1
R
2
R
1
e = Ö
1
4kTR
1 ´
=thermalnoiseofR
1
2
1+
R
2
R
1
e = Ö
2
2
4kTR
2 =thermalnoiseofR
Noiseattheoutput:
E
=
O
2
Wheree = Ö
S
4kTR
S ´
=thermalnoiseofR
S
2
1+
R
2
R +R
1
S
e
+e
n
1
2
n
2
S
+e
+(i R ) +e
2
2
2
2
2
R
2
R +R
1
S
R
2
R +R
1
S
e = Ö
1
4kTR
1 ´
=thermalnoiseofR
1
e = Ö
2
2
4kTR =thermalnoiseofR
2
OPA209
OPA2209
OPA4209
www.ti.com
SBOS426B – NOVEMBER 2008 – REVISED AUGUST 2010
Figure 34 illustrates both noninverting (Figure 34a)
The feedback resistor values can generally be
and
inverting
(Figure
34b)
op
amp
circuit
chosen to make these noise sources negligible. Note
configurations with gain. In circuit configurations with
that low-impedance feedback resistors load the
gain, the feedback network resistors also contribute
output of the amplifier. The equations for total noise
noise. The current noise of the op amp reacts with
are shown for both configurations.
the feedback resistors to create additional noise
components.
NOTE: For the OPA209 series op amps at 1kHz, en = 2.2nV/√Hz and In = 530fA/√Hz.
Figure 34. Noise Calculation in Gain Configurations
Copyright © 2008–2010, Texas Instruments Incorporated
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Product Folder Link(s): OPA209 OPA2209 OPA4209



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