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| 型號： | AB-051 |
| 英文描述： | AB-051 - DOUBLE THE OUTPUT CURRENT TO A LOAD WITH THE DUAL OPA2604 AUDIO OP AMP |
| 中文描述： | 抗體- 051 -雙輸出電流到具有雙音頻運(yùn)算放大器OPA2604負(fù)荷 |
| 文件頁數(shù)： | 2/4頁 |
| 文件大小： | 45K |
| 代理商： | AB-051 |
2
NOISE
OP AMP
=
10 1
+
C
1
C
INT
The three dominate sources of noise at the output of the
switched integrator are the gained op amp noise, the charge
injection noise of the switches and the
KT
/
C
noise of the
integration capacitor. A bode plot of the op amp noise gain
of the switched integrator is shown in Figure 6. The low-
frequency pole of the noise gain is equal to:
This pole is usually found at very low frequencies. For
example, if R
RESET
= 1000G
and C
INT
= 100pF, the pole
would occur at 0.00159Hz.
The zero of the noise gain plot is equal to:
This zero is also usually found at very low frequencies. For
example, if R
= 100M
, C
= 50pF, R
RESET
= 1000G
, and
C
INT
= 100pF, f
Z
would equal 10.6Hz.
As a consequence, the op amp output noise of the switched
integrator is dominated by the high frequency op amp noise
multiplied by:
The total rms noise can be estimated as equal to:
The charge injection noise of the switches and the integra-
tion capacitor noise both have broad band noise equivalent
to 10
μ
Vrms. The total characterized noise of the ACF2101
switched integrator with various input capacitance and inte-
gration capacitance is shown in Figure 6.
1
+
C
1
C
INT
FIGURE 3. Photodiode Model Used in Noise Analysis.
The noise model for the complete photodiode/switched
integrator application is shown in Figure 4. In most applica-
tions the switched integrator is in the integrate mode for
most of the total integration cycle. The model in Figure 4
represents the ACF2101 with the HOLD switch closed and
the RESET switch opened. The typical on-resistance of the
HOLD switch is 1.5k
, and the typical open-resistance of
the RESET switch is 1000G
.
FIGURE 5. Noise Gain of the ACF2101, Switched Integra-
tor.
f
P
=
1
2
π
R
RESET
C
INT
f
Z
=
1
2
π
R
1
|| R
RESET
(
)
C
1
+
C
INT
(
)
FIGURE 4. ACF2101 Switched Integrator and Photodiode
Model Used for Noise Analysis.
V
OUT
C
INT
1/2 ACF2101
Photodiode
R
HOLD
R
RESET
C
1
R
1
High frequency noise gain =
μ
Vrms
C
1
Ideal
Diode
I
IN
R
1
|A|
dB
Open Loop Gain
of Op Amp
P
Noise Gain
Log
Z
C
1
C
INT
1 +
1
2
π
(R
1
|| R
RESET
) (C
1
+ C
INT
)
Z
=
1
2
π
R
RESET
C
INT
P
=
FIGURE 6. Total Output Noise of the ACF2101 Switched
Integrator vs Parasitic Photodiode Capacitance,
C
1
, and the ACF2101 Integration Capacitor,
C
INT
.
0
100
90
80
70
60
50
40
30
20
10
0
C
1
(pF)
100 200 300 400 500 600 700 800 900 1000
T
C
INT
= 100pF
C
INT
= 200pF
C
INT
= 500pF
C
INT
= 1000pF
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