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OP177GS-REEL7 bảng dữ liệu(PDF) 10 Page - Analog Devices

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Giải thích chi tiết về linh kiện  Ultraprecision Operational Amplifier
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OP177
Rev. E | Page 10 of 16
PRECISION HIGH GAIN DIFFERENTIAL AMPLIFIER
The high gain, gain linearity, CMRR, and low TCVOS of the
OP177 make it possible to obtain performance not previously
available in single stage, very high gain amplifier applications.
See Figure 27.
For best CMR,
R2
R1
must equal
R4
R3
In this example, with a 10 mV differential signal, the maximum
errors are listed in Table 6.
0.1µF
+15V
R1
1kΩ
R3
1kΩ
R2
1MΩ
0.1µF
–15V
R4
1MΩ
2
3
7
6
4
OP177
+
Figure 27. Precision High Gain Differential Amplifier
Table 6. High Gain Differential Amp Performance
Type
Amount
Common-Mode Voltage
0.1%/V
Gain Linearity, Worst Case
0.02%
TCVOS
0.0003%/°C
TCIOS
0.008%/°C
ISOLATING LARGE CAPACITIVE LOADS
The circuit shown in Figure 28 reduces maximum slew rate but
allows driving capacitive loads of any size without instability.
Because the 100 Ω resistor is inside the feedback loop, its effect
on output impedance is reduced to insignificance by the high
open loop gain of the OP177.
+
OP177
0.1µF
+15V
RS
RF
0.1µF
–15V
2
3
7
6
4
INPUT
100Ω
10pF
CLOAD
OUTPUT
Figure 28. Isolating Capacitive Loads
BILATERAL CURRENT SOURCE
The current sources shown in Figure 29 supply both positive
and negative currents into a grounded load.
Note that
1
3
2
4
5
1
2
4
5
R
R
R
R
R
R
R
R
Z
O
+
+
=
and that for ZO to be infinite
1
3
2
4
5
R
R
must
R
R
R
=
+
PRECISION ABSOLUTE VALUE AMPLIFIER
The high gain and low TCVOS assure accurate operation with
inputs from microvolts to volts. In this circuit, the signal always
appears as a common-mode signal to the op amps (for details,
see Figure 30).


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