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參數資料
| 型號： | 5962F0623701V9A |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運算放大器 |
| 英文描述： | OP-AMP, 500 uV OFFSET-MAX, 7.5 MHz BAND WIDTH, UUC |
| 文件頁數： | 3/16頁 |
| 文件大?。?/td> | 598K |
| 代理商： | 5962F0623701V9A |
RHF43B
Achieving good stability at low gains
Doc ID 13477 Rev 7
11/16
3
Achieving good stability at low gains
At low frequencies, the RHF43B can be used in a low gain configuration as shown in
Figure 23. At lower frequencies, the stability is not affected by the value of the gain, which
can be set close to 1 V/V (0 dB), and is reduced to its simplest expression G1=1+Rfb/Rg.
Therefore, an R-C cell is added in the gain network so that the gain is increased (up to 5) at
higher frequencies (where the stability of the amplifier could be affected). At higher
frequencies, the gain becomes G2=1+Rfb/(Rg//R).
Rg becomes a complex impedance. The closed-loop gain features a variation in frequency
and can be expressed as:
where a pole appears at 1/2
πRC and a zero at G1/2π(G1R+Rfb)C. The frequency can be
plotted as shown in Figure 24.
Figure 23.
Low gain configuration
Figure 24.
Closed-loop gain
Rg
V
CC
Rfb = 2 k
Ω
RL
1 k
Ω
VDD
C
L = 100 pF
Vin
Vout
C
R
+
-
AM06122
Log frequency
Gain
(dB)
+20 dB/dec
-20 dB/dec
G2=1+Rfb/(Rg//R)
G1=1+Rfb//Rg
0 dB
Bandwidth
of the
op-amp at G2
Gain bandwidth
product
G1
2
π(G1R+Rfb)C
1
2πRC
A VD
Frequencies
where the
op-amp can
be used
AM06123
Table 5.
External components versus low-frequency gain
G1 (V/V)
R (
Ω)C (nF)
Rg (
Ω)Rfb (Ω)
1.1
510
1
20k
2k
2510
1
2k
3510
1
1k
2k
4
510
1
750
2.4k
5
Not connected
820
3.3k
Gain
G1
1jC
ω
G1R
Rfb
+
G1
-----------------------------
×
+
1
jCR
ω
+
-------------------------------------------------------------
=
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